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<br />MATERIALS TESTING SERVICE <br /> <br />summary of the soil properties is attached as Figures 12-18. <br /> <br />Strength properties of select~d sections of the overburden <br />soils have been. investigated through triaxial shear test <br />procedures. That sata is attacped as Triaxial Shear test <br />results in Figures 19 and 20. <br /> <br />TRIAXIAL SHEAR TESTS: <br /> <br /> <br />The~triaxialT-te st'.'~.specimen:s~'were"ITIa:de-,",up 'eto -an. 'equi va lent"..' <br /> <br /> <br />density;' as determined-by - measuri,ng ~-the - volum6=aIld~.weight-,oi' <br /> <br /> <br />the--samples~retrievecr---in the~spoon- sampler. 'Moisture deter- <br /> <br /> <br />minations were used to duplicate as many conditions as possible. <br /> <br />A triaxial compression test is the only real shear strength <br /> <br /> <br />test which can - be applied to material similar to that which <br /> <br /> <br />constitutes the dams central core. The test is primarily to <br /> <br /> <br />evaluate the. cohesion of the soil (c) and the angle of shear- <br /> <br /> <br />ing resistance-(~) of a soil as defined by the Coulomb-Mohr <br /> <br /> <br />equation. <br /> <br />In this study;~--the-quick-undrained test -was employed to <br />simulate the conditions found prevalent at the water retention <br />structure. In the undrained test, the specimen is not allowed <br />to drain during the application of the all-round pressure ( 3) <br />or during the application:-Oxthe.axial stress, and therefore, <br /> <br />. . <br />thepore_pressurepis not allowed to dissipate at any -stage-of <br /> <br />ENGINEERS <br /> <br />-6- <br />