地连墙深度对强渗透基坑变形规律与稳定性的影响研究  

Study on the Influence of the Depth of Diaphragm Wall on the Deformation Law and Stability of Strong Permeability Foundation Pit

作　　者：何应道[1,2] HE Yingdao(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan Hubei 430063,China;National&Local Joint Engineering Research Center of Underwater Tunnel Technology,Wuhan Hubei 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]水下隧道技术国家地方联合工程研究中心,湖北武汉430063

出　　处：《铁道建筑技术》2023年第1期59-62,共4页Railway Construction Technology

基　　金：国家自然科学基金面上项目(51279202)。

摘　　要：结合湖南省常德沅江隧道明挖基坑,考虑高水压圆砾地层强渗透性特点,采用有限差分软件开展流固耦合分析,研究地连墙深度对强渗透基坑变形及稳定性的影响。研究表明,基坑底部的抗渗流能力随着地连墙深度的增大而增强,而基坑的变形呈现出减小的趋势。进一步根据基坑工程变形与稳定控制标准,认为强渗透地层中连续墙设计应考虑地连墙深度与坑底相对隔水层的相对关系,建议为进入隔水层范围内为最佳。相关研究对于类似工程设计具有一定的参考借鉴作用。Taking the open excavation foundation pit of Yuanjiang Tunnel in Changde, Hunan Province as the object, considering the strong permeability characteristics of high water pressure round gravel stratum, the author studies the influence of the depth of diaphragm wall on the deformation and stability of strong permeability foundation pit by using finite difference software to make the analysis of coupling of fluid and solid. The research shows that the anti-seepage ability of the bottom of the foundation pit increases with the increase of the depth of the ground connecting wall, while the deformation of the foundation pit shows a decreasing trend. Further, according to the deformation and stability control standard of foundation pit engineering, the relative relationship between the depth of diaphragm wall and the relative water resisting layer at the bottom of the pit should be considered in the design of diaphragm wall in strong permeability stratum, and it is the best to enter the range of water resisting layer. The relevant research has a certain reference for similar engineering design.

关 键 词：地连墙深度 深基坑 流固耦合分析 变形规律 渗透稳定性 

分 类 号：U455.452[建筑科学—桥梁与隧道工程]