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, \cr)O^&
F.S.= tanφ/ tan α _ ;!$1lM[
where: "Dt:
8Nf^
φ = the soil friction angle ['%$vnS5S
α = the inclination of the slope. )wM881_!
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。