水平填土面上的朗肯土压力 The Rankine's earth pressure on the level fill surface 假设:(1)墙体为刚性体 (2)墙背垂直,光滑 Consider a semi-infinite mass of soil with a horizontal Surface and having a vertical boundary formed by a smooth wall surface extending to semi- infinite depth, as represented in Fig 6-9. The soil is assumed to be homogeneous(均匀) and isotopic(各向同性) (一)主动土压力( Active earth pressure) 1.无粘性土(none- cohesive soil) C=0,由(5-14) 1+82(45°二、水平填土面上的朗肯土压力 The Rankine’s earth pressure on the level fill surface 假设:（1）墙体为刚性体 （2）墙背垂直，光滑 Consider a semi-infinite mass of soil with a horizontal Surface and having a vertical boundary formed by a smooth wall surface extending to semi￾infinite depth, as represented in Fig 6-9. The soil is assumed to be homogeneous （均匀） and isotopic（各向同性）. （一）主动土压力（Active earth pressure ） 1．无粘性土(none-cohesive soil) C=0，由（5-14） ) 2 (45 2 3 1   =  + g  −