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proposed crushed rock. A discussion of the shear strength of the geotextile-textured <br /> geomembrane interface is also presented. <br /> 2.0-Geomembrane Puncture Protection <br /> According to Koerner(1998),the allowable pressure(P'wlow)that can be tolerated by a geotextile <br /> layer subject to a protrusion of effective height H is given by, <br /> Pard„ = 50+0.00045 H2 MF .MF .MF RF RF (Eq. 1} <br /> S PD A CR CBD <br /> where, <br /> P'.,,oW =Allowable pressure(in kPa) <br /> M =Mass per unit area of the geotextile cushion(in g/m2) <br /> H =Effective protrusion height(in meters) <br /> MFs =Modification factor for shape of protrusion <br /> MFPD =Modification factor for packing density <br /> MFA =Modification factor for arching <br /> FsCR =Partial factor of safety for creep <br /> FscsD =Partial factor of safety for chemical and biological degradation <br /> A 16-ortyd2 (i.e., 540 g/m2) non-woven needle-punched geotextile cushion is proposed to be <br /> used in Module 1;therefore, <br /> M = 540 g/m2 <br /> For the proposed'drainage layer of a '/2 inch crushed rock (packed stones), the effective <br /> protrusion height can be assumed to be half the maximum stone size;i.e., <br /> H =0.5 x 0.5 inch=0.25 inch=6.35 mm=0.00635 m <br /> For angular stone, <br /> MFs = 1.0 <br /> For packed stones, <br /> MFPD =0.5 <br /> N.\sacDP\2003\Prj\83\835608.3ap.doc <br /> (FSL) <br /> 2 <br />