When the cohesion of a soil is specified as zero, the minimum factor of safety will always tend towards the infinite slope case where the factor of safety is, U*-%V$3+w5
F.S.= tanφ/ tan α l!oU9
where: =%a.C(0&G
φ = the soil friction angle j#-74{Y$
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α = the inclination of the slope. |_O1V{Q=
也就是说,如果c取值为0,计算边坡的安全系数,大小等于anφ/ tan α,phi为内摩擦角,alpha为坡脚,边坡安全系数等于1,phi值得取45度(1:1的坡,我当坡脚是45度),且此时滑面是接近坡面的浅层滑面,这显然与事实不符。