| Seismic Design Criteria for Soil Liquefaction |
JUN 97 |
63 pages |
| Authors:
J. M. Ferritto; NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
|
 | The Navy has numerous bases located in seismically active regions throughout the world. Safe and effective structural design of waterfront facilities requires calculating the expected site specific ground motion and determining the response of these complex structures to the induced loading. The Navy's problem is further complicated by the presence of soft saturated marginal soils which can significantly amplify the levels of seismic shaking and liquefy as evidenced in the ... |
|
| In Situ Seismic Investigation of Liquefaction Potential of Soils |
AUG 96 |
47 pages |
| Authors:
Richard D. Rechtien; MISSOURI UNIV-ROLLA
|
| Liquefaction is a term used to describe a process involving the complete loss of shear strength of loose- to medium-dense sand deposits (or other non-cohesive soils) below the water table during the passage of large- amplitude earthquake waves. The existence of such processes in nature is well evidenced by surface observations at many earthquake sites throughout the world (see, for example, Kawasumi 1968, Seed et al. 1990, and CAEE 1995). ... |
|
| Model Liquid Selection Based on Extreme Values of Liquid State Properties in a Factor Analysis |
MAY 96 |
23 pages |
| Authors:
Wendel J. Shuely; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
|
| Over 50 liquids with extreme values of liquid state properties were identified. The properties were hydrogen bond acceptor and donor strength, polarity, refractive index, density, and molecular weight. These model liquids can be selected for investigation of solvent-solute interactions to provide bold ANOVA experimental designs, orthogonal liquid experimental sets, and minimal co- correlation among experimental data. |
|
| Compilation of Suspended-Load Point-Transport Theories |
OCT 95 |
40 pages |
| Authors:
Thomas G. Drake; Thomas E. White; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
|
| The purpose of this report is to survey the available literature for theories that predict the transport of cohesionless sediments by suspension in the surf zone in combined wave-current nearshore flows under conditions such that quasi-unidirectional currents do not dominate the combined flow. The selected formulae will form a basis for testing theoretical predictions with field measurements of suspended-sediment transport and requisite fluid and sediment quantities at a point within ... |
|
| Geotechnical Factors in the Dredgeability of Sediments; Report 4, Reducing the Impact of Contract Claims |
MAY 95 |
64 pages |
| Authors:
S. J. Spigolon; SJS CORP COOS BAY OR
|
| The major purpose of the Dredging Research Program (DRP) was to reduce. the cost of dredging to a minimum consistent with mission performance and environmental responsibility. One means of accomplishing this mandate is to reduce the impact of contract claims associated with dredging projects. (MM) |
|
| Design Guide for Pile-Driven Plate Anchors |
MAR 95 |
57 pages |
| Authors:
James Forrest; Robert Taylor; Lora Bowman; NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
|
| A user guide is presented for designing and installing plate anchors in the sea bottom using conventional pile driving techniques. This permits use of low cost, highly efficient, mooring anchors to meet a broad range of mooring requirements, including hurricane moorings for ships or other floating structures. This technique is particularly appropriate for heavily congested or confined areas. The anchors are suitable for various bottom deposits, including soft organic silts, ... |
|
| Triaxial and Torsional Shear Test Results for Sand |
JUN 94 |
195 pages |
| Authors:
Bruce L. Kutter; Yie-Ruey Chen; C. K. Shen; CALIFORNIA UNIV DAVIS DEPT OF CIVIL ENGINEERING
|
| This report presents the results of the laboratory tests conducted in triaxial and torsional apparatus. The purposes of this report are not only to support the calibration and verification of the bounding surface hypoplasticity model for granular soil but to provide a valuable data base for future research in numerical model simulation and design. Under this contract, two experiments were carried out: (1) Laboratory samples in the triaxial apparatus and ... |
|
| Stress Wave Propagation in Unsaturated Sands. Volume 1. Centrifuge Modeling |
APR 93 |
134 pages |
| Authors:
Andy J. Walsh; Wayne A. Charlie; COLORADO STATE UNIV FORT COLLINS
|
| Explosive model testing was conducted using a geotechnical centrifuge in order to simulate prototype stresses and ground motions in a representative cohesionless backfill. Models were constructed of sand and compacted moist to a constant void ratio using a vibratory technique. Exploding detonators were used to simulate contained bombs in the backfill material. The objective of this study was to determine the influence of moisture content, at the time of backfill ... |
|
| Experimental Study of Nonassociated Flow and Instability of Frictional Materials. Attachment No. 1 |
APR 93 |
769 pages |
| Authors:
Poul V. Lade; Jerry A. Yamamuro; CALIFORNIA UNIV LOS ANGELES DEPT OF CIVIL ENGINEERING
|
| This study presents the results of an extensive experimental investigation of granular materials at high pressures. Among the many types of experiments performed are drained and undrained triaxial compression and extension tests with an overall confining pressure range of 0.25 to 68.9 MPa. One-dimensional compression tests up to 900 MPa axial stress level were also performed. Major topics that were studied include: strain localization in triaxial extension tests; drained and ... |
|
| Dynamic Response of Reinforced Soil Systems. Volume 2. Appendices |
MAR 93 |
246 pages |
| Authors:
R. C. Bachus; R. J. Fragaszy; M. Jaber; K. L. Olen; Z. Yuan; GEOSYNTEC CONSULTANTS ATLANTA GA
|
| The objective of this study was to investigate the response of reinforced soil systems subjected to blast loading and to assess the feasibility of using reinforced soil to provide blast resistance. To meet this objective, a testing program was developed and executed to accomplish the following: (1) to establish the properties of reinforced soil subjected to blast loading, (2) to develop numerical and physical modeling techniques which are appropriate for ... |
|
| Centrifuge Modeling of Explosion-Induced Craters in Unsaturated Sand |
NOV 92 |
236 pages |
| Authors:
K. C. Brownell; W. A. Charlie; COLORADO STATE UNIV FORT COLLINS
|
| Craters, induced by explosive detonations, were modeled in dry and partially saturated sand in a geotechnical centrifuge. The apparent dimensions of the explosion-induced craters are analyzed as dimensional terms and dimensionless pi terms. Analysis of dimensional terms through a comparison of yield exponents shows that the scaling laws for apparent crater dimensions are the same for dry and partially saturated sand. Analysis of the dimensionless pi terms derived by Schmidt ... |
|
| The Seismic Design of Waterfront Retaining Structures |
NOV 92 |
335 pages |
| Authors:
Robert M. Ebeling; Ernest E. Morrison Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| This technical report deals with the soil mechanics aspects of the design of waterfront retaining structures built to withstand the effects of earthquake loadings. It addresses the stability and movement of gravity retaining walls and anchored sheet pile walls, and the dynamic forces against the walls of drydocks and U-frame locks. The effects of wall displacements, submergence, liquefaction potential, and excess pore water pressures, as well as inertial and hydrodynamic ... |
|
| Settlement Analysis |
30 SEP 1990 |
204 pages |
| Authors:
CORPS OF ENGINEERS WASHINGTON DC
|
| The purpose of this manual is to provide guidelines for calculations of vertical displacements and settlement of soil under shallow foundations supporting various types of structures and under embankments. |
|
| Anisotropic Strength of Cohesionless Sands |
SEP 1981 |
|
| Authors:
Masanobu Oda; NORTHWESTERN UNIV EVANSTON IL DEPT OF CIVIL ENGINEERING
|
 | Natural soil deposits are generally anisotropic as well as heterogeneous. In order to provide a guideline for estimating a reasonable strength parameter applicable to such complex soils, plane strain tests on uniform-anisotropic, uniform-pseudoisotropic, layered-anisotropic, and layered-pseudoisotropic samples have been performed. Anisotropic strength response, caused by the anisotropic distribution of contact normals, should be expected even in a uniform mass of spheres. It is always necessary to assume that sand is ... |
|
| Comprehensive Investigations of Horizontally Loaded Piles in Cohesionless Soils |
JUL 1981 |
|
| Authors:
Yu. M. Kolesnikov; S. V. Kurillo; S. N. Levachev; V. G. Fedorovskii ; UNIDENTIFIED SOURCE
|
| The field of application of existing methods of design of horizontally loaded piles, employing models of an elastic half space or Winkler, is limited to relatively small displacements (10-12 mm at the soil-surface elevation). For large displacements it is necessary to take into account the experimentally determined, nonlinear nature of the relationship between the acting loads and displacements. The most realistic way of deriving a rational nonlinear design analysis is ... |
|
| Dynamic Properties of Soils from In-Situ Tests |
JUL 1981 |
|
| Authors:
Shamsher Prakash; Vijay Kumar Puri; MISSOURI UNIV-ROLLA
|
| Various field test (namely vibration tests on blocks or plates, steady-state vibration or Rayleigh wave tests, wave propagation tests, and cyclic load tests) were conducted at a number of sites in India to determine the dynamic shear modulus, G. Data obtained at different sites are described. The values of G obtained from the different tests at a given site vary widely. The rational approach for selecting the value of G ... |
|
| New Design Correlations for Piles in Sand |
JUL 1981 |
|
| Authors:
Harry M. Coyle; Reno R. Castello; TEXAS A AND M UNIV COLLEGE STATION DEPT OF CIVIL ENGINEERING
|
| A critical review of the literature clearly shows that existing theories which are used to determine the bearing capacity of piles driven in sand are not satisfactory. Careful examination of the results of experimental studies indicates that existing theories fail to consider all significant parameters. Field load test data are used to determine which of the pile geometry and soil property parameters are significant. Special attention is given to the ... |
|
| Comparison of Methods of Size Analysis for Sands of the Amazon-Solimoes Rivers, Brazil and Peru |
FEB 1981 |
|
| Authors:
H. N. Fisk; CINCINNATI UNIV OH
|
| Cumulative frequency curves and bivariate textural plots of sands collected and sieved from the medium-grained (1.94), well-sorted (0.46) Amazon-Solimoes Rivers are not environmentally sensitive. Only 13% of the samples plot as fluvial using cumulative frequency curves, and only one of the nine bivariate plots successfully identified the fluvial environment. Thus, identification of depositional environments of sands by size distribution based only on sieving is not a reliable technique--even when the ... |
|
| State of the Art of Undisturbed Sampling of Cohesionless Soils |
JUN 1980 |
|
| Authors:
William F. Marcuson III; Arley G. Franklin; CORPS OF ENGINEERS VICKSBURG MISS
|
| This report describes the current state of the art in obtaining undisturbed samples of cohesionless material primarily as it is reflected in the experience of the Waterways Experiment Station (WES) and of others on the North American continent. The report discusses general considerations in planning an undisturbed sampling program; methods of access to the soil materials for sampling, testing, or observation; and methods of sampling cohesionless soil. Methods of access ... |
|
| Morphologic Dating of Degraded Normal Fault Scarps |
MAY 1980 |
|
| Authors:
David B. Nash; CINCINNATI UNIV OH
|
| Recent studies of scarps produced by normal faulting of cohesionless materials indicate that older scarps are steeper than younger ones, and that slope angles are less for lower scarps of the same age. These observations may be explained by a simple quantitative model of slope degradation in which the rate of change of elevation at a point on a slope profile is proportional to the curvature of the profile at ... |
|
| Cyclic Shear Resistance of Noncohesive Soils |
JAN 1980 |
|
| Authors:
Edward G. Prater; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| The cyclic shear resistance of anisotropically consolidated soil is examined with the aid of stress path vectors in a p-q stress diagram. It is shown that the current definition of full or 100% pore-pressure ratio is adequate only for conditions of isotropic consolidation. This is illustrated with an example for a loose horizontal sand deposit. The behavior of a compact gravel is considered with reference to some cyclic triaxial test ... |
|
| Investigation of Cohesionless Soils in a Triaxial Apparatus With an Optical Strain Measurement System |
NOV 1979 |
|
| Authors:
V. S. Khristoforov; V. N. Karaganov; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| The improved triaxial apparatus with an optical strain measurement system can be recommended for practical use when determining the characteristics of soils with Lode parameter nu sigma = + or - 1. In the pressure range of interest for deep suports the relations which permit taking into account the nonlinearity of the characteristics of cohesionless soils do not agree satisfactorily with the experimental data and require refinement with consideration of ... |
|
| Physical Aspects of Raindrop Erosion |
NOV 1979 |
|
| Authors:
V. M. Moskovkin; V. F. gakhov; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
|
| Suggested Method for the Calibration of Vibrating Tables for Maximum Index Density Testing |
SEP 1979 |
|
| Authors:
L. P. Kaufman; E. A. Strickland; A. A. Benavidez; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| The amplitude of vibration of the vibrating table used in the ASTM Test for Relative Density of Cohesionless Soils has a significant effect on the value of the maximum index dry density obtained for a particular soil specimen. The table vibration must be calibrated to help ensure conformance with a standard test method. A method for this calibration is given and the required apparatus is described. The results of a ... |
|
| Modulus of Elasticity of Sandy Soils by Sounding Methods |
JUL 1979 |
|
| Authors:
T. K. Natarajan; D. S. Tolia; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| CONSIDERABLE INFORMATION HAS ALREADY BEEN PUBLISHED RELATING THE STANDARD PENETRATION TESTS (SPT) and the static cone resistance (q sub c) values with several soil parameters. However, there had been no systematic investigation on the link between the number of blows (N), the static cone resistance (q sub c) and the modulus of elasticity (E) of sandy soils at various depths. On the basis of recent investigations, an attempt has been ... |
|
| Reinforcing of a Non-Cohesive Soil by Granular Piles |
JUL 1979 |
|
| Authors:
B. G. Rao; R. K. Bhandari; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| The paper reports a field study on the stress-deformation behaviour of a loose-to-medium, non-cohesive, soil deposit reinforced with granular piles. Benefits of reinforcement are determined by in situ load testing of soil-granular pile systems having piles cast singly or in groups of two, three and four; and comparing the results with those relating to the ground without granular piles. The field study is extended to examine and quantify the added ... |
|
| Analysis for Bearing Capacity of Cohesionless Soils |
JUL 1979 |
|
| Authors:
R. C. Sonpal; K. R. Shah; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| Limit equilibrium theories on assumed surfaces not obtainable statically as well as kinematically do not lead to appropriate solutions in evaluating bearing capacity of foundations. The present study consists of a field testing program of plate load tests with square, circular and rectangular plates on sandy deposits. Ultimate bearing capacities evaluated from plate load tests have been observed extremely high compared to conventional theories. A new approach for analysis of ... |
|
| Locked Sands |
1979 |
|
| Authors:
M. B. Dusseault; N. R. Morgenstern; ALBERTA UNIV EDMONTON DEPT OF CIVIL ENGINEERING*
|
| A new group of engineering materials, called locked sands, has been identified and described. The criteria which differentiate locked sands from dense sands and sandstones are: absence of cohesion, highly quartzose mineralogy, high strength, steeply curved failure envelopes, low porosities, and considerable geological age. Locked sands are also characterized by a lack of interstitial cement, brittle behaviour, residual shear strengths of 30 deg-35 deg, and exceptionally large dilation rates at ... |
|
| Vibrations Associated with Pile Driving |
DEC 1978 |
|
| Authors:
William S. Heckman; Joseph Hagerty; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| The developed prediction equation relating peak particle velocity and scaled energy can be used to predict expected maximum levels of vibrations from pile driving. Peak particle velocity can be utilized as a criterion for safe levels of vibration. Vibration levels can be reduced by various means such as pre-coring, or selection of low-displacement piles. However, reducing transmitted vibrations by reducing hammer energy may be an unwise solution. Increasing pile impedance ... |
|
| Tapered Piles in Cohesionless Soils |
DEC 1978 |
|
| Authors:
A. N. R. Char; INDIAN INST OF TECH KANPUR
|
| Owing to its generality and accessibility, the finite differences method constitutes a particularly useful and efficient computing instrument. The method is used for the analysis of tapered piles subjected to lateral loads. Unlike in the case of vertical loads information is rather scarce about the behaviour of tapered piles under lateral loads. The comparative behaviour of tapered piles is examined by the elastic continuum method in this paper. For purely ... |
|
| Effect of Rigid Layer on Behaviour of Strip by FEM |
DEC 1978 |
|
| Authors:
B. S. Khadilkar; M. V. Patankar; INDIAN INST OF TECH KANPUR
|
| Problem of strip footing resting on cohesionless soil is attempted by finite element method. Nonlinear behaviour of soil and incremental method are used. Stress deformation study for a single strip footing for different locations of the rigid layer is made wherein flexibility of the footing, smooth and rough interface of rigid layer are also examined. The paper deals with contact stresses, deformation characteristics of footing, continuum stresses, settlements, etc. Data ... |
|
| Effects of Stress History on Deformation of Sand |
NOV 1978 |
|
| Authors:
James R. Lambrechts; Gerald A. Leonards; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| The prestraining induced by prestressing, without residual lateral stresses, was found to increase the deformation resistance to incrementally applied axial load by an order of magnitude. The stress level at which a prestressed sample's load-deformation behavior changed from the stiffer, essentially elastic reloading mode to that which was predominantly plastic and resembled the normally consolidated state depended upon the magnitude of the prestress (or prestrain). The relationship between initial modulus ... |
|
| Bearing Capacity of Anisotropic Cohesionless Soils |
NOV 1978 |
|
| Authors:
G. G. Meyerhof; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF BUILDING RESEARCH
|
| Previous test results of the anisotropic shear strength of cohesionless soils are reviewed. The theory of the ultimate bearing capacity of shallow foundations on homogeneous isotropic soils is extended to anisotropic cohesionless soils. The proposed method of analysis is compared with the results of some load tests on anisotropic sand. An extension of this method to foundations under inclined load is briefly discussed. (AA) |
|
| Seismic Response of Frozen Ground |
OCT 1978 |
|
| Authors:
W. D. Liam Finn; Raymond N. Yong; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| Field data on the behavior of frozen ground during the Alaska earthquake of 1964 are reviewed. It is shown that fully frozen ground behaves well during earthquakes and that most engineering problems are encountered in frozen ground when saturated cohesionless soils are trapped beneath the frozen surface layer. A procedure for the dynamic effective stress response analysis of this case is presented. Existing data on stress-strain properties of frozen ground ... |
|
| Liquefaction of Thawed Layers in Frozen Soils |
OCT 1978 |
|
| Authors:
W. D. Liam Finn; Raymond N. Yong; Kwok W. Lee; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| A dynamic effective stress method is presented for assessing the liquefaction potential of thawed layers of saturated cohesionless soils sealed between frozen surface layers and permafrost. Such layers are common in Arctic regions. Analysis indicates that the liquefaction potential is increased by the presence of a frozen surface layer. The pore-water pressures created by dynamic stress gradients are redistributed upwards to regions of lower effective stresses and they cannot dissipate ... |
|
| Erosion Control of Granular Soils Using PVA |
SEP 1978 |
|
| Authors:
Robert M. Koerner; Thomas A. Okrasinski; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| One of a number of methods used to arrest soil erosion is by chemical means. Within this category is polyvinyl alcohol (PVA), a commercially available polymer. When applied to a highly erodable granular soil in the amount of 48g/sq m (400 lb/acre) erosion was resisted during a 120 min duration rainfall of an intensity of 3.8 cm/hr (1.5 in/hr). Subsequent laboratory tests showed that the mechanism involved in the success ... |
|
| A Multilevel Device for Ground-Water Sampling and Piezometric Monitoring |
SEP 1978 |
|
| Authors:
J. F. Pickens; J. A. Cherry; G. E. Grisak; W. F. Merritt; B. A. Risto; WATERLOO UNIV (ONTARIO) DEPT OF EARTH SCIENCES*
|
| A simple inexpensive device for sample collection and for monitoring of ground-water potential at many levels from a single borehole installation has been developed. The device consists of a bundle of polypropylene tubes contained inside a polyvinyl chloride (PVC) pipe that is installed in the aquifer. Each tube protrudes through the wall of the pipe at a different elevation where it serves as a point water sampler and piezometer. The ... |
|
| Transport of a Noncohesive Sandy Mixture in Rainfall and Runoff Experiments |
SEP 1978 |
|
| Authors:
P. H. Walker; P. I. A. Kinnell; Patricia Green; COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANIZATION ADELAIDE (AUSTRALIA) DIV OF SOILS
|
| Rainfall intensities of 45, 100, and 150 mm/hr with systematically varied kinetic energies were applied to a saturated noncohesive, sandy bed 3 m long and set at slopes of 0.5 and 5%. Detailed size analyses of solids discharged showed that the 4-mm fraction behaved as a lag gravel. The sedimentary properties of bed deposits also reflected the differentiation of various size fraction and minerals in the original mixture. The effects ... |
|
| A Consideration About Rowe's Minimum Energy Ratio Principle and a New Conceptof Shear Mechanism |
MAR 1978 |
|
| Authors:
Toshihide Tokue; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| Rowe introduced a new concept called minimum energy ratio principle to get a stress-dilatancy relation of granular materials under axisymmetric stress condition. According to the principle, the sliding contacts are restricted to those with the preferred angle Beta sub c = (Pi/4)-(Phi sub mu/2). However, the physical basis of this principle is questioned by many investigators. In this paper, the author investigates this principle only on the basis of equilibrium ... |
|
| Wave-Induced Pore Pressure in Relation to Ocean Floor Stability of Cohesionless Soils |
1978 |
|
| Authors:
H. Bolton Seed; M. S. Rahman; CALIFORNIA UNIV BERKELEY DEPT OF CIVIL ENGINEERING
|
| One of the important geotechnical considerations for many engineerng installations, such as pipelines and anchors, in an oceanic environment involving sand deposits is that of potential ocean floor instability due to the development of high pore pressures caused by the direct action of waves. This article presents a procedure for evaluating the magnitude and distribution of wave-induced pore pressures in ocean floor deposits. The method takes into account the distribution ... |
|
| Application of an Experimentally Based Non-Linear Constitutive Model of Soils in Laboratory and Field Tests |
1978 |
|
| Authors:
B. G. Richards; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| There are difficulties in adapting many currently available constitutive models to fit the experimentally determined non-linear behaviour of soils. However, one such model, the Modified Variable Moduli Model, has been found to be a simple and convenient method for predicting the behaviour of two non-cohesive soils and an unsaturated expansive clay in practical applications. Recent work on these applications is reviewed. Whereas the parameters for the non-cohesive materials can be ... |
|
| Estimating Bearing Capacity in Sand from SPT Values |
SEP 1977 |
|
| Authors:
Richard H. G. Parry; CAMBRIDGE UNIV (ENGLAND) DEPT OF ENGINEERING
|
| No abstract |
|
| Large Scale Dynamic Test of In Situ Reinforced Earth |
SEP 1977 |
|
| Authors:
Gunter Gassler; KARLSRUHE UNIV (GERMANY F R)
|
| The question posed at the very beginning can definitely be answered: There is no failure - not even stepwise failure - of the nailed retaining wall under dynamic traffic load. For dimensioning nailed retaining walls there will be no additional safety factor introduced for dynamic traffic loads. (AA) |
|
| Shear Strength of Granular Materials, |
AUG 1977 |
|
| Authors:
Sekanoor K. Sadasivan; Vegesna S. Raju
|
| Based on statistical methods, a theory has been proposed for the shear strength of a random assembly of spherical cohesionless particles. The theoretical analysis gives a relationship between angle of internal friction phi cv at constant volume, interparticle friction angle phi micron, and void ratio e. For comparison, drained triaxial compression tests have been carried out on steel spheres, uniform sands, and glass ballotini of different sizes. When phi micron ... |
|
| Co-ordination Number and its Relation to Shear Strength of Granular Material |
JUN 1977 |
|
| Authors:
Masanobu Oda; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| Co-ordination number in the assemblies of glass balls was analyzed to make it clear the mechanism of random arrangement of consiituent particles and its relation to their shear strength. The conclusions are summarized as follows: The frequency distribution of co-ordination number is generally represented by the Gaussian in the random-homogeneous assembly. The Gaussian is never found in the assembly mixed by particles having different diameters. Not only the mean value ... |
|
| Stability of a Shallow Circular Tunnel in Cohesionless Soil |
JUN 1977 |
|
| Authors:
J. H. Atkinson; D. M. Potts; UNIVERSITY COLL CARDIFF (WALES) DEPT OF CIVIL ENGINEERING*
|
|
| Model Tests on Anchored Walls Retaining Overconsolidated Sands, |
MAY 1977 |
|
| Authors:
W. F. Anderson; T. H. Hanna
|
| This paper reports the findings of two series of tests which are part of a continuing study into the behavior of laboratory scale anchored retaining walls supporting cohesionless soil. In each test, field construction was simulated and the behavior of the wall, anchors, and soil was monitored. The behavior of a wall supported by horizontal anchors has been examined as the overconsolidation ratio of the retained sand increases. The effect ... |
|
| Shear Zones in Granular Material |
MAR 1977 |
|
| Authors:
G. Mandl; L. N. J. de Jong; A. Maltha; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
|
| A special ring-shear apparatus was designed to study in granular materials under continued shearing the development of shear zones and the accompanying changes in texture and stress state. Various series of experiments were run with densely packed, cohesionless materials in both dry and fluid-saturated states. For comparison, in a few tests also moderately cohesive materials were used. Materials and vertical load were chosen to either allow or suppress shear dilatancy, ... |
|
| Stability of a Shallow Circular Tunnel in Cohesionless Soil, |
1977 |
|
| Authors:
J. H. Atkinson; D. M. Potts
|
| This paper investigates theoretically and experimentally the stability of a circular tunnel in a cohesionless soil with support conditions similar to those found during construction. The experimental investigation consisted of small-scale model tests in the laboratory and on the Cambridge University large-diametercentrifuge. All the model tests were carried out in plane strain using Leighton Buzzard sand and tests with and without surcharge loading are reported. The theoretical studies are based ... |
|
| Influence of Soil Aggregation on Slope Stability in the Oregon Coast Ranges |
1977 |
|
| Authors:
Carlton S. Yee; R. Dennis Harr; OREGON STATE UNIV CORVALLIS
|
| Two major cohesionless soil series of the central Coast Ranges of Oregon were examined for soil and hydrologic properties. Although derived from different parent material, the Bohannon and Klickitat series exhibited nearly identical values of soil and hydrologic properties. Aggregation in both soils was found to be the most important property, for it influences shear strength and subsurface water movement, prime components of slope stability. The unusually high angle of ... |
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Reports by Keyword(s)
COHESIONLESS SOILS
