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� r <br /> 428 Designing with Geomembranes Chap. 5 <br /> 7be situation with an anchor trench at the end of the runout section is illusuattd in <br /> i Figure 5.28. The configuration requires some important Assumptions trgardmg ft start <br /> of stress within the anchor trench and its resistance mechanism. In order to establish static ;. <br /> i equilibrium, Daniel(27)has suggested using imaginary and frictionless pulleys as shown a' <br /> r on Figure 5.28, which allows for the geomembrane to be Considered in its continuous <br /> " form. <br /> ? GoonwmDnrn <br /> .i <br /> i <br /> ,i' J.p>]C:r::%:>:;:,.:.•:;:y:isjai;;::;Y}:;::j:;i::a`iJiS'/C ....::..:;,::,.;z•2J^S�a;:.: ... .. <br /> .I .:x:'.,:. >.,. i• ry». J T 'VA< \Y 7 cOY'!f wl l <br /> .J ,f' QAC(♦ cfb .c > > ^ .. MRS <br /> --s—•—F� <br /> imagirwy d Fwt� Fwr A <br /> %;i;• � Q h{CtiOnlesf put" <br /> I T <br /> rqMVs of gewmmbmw MaM McdM wah awbor VcWh wW mlm- <br /> ed SUnsw fans involved. <br /> T'.ri,w = Fu + FL + 2Far (5.17) <br /> where <br /> Tann . ffi the v,n,,, t, in which <br /> asnow = the allowable goomesnbmne stress = or.WFS, <br /> Qve = the ultimatt geornembrane stress, e.g., yield or break. <br /> FS = the factor of safety, and <br /> t - the geomembrane thickness; " <br /> Fu — the friction force above geomembmne(assumed to be negligible, since the <br /> cover soil probably moves along with the lints as it deforms); <br /> Fc - q tan 8 (Liao), in which µe, <br /> q - the surcharge pressure =d.y. <br /> : <br /> the depth of Dover soil, ,• <br /> *fee a the unit weight of covet soil, <br /> 8 = the friction angle between geornembrane and soil, and <br /> Lico — the (unknown) length of runout; and <br /> FAr = (aA)..e tan 8 (d T). in which 4 <br /> g <br /> • s <br />