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ADVANCED EARTH SCIENCES - FOOTHILL SANITARY LANDFILL <br />MULTI -INTERFACE DIRECT SHEAR TESTING (ASTM D 6243) <br />Upper Shear Box: Operation layer soil nominally compacted against <br />Wetted GSE 300E double sided geocomposite 4131465743 with outside (net strands parallel to MD) down against <br />Wetted GSE 60 -mil B/B textured HDPE geomembrane (4108181768, upper surface wetted by spraying water) against <br />Bentoliner NWL45 GCL (Roll #502252376, peel = 55 lbs, upper surface wetted by spraying water) with heat -burnished side down against <br />Lower Shear Box: subgrade soil compacted to approximately 90% of max dry density at OMC + 4% ( Ydna, = 98.5 pcf, OMC = 23.0%) <br />8000 <br />7000 <br />6000 <br />c <br />c 5000 <br />L 4000 <br />zn <br />L <br />C6 <br />3000 <br />2000 <br />1000 <br />0 <br />0.0 <br />—5A —5B —5C —513 —5E <br />0.8 1.6 2.4 3.2 <br />Displacement (in.) <br />15000 <br />12000 <br />Shear Strength <br />Parameters (2) <br />S <br />(deg) <br />a <br />(psf) <br />R <br />Peak <br />23 <br />355 <br />0.995 <br />LD <br />10 <br />330 <br />0.977 <br />c <br />c O Peak <br />s 9000 ❑ LD <br />- Linear (Peak) <br />L -Linear (LD) <br />in <br />6000 <br />Y <br />t <br />Cn <br />3000 <br />0+ <br />0 <br />3000 6000 9000 12000 15000 <br />Normal stress (psf) <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 />Soaking in Distilled Water <br />Stress Time <br />s hour <br />Consolidation Operation Layer Soil <br />Stress Time Yd I W (Of <br />s hour c %% <br />Yd <br />c <br />Sub rade Soil <br />wi Of <br />% % <br />GCL <br />w Of <br />% % <br />Shear Strength <br />'CP TCD <br />s s <br />Failure <br />Mode <br />A <br />12 x 12 <br />1000 <br />0.04 <br />125 20 <br />1000 <br />16 <br />88.6 <br />27.1 <br />104.0 <br />625 365 <br />5B <br />12 x 12 <br />4000 <br />0.04 <br />125 20 <br />4000 <br />16 <br />88.4 <br />27.4 <br />81.7 <br />2127 1135 <br />(1) <br />5C <br />12 x 12 <br />6000 <br />0.04 <br />125 20 <br />6000 <br />16 <br />88.8 <br />26.8 <br />72.4 <br />2968 1465 <br />(1) <br />5D <br />12 x 12 <br />8000 <br />0.04 <br />125 20 <br />8000 <br />16 <br />88.7 <br />26.9 <br />67.4 <br />3742 1696 <br />(1) <br />5E <br />12 x 12 <br />12000 <br />0.04 <br />125 20 <br />12000 <br />16 <br />88.4 <br />27.3 <br />53.9 <br />5270 2322 <br />(1) <br />NOTES: <br />(1) ) Sliding (shear failure) occurred at the interface between the geocomposite and textured geomembrane. <br />(2) The reported total -stress parameters of friction angle and adhesion were detennined from a best -fit line drawn through the test data. Caution should be exercised in using these strength parameters for <br />applications involving normal stresses outside the range of the stresses covered by the test series. The large -displacement (LD) shear strength was calculated using the shear force measured at the end of the test. <br />514010-37.ds.xls <br />DATE OF REPORT: <br />NO. <br />7/11/2015 <br />B-5 <br />