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Test <br />Series <br />Number <br />Interface Tested <br />Normal <br />Sires <br />(psl) <br />Peak Strength <br />Residual Strength <br />Friction <br />Angle <br />Adhesion <br />(p <br />R <br />Friction <br />Angle <br />Adhesion <br />(p <br />R = <br />1 <br />Wetted Crushed Rock Overllner /80 -mil <br />VIOPE Geomembrane /Iron Clad Tailings <br />Gundle <br />Smooth 50 to 300 <br />28' <br />1,635 <br />0.997 <br />28' <br />1,635 <br />0.997 <br />Notes: nr <br />RI <br />PI <br />G1.345B/GEL93234 <br />()LE 4 <br />INTERFACE DIRECT SHEAR TEST RESULTS <br />MEASURED TOTAL STRESS SHEAR STRENGTH PARAMETERS <br />GOLDER ASSOCIATES, INC. <br />GOLDER PROJECT NUMBER 933 - 2442.9 <br />For the test series, the overltner and the upper surface of the geomembrane were wetted by pouring tap water on top of the overltner specimen and allowint <br />the water to drain at the overliner - geomembrane interface; there was no predetermined failure surface defined at the onset of testing, shear failure was <br />observed to occur at the wetted crushed rock overltner- geomembrane interface. <br />For the 50, 100, and 150 psi tests, a 12-In. by 12-In. (300-mm by 300 -mm) shear box was used and the 300 psi test was conducted In a 6 -In. by 6 -in. (150 -nn <br />by 150 shear box. Each test specimen was sheared tmnediately after application of the normal stress. <br />The reported value of adhesion may not be the "true adhesion" of the interface and caution should be exercised In using this adhesion value for applications <br />involving normal stresses outside the range of stresses covered by the test series. <br />93.09.2r <br />