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Test Series 2 <br />Normal Stress <br />Shear Plane <br />Observations <br />4000 psf <br />GCL traveled with the <br />Internal in the soil <br />geomembranc. Sheared soil had <br />fallen over the rear of the bottom <br />box. <br />GCL traveled with the <br />8000 psf <br />Internal in the soil <br />geomembrane. Sheared soil had <br />fallen over the rear of the bottom <br />box. <br />GCL traveled with the <br />13000 psf <br />geomembranc. Sheared soil had <br />Internal in the GCL and the soil <br />fallen over the rear of the bottom <br />box. GCL had sheared <br />internally. <br />RESULTS <br />The normal stresses were graphed against the shear stresses and linear regression was applied to obtain <br />the best fit straight line. The y -intercept describes the adhesion value of the interface, and the arctan of <br />the slope of the line provides the friction angle. The- results are provided in the following tables and <br />graphs. Because the GCL sheared internally on the 13000 psf normal stress of test series 2, the <br />interpretation of the residual is left for the engineers of the project. <br />JirV Matthews <br />Research Technician <br />National Seal Company <br />