承压水影响下深基坑突涌判定方法的对比研究  

A Comparative Study on the Methods for Judging the Inrush of Deep Foundation Pit under the Influence of Confined Water

作　　者：徐敏 何亮[2] 李雄威[2] XU Min;HE Liang;LI Xiong-wei(Second Geological Brigade of the Jiangsu Provincial Geological and Mining Bureau,Changzhou Jiangsu 213022China;Changzhou Institute of Technology,Changzhou Jiangsu 213032 China)

机构地区：[1]江苏省地矿局第二地质大队,江苏常州213022 [2]常州工学院,江苏常州213032

出　　处：《江苏建筑》2021年第2期74-77,91,共5页Jiangsu Construction

基　　金：常州市科技支撑计划(CE20185039)。

摘　　要：针对常州地铁车站深基坑工程,开展了数值模拟和解析法判定基坑突涌的对比研究,获得了以下研究成果:基坑突涌的机理为隔水层厚度过小,将无法抵抗下方承压水顶力,在隔水层和承压含水层界面处产生裂缝并持续发展直至贯通;均质连续体分析法认为土体内部发生顶升剪切破坏导致了基坑突涌,而隔水层拉裂破坏判别法则认为隔水层表面土体发生拉裂破坏导致了基坑突涌,建议隔水层临界厚度取以上两种方法计算的大值;结合《建筑基坑工程监测技术规范》的建议报警值,相比于基于强度破坏的判定标准,基于变形控制判定标准的基坑突涌数值模拟能提出更为合理的隔水层临界厚度值。Aiming at the deep foundation pit project of Changzhou metro station,the comparative study of numerical simulation and analytical method to determine the foundation pit inrush is carried out,and the following research results are obtained:the mechanism of foundation pit inrush is that the thickness of the aquiclude is too small to resist the top pressure of the confined water below,and cracks are generated at the interface between the aquiclude and the confined water bearing layer and continue to develop until they are connected;the homogeneous continuum analysis method considers that the foundation pit inrush is in the soil It is suggested that the critical thickness of the aquiclude should be taken as the large value calculated by the above two methods.Combined with the recommended alarm value in the technical code for monitoring of building foundation pit engineering,compared with the judgment standard based on strength failure,it is based on deformation The more reasonable critical thickness of the aquiclude can be obtained by the numerical simulation of the inrush of the foundation pit.

关 键 词：深基坑 基坑突涌 临界厚度 判定方法 

分 类 号：U231.4[交通运输工程—道路与铁道工程] TU463[建筑科学—结构工程]