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-17- <br />fV <br />~Triaxial Compressive Strength <br />Consolidated undrained triaxial compression tests with pore pressure <br />measurements (TX-CU/PP) were performed on relatively undisturbed samples of the <br />colluvial clays which will underlie the pile. The tests were performed to <br />evaluate the shear strength parameters of these materials for comparison with <br />the shear strength parameters assumed in our previous analyses. The tests were <br />run with varying conifining pressures to simulate the range of confining <br />stresses which might arise in the foundation beneath the waste rock pile. The <br />samples were saturated and consolidated at the assigned confining pressure prior <br />to testing. Measurement of pore pressures during testing enables effective as <br />well as total stress parameters to be calculated. Test results are presented on <br />Plate A-B. <br />Unconfined Compressive Strength <br />These tests provide a direct measure of the uniaxial strength of the soil. <br />This value can be correlated with shear strength to give a rapid estimate of <br />parameters for some types of stability analyses. Compressive strength test <br />results are presented on Plate A-9. <br />Permeability Tests <br />Permeability tests on "undisturbed" samples from selected locations give a <br />measure of the permeability of specific soil types encountered. They also enable <br />comparison with the results of field (falling head) permeability tests. Results <br />of tests performed on 2-inch diameter "undisturbed" samples using the falling <br />head method are presented below. <br />BORING DEPTH (FT.) <br />1 49 <br />3 9 <br />MATERIAL <br />TYPE PERMEABILITY (CM/SEC) <br />Silty Clay 9.1 x 10-g <br />Silty Clay 4.7 x 10-7 <br />c[aNroao coKw~mw. n+c. <br />