The main influence factors of stability of foundation pit are discussed, especially the influence of seepage induced from head difference.
讨论了影响基坑稳定性的主要因素，特别是由于水头差导致的土体渗流对基坑稳定性的影响。
The time and spatial effects of excavation considering the variation of water head difference between the inside and the outside of a foundation pit were then investigated.
研究了考虑坑内外水头差变化时的基坑工程时间效应和空间效应，并与不考虑坑内外水头差变化的情况进行了对比。
Above all, the effects of some parameters on the settlement are studied, such as the thickness, modulus of the overlaying soil, head difference and transmissibility of the confined aquifer.
讨论了上覆土层厚度、上覆土层弹性模量、承压水水头降深和承压层导水系数对沉降的影响。
Influenced by cohesion, the water head difference in silt is more than that in sand when seepage failure takes place. Influenced by piles, the water head difference of seepage failure also increases.
受黏聚力的影响，粉土破坏时的水头差较砂土大，同时基桩的影响也会增大破坏时的水头差。
Influenced by cohesion, the water head difference in silt is more than that in sand when seepage failure takes place. Influenced by piles, the water head difference of seepage failure also increases.
受黏聚力的影响，粉土破坏时的水头差较砂土大，同时基桩的影响也会增大破坏时的水头差。
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