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ADVANCED EARTH SCIENCES - FOOTHILL SANITARY LANDFILL <br />SINGLE INTERFACE DIRECT SHEAR TESTING (ASTM D 6243) <br />Upper Shear Box: Concrete sand <br />Bentoliner NWL45 GCL (Lot 25051311, Roll #502252383, peel = 53.6 lbs, lower surface wetted by spraying) with non heat -burnished side down against <br />GSE 60 -mil B/B textured HDPE geomembrane (#108181768, upper surface wetted by spraying) <br />Lower Shear Box: Concrete sand <br />9000 I 15000 <br />7500 <br />6000 <br />y <br />y <br />4500 <br />L <br />C4 <br />s <br />In 3000 <br />1500 <br />0 <br />0.0 <br />0.8 1.6 2.4 3.2 <br />Displacement (in.) <br />12000 <br />fi <br />6000 <br />3000 <br />0 <br />S <br />Parameters(3) (deg) <br />(psi <br />Peak <br />Shear <br />Rate <br />in./min <br />LD <br />Shear Strength <br />GCL <br />wi Of <br />% % <br />a <br />Rz <br />2 <br />x <br />1 <br />20 <br />16 <br />2B <br />12 x 12 <br />4000 <br />0.04 <br />125 20 <br />4000 <br />16 <br />82.5 <br />2395 1625 <br />O Peak [3 LD <br />2C <br />12 x 12 <br />6000 <br />0.04 <br />125 20 <br />6000 <br />O <br />79.3 <br />O <br />2D <br />O <br />8000 <br />0.04 <br />O <br />❑ <br />16 <br />❑ <br />® <br />) <br />❑ <br />12 x 12 <br />12000 <br />0.04 <br />125 20 <br />S <br />Parameters(3) (deg) <br />(psi <br />Peak <br />Shear <br />Rate <br />in./min <br />LD <br />Consolidation in Water Lower Soil Foundation Soil <br />Stress Time Yd mi wf Yd wi wf <br />s our c % % c % % <br />0 3000 6000 9000 12000 15000 <br />Normal stress (psi) <br />Test <br />No. <br />Shear <br />Box Size <br />in. x in. <br />Normal <br />Stress <br />s <br />Shear <br />Rate <br />in./min <br />GCL Soaking in Water <br />Stress Time <br />s hour <br />Consolidation in Water Lower Soil Foundation Soil <br />Stress Time Yd mi wf Yd wi wf <br />s our c % % c % % <br />GCL <br />wi Of <br />% % <br />Shear Strength <br />Tp rLD <br />s s <br />Failure <br />Mode <br />2 <br />x <br />1 <br />20 <br />16 <br />2B <br />12 x 12 <br />4000 <br />0.04 <br />125 20 <br />4000 <br />16 <br />82.5 <br />2395 1625 <br />(1) <br />2C <br />12 x 12 <br />6000 <br />0.04 <br />125 20 <br />6000 <br />16 <br />79.3 <br />3489 1977 <br />2D <br />12 x 12 <br />8000 <br />0.04 <br />125 20 <br />8000 <br />16 <br />68.6 <br />4506 2355 <br />) <br />2E <br />12 x 12 <br />12000 <br />0.04 <br />125 20 <br />12000 <br />16 <br />56.7 <br />5670 1609 <br />( ) <br />NOTES: <br />(1) Sliding (shear failure) occurred at the interface between the non heat- treated side of GCL and geomembrane. <br />(2) GCL internal failure. <br />(3) A straight line shear strength envelope not drawn through the test data because the interface shear failure occurred at 1000, 4000, 6000, and 8000 psf while GCL internal shear failure at 12000 psf. <br />DATE OF REPORT: 6/12/2015 <br />FIGURE NO. B-2 <br />