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本文通过在软土地基深基坑支护中土压力、孔隙水压力的大量测试，经统计分析、反分析及对比分析，提出了主动土与被动土不同的受力机理，利用朗肯公式计算时，应取土的不同强度指标，即主动土压力计算取固结快剪指标，被动土压力计算取快剪指标。
In this paper, through a large number of tests of earth pressure and pore water pressure in deep foundation pit support of soft soil foundations, statistical analysis, back analysis and comparative analysis are presented to propose different force mechanisms of active soil and passive soil, which are calculated using Rankine formula. At the same time, different strength indexes of the soil should be taken, that is, the active soil pressure is calculated by taking the consolidation fast shear index, and the passive earth pressure is calculated by taking the fast shear index.