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INTERFACE DIRECT SHEAR TESTING (ASTM D 6243) <br />Test Series 1: Bentomat DN GCL (Roll No. 1353) against textured side of 80 -mil GSE smooth -textured HDPE geomembrane (Roll No. 4710) under soaked and <br />consolidated conditiog5 <br />12000 <br />10000 <br />8000 <br />a <br />d <br />U <br />6000 <br />R <br />d <br />v' 4000 <br />2000 <br />0 <br />0.0 <br />-0- 1 A <br />-C- 1B <br />-es 1C <br />-0-- ID <br />0.5 1.0 1.5 2.0 2.5 3.0 <br />Displacement (in.) <br />LUU <br />Shear Strength 8/0 c/a R2 <br />175 Parameters (deg) (pst) <br />Peak 23 120 0.999 <br />LD 14 330 0.999 <br />150 <br />O Peal: <br />Q 125 ❑ LD <br />H - Linear (Peak) <br />i [00 "- Linear (LD) <br />L <br />R <br />s 75 <br />rn <br />50 <br />25 <br />0 <br />0 25 50 75 100 125 150 175 200 <br />Normal stress (psi) <br />Test <br />No. <br />Shear <br />Box Size <br />in. x in. <br />Normal <br />Stress <br />si <br />Shear <br />Bate <br />inJmin <br />Soaking <br />Stress Time <br />(psi) hour <br />Consolidation <br />Stress Time <br />si hour <br />Lower Soil Upper Soil <br />Yd; Ok q Yd l Wl <br />c % %° c % % <br />GCL <br />�i oil <br />% % <br />Shear Stress <br />Tp TLD <br />Si si <br />Failure <br />Mode <br />1A <br />12 x 12 <br />15.0 <br />0.040 <br />10.0 48 <br />15.0 <br />24 <br />- - - <br />19.0 <br />116.2 <br />6.3 <br />5.4 <br />(1) <br />lB <br />12 x 12 1 <br />25.0 <br />0.040 <br />10.0 48 <br />25.0 <br />24 <br />- - <br />19,0 <br />89.1 <br />12.8 <br />9.4 <br />(1) <br />IC <br />12 x 12 <br />100.0 <br />0.040 <br />10.0 48 <br />100.0 <br />24 <br />- - - <br />19.0 <br />83.9 <br />43.9 <br />28.1 <br />(1 <br />ID <br />12 x 12 <br />150.0 <br />0.040 <br />10.0 48 <br />150.0 <br />24 <br />- - <br />19.0 <br />73.7 <br />65.4 <br />40.4 <br />(1) <br />Notes,- (1) Sliding (i.e., shear failure) occurred between the GCL and the textured sideof the geornembrane during each test. <br />(2) The reported total -stress parameters of friction angle and adhesion were determined from a best -fit line drawn through the test data. Caution should be exercised in using <br />these strength parameters for applications involving normal stresses outside the range of the stresses covered by the test series. The large-displacement(LD) shear strength <br />was calculated using the shear force measured at the end of the test. <br />DATE OF TEST: <br />FIGURE NO. <br />_PROJECT NO. <br />DOCUMENT NO. <br />FILE NO. <br />4 to 7 October 2002 <br />A -i <br />SG12086 <br />SG102131 <br />C <br />