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Abstract:
A high-pressure low-temperature triaxial compression testing system with on specimen axial strain measurements and lubricated end plattens was developed in order to measure the stress-strain-volume change behavior of frozen Manchester Fine Sand (MFS) from very small (0.01%) to very large (25%) axial strains. The main testing program was conducted at a temperature of T=-9.5 deg C and varied the relative density from 20 to 100%, the confining pressure from 0.1 to 10 MPa, and the strain rate from 0.000003/sec (slow) to 0.0004/sec (fast). These data show a constant Young's modulus that can be explained in terms of a composite materials model; provide the first detailed evaluation of the upper yield stress, which is essentially independent of sand density and confining pressure, and has a rate sensitivity similar to that of granular ice; and show that the peak strength generally increases linearly with sand density, increases nonlinearly with confinement, and has a rate sensitivity much less than granular ice. Initial tests at different temperatures indicate a larger temperature sensitivity than predicted for granular ice. A similar triaxial system was used to measure the stress-strain behavior of unfrozen MFS as a function of relative density and confining pressure. These data are used to evaluate Ladanyi's dilatancy-hardening model developed to predict the strength of frozen sand. Cold regions, confining pressure, deformation, dilatancy, frozen soil, modulus, sand, shear strength, strain rate, temperature, triaxial tests, yield stress.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. Jan 89-Dec 91 |
| Pages: |
166 |
| Report Date: |
APR 92 |
| Contract Number: |
DAAL03-89-K-0023 |
| Report Number: |
A309352 |
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