Abstract:
The stability of the foundation pit is affected by the drainage construction method. In this paper, the numerical simulation method is used to study the stability of the foundation pit under the three conditions:pit drainage, synchronous drainage of foundation pit and outside, concretion and then the water level outside pit rising in excavation course of foundation pit. The research result shows that the safety factor of foundation pit decreases with the increase of excavation depth; pit drainage in the earlier stage of foundation pit engineering is not very important. The stability of the foundation pit is the worst when it is only drained inside, and drainage outside pit is useful for improving the steady state.