地铁深基坑渗流应力耦合研究

研究目的:武汉地区深基坑事故中,九成以上是因为地下水控制失效造成的。其中,承压水含水层在长江一级阶地中普遍存在,且含水层厚度很大,承压水头很高,成为武汉地区深基坑工程的一大特点。针对武汉长江一级阶地地铁深基坑,研究其降水与开挖施工过程中引起的地面沉降以及基坑稳定等影响与变化规律具有重要的现实意义。研究结论:对深基坑降水与开挖的流固耦合效应进行了分析,建立了渗流场与应力场耦合计算模型。使用FLAC3D对武汉长江一级阶地深基坑降水与开挖施工过程进行了渗流应力耦合模拟;计算结果表明,地表沉降形成了二次函数曲线分布形态的沉降凹槽;地下连续墙以下渗流速度最大,容易发生渗透破坏;相较于不考虑流固耦合计算,考虑耦合的计算结果与工程实际规律更为吻合,能更好地的预测与信息化施工。

Research on Seepage Stress Coupling of Metro Deep Foundation Pit

Research purposes:The 90% accident of deep foundation pit in Wuhan were caused by failing control of underground water.The confined water aquifer commonly exists in the first Yangtze River's terrace with thick aquifer and high water head.This is an important feature of the deep foundation pit project in Wuhan.Therefore,studying the ground settlement caused by precipitation and excavation,the stability of the foundation pit and the change law of ground settlement has the important practical significance for ...