邻近既有高速铁路深基坑降水问题探讨  

Discussion on Dewatering for Deep Foundation Pit Adjacent to Existing High-speed Railway

作　　者：唐鸥玲 陈明浩[1] 袁明 丁文富[1] TANG Ouling;CHEN Minghao;YUAN Ming;DING Wenfu(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Chengdu-Guiyang Railway Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]成贵铁路有限责任公司,成都610031

出　　处：《高速铁路技术》2024年第2期17-21,共5页High Speed Railway Technology

基　　金：中铁二院工程集团有限责任公司科技研究开发计划课题(KDNQ202008)。

摘　　要：针对既有高速铁路附近深基坑降水问题,以某高速铁路盾构井为研究对象,开展现场水文试验以分层获取岩土层渗透系数,探讨渗透系数对基坑降水浸润线的影响,并采用不同方法预测基坑涌水量。首先介绍了深基坑降水设计所需水文地质资料来源,然后绘制既有高速铁路桥墩的水文地质断面图,以检算基坑降水对既有高速铁路的影响是否符合规定限值,为设计合理的降排水措施提供依据。本文的研究成果可为类似工程提供参考。Taking a shield well adjacent to a particular high-speed railway line as an example for case study,this paper aims at addressing the challenges of dewatering deep foundation pits adjacent to existing high-speed railway.For this purpose,hydrological testing was performed in the field to determine the permeability coefficient of soil layers in a stratified fashion,and a discussion was made on how the permeability coefficient influences the seepage line within a foundation pit during dewatering,and predict the water inflow into the pit by employing different methods.The paper started by outlining the origins of hydrogeological information essential for devising dewatering strategies for deep foundation pit.It then proceeded to the creation of hydrogeological cross-sectional diagrams for the existing high-speed railway piers,to evaluate the impact of foundation pit dewatering on the existing high-speed railway structure,to determine if they are within prescribed tolerances.The findings provide a foundation for the formulation of effective and appropriate dewatering and drainage solutions.This paper examined the challenges of dewatering in foundation pits of a real project,and the results provide insights that may be applicable as guidance for similar projects.

关 键 词：高速铁路 桩基 深基坑 降水 水文试验+ 

分 类 号：TU463[建筑科学—结构工程]