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• we suggest t1Tat the last ten (10) to twenty (20) fact of the <br />drain have a four (4) to six (Gj inch pipe placed for the <br />outlet. We suggest that you use more than one (1) outlet <br />drain to drain the collected water from the b1anF:et Iirazn. <br />Fill Slope Stability Analysis <br />The stability of any slope xs dependent on many f,,r~w rs. <br />Typically the stability of a sloi~l: i5 analyzed by calculattug <br />the anticipated yravi tat Tonal force:, Lhtll Cenci to drlvl• th,: <br />mass oC soil downhill and the allttci},,i t,:d int ,•rnal st rl•n•tth <br />of the col } a] ony the expected ,,.., I,o c,f f,l i I arc t h.•t 1. ~ ] 1 <br />resist the downhill movemen LS. li tho drlvruy iorl~l•~ .ur <br />greater than the res isLi ny forco:. LLcn f.,,lnrr• 15 Inual l,r ill. <br />Failure can occur as slow de fnrm.rt ion, cTC•e}. or a :'oml~•.a h,1C <br />• spontanc•c•us failure. <br />Factor:: that influence sloi,~• ::1^Li ] i 1 y can yI•i•c•1 ~~1 ly b< <br />classified as those that inerec.sl_ the stre:;~ (drivzny force) <br />on the system or decrease the str~.~nyth (rl.tstJ ng CntrL>~7 of <br />the soil. Factors that increase t. }le ;,tress m.,y bu: ]ncxuased <br />soil weight by wetting or steepended face of the s!.opr•. <br />Factors that decrease the stye nyth of the soil may hc: weal:uned <br />soil strength and increased pore pro ssurc by lncrcasea moi:turc <br />content or weathering and loosening by freeze/thaw cycle::. <br />Our gross stability analysi•, of th~• till alo}',ea was <br />based on the simplified Hishop:: method of slices. Thlc <br />method assumes that the slope soils will fail as a rotstion <br />-4- <br />M85021GE <br />• <br />~atnbert aria ~.s,~ociates <br />GONSUI ZING GEOiEGNNICAE ENGINEERS AND <br />MATERUI 1ESTING <br />