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中文摘要：
本文是对与基坑有关的规范的系列讨论的第三部分,指出在基坑支挡结构的抗滑移、抗倾覆稳定验算和用瑞典圆弧法进行整体稳定验算以及进行坑底抗隆起验算时,对于饱和黏性土,如果使用不固结不排水（UU）强度指标,可以使用饱和重度、也可以使用浮重度计算土自重引起的抗力（或力矩）;但当使用固结不排水（CU）强度指标时,其抗力部分中的自重应按浮重度计算,按饱和重度计算在理论上是错误的,在实践中是偏于危险的。
英文摘要：
This is the third part of a series of discussion papers. In the paper, it is proposed that in checking of the stability against sliding, the stability against the overturning of retaining structure, the overall stability by Swedish circle method and the stability against the heaving of pit bottom, if the UU strength parameters of saturated clay soil are adopted, the gravity of soil and wall in the calculation of resistant force can be calculated by using saturated unit weight or buoyant unit weight; if the CU strength parameters of saturated clay soil are adopted, the gravity of soil and wall in the calculation of resistant force has to be calculated by using buoyant unit weight rather than by saturated unit weight of soil.
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