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Sr,OPIi STARrr,TTY A4AF,Y:-'JS <br /> The data from the laboratory testing <br /> program and the slope geoi^.etry model -.-sere coc:bined in order to <br /> establish a raodcl for slope stahility analysis . The analysis <br /> was performed using computer techniques, to facilitate cor:putation. <br /> The progran used for this analysis <br /> was SSTAB 1, coded by Stephen G. Wright at the University of <br /> Texas. This program uses Spencer ' s method for slope stability <br /> analysis. Spencer ' s inethod is a limit-egailibruim, method-of- <br /> slices technique. <br /> The slope geomtetry decr_ibed in the <br /> previous section was used, with the toe of the slope at coord- <br /> inates (200, 100) . Coordinate s 7stem. increiaents were in En;lis`_i <br /> units (feet) . It was ass�iir.ed that the rocklines and phreatic <br /> surface are looa_ed below any potential failure circle . <br /> For the shale fill, a Friction ante, <br /> Q == 290 and a c)hesion c = 1295 ps.f wore used . The unit :-Jeigh'_ <br /> of the fill wa:3 tahen as 119. 0 pcf, which is eC;aivalent to 9i1; <br /> of the r:.axim..urr. standa�_d Proctor density for this material. The <br /> friction angle for the native sabfill was ta'cen as 330, with a <br /> cohesion of 240 psf and a unit weight of 110 psf. <br /> The analysis was performed for three <br /> face slope configurations : 2-horizontal to 1-vertical, 2 . 5 horizon- <br /> tal to 1-vertical, and 2 . 8-horizontal to 1-vertical. Critical <br /> circle inf_or.mation for these slope configurations are as follows : <br /> Slope Circle Coordinates Safety <br /> Gradient X Y Radius Factor <br /> 2 : 1 235 216 121. 5 3. 5 <br /> 2. 5 : 1 256 2130 175 . 9 3. 5 <br /> 2 . 3 : 1 2u4 280 195. 5 3. 9 <br /> -6- <br />