地下水引起的基坑破坏分析

Analysis of foundation pit collapse caused by groundwater

地下水对基坑开挖支护有着重要影响,由于未探明的上层滞水和管道渗漏等支护设计未充分考虑到的水体是引起基坑坍塌的主要因素。地下水改变了土体以及支护结构的应力状况以及受力情况,并弱化了土体自身的物理力学性质和支护结构的支护强度,探讨了由于地下水引起的基坑失稳坍塌的内在机理。建立了浸水湿化的土体孔隙微结构失稳突变模型。

Groundwater has important effect on excavation support of foundation pits, because the water body not sufficiently taken into account by the support design such as the upper sluggish water and pipeline leaks is the main factor causing foundation pit collapse. Groundwater changes the competitiveness and stress conditions of the territories and support structures, and weakens physical mechanics of the territories itself and supporting intensity of support structures. The intrinsic mechanism was discussed that groundwater caused foundation pit collapse, and the collapse mutation models of inundate wet micro pore structure of the territories were established.