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中文摘要：
本文以一个失事的基坑为例,分析了它的各种强度指标的合理性。指出饱和软黏土室内试验的不排水和快剪强度往往偏低;进行基坑的稳定分析中,采用现场十字板剪切试验的不排水强度比较合理;如果在稳定分析中使用固结不排水（固结快剪）强度指标,则抗滑力（矩）中的自重应力应当用浮重度计算。
英文摘要：
In the paper, through an accident of the subway station pit in saturated soft clay ground, various kinds of shear strength parameters of the soft clay are analyzed, it is indicated that the shear strength from unconsolidated-undrained （UU） test and quick test are usually underestimated. In stability analysis of foundation pit in saturated soft clay ground, the undrained shear strength from vane shear test is applicable. In the analysis, if the consolidated undrained （CU） or consolidated quick shear strength is used, the self- weight stress in sliding resistance should be effective stress.
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