承压水基坑抗突涌定量分析的复杂性和新思路

Complexity and New Ideas of the Auti-bursting Stability of Confined Water Foundation Pit

随着基坑开挖深度的增加,抗突涌稳定成为影响基坑安全性的主要因素。在已有研究成果和大量工程实践基础上,总结了影响基坑突涌发生的原因和定量分析的复杂性,提出了基坑突涌定量分析的新思路,即借助"水力劈裂"来揭示突涌机理,将影响基坑突涌稳定的因素(隔水层厚度、基坑平面尺度及围护结构)作为一个系统来建立突涌定量判定方法。这为基坑突涌稳定分析开辟了一条新径,可促进该领域向适用性发展。

With the excavation depth increase ,the bursting stabilization had become a major factor affecting the security of foundation pit. On the base of research situation about foundation pit stabilization and a large number engineering practices,the factors and the complexity that affected the stability of foundation pit were analyzed. The new ideas about mechanism and determining methods of bursting in foundation pit were proposed, that with the ＂hydraulic fracturing＂ to explain the mechanism of bursting and the factors that affect the stability of foundation pit （impermeable layer, pries and enclosure structure）as a system to analyze the anti-bursting stability and the bursting of foundation could be divided into two types, system intensity failure and system stiffness failure. It had opened a new path about foundation pit stability analysis and could promote the development of the field to the applicability.