Axisymmetric Strain-Path and Stress-Path Tests on CARES-Dry Clayey Sand
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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This report documents results of laboratory tests in which the responses of remolded and undisturbed specimens of CARES-Dry clayey sand were measured under controlled strain-path and stress-path loadings. The strain-path investigation measured the response of the CARES material when subjected to 1 two strain-path shapes designated SP2 and SP3 with three levels of peak strain designated A, B, and C, 2 two strain-path shapes, 3 reverse strain-path tests, 4 one strain path SP3B conducted at several different strain rates, and 5 one strain path SP3B conducted at four different levels of initial prestress. Stress-path tests were conducted to attempt to characterize the hardening response of the CARES material under several load-unload-reload cycles with each cycle extending into the compression and extension regime of stress space. Test results proved that, in all ot he strain-path tests conducted on remolded specimens, a unique stresspath was produced by following a given strain path at a single strain rate. However, because of the inherent nonhomogeneity of the undisturbed specimens, significant variability was observed in the test data. Specimens and th followed the SP3 strain path reached a point of continuing strain with little change in principal stress difference or mean normal stress during this time the stress paths were in the proximity of the failure envelope.
- Soil Mechanics