水泥搅拌防越流墙在基坑降水中的计算应用  

Calculation and Application of Cement Stirred Anti-flow Wall in the Foundation Pit Dewatering

作　　者：李辉[1] Li Hui(China Railway 16th Bureau Group Co.Ltd.,Beijing 100018,China)

机构地区：[1]中铁十六局集团有限公司,北京100018

出　　处：《铁道建筑技术》2017年第9期23-27,共5页Railway Construction Technology

基　　金：国家自然科学基金项目(41372283)

摘　　要：地下连续墙和水泥搅拌防越流墙的共同作用,可以防止多层含水层越流补给,从而起到保护周边环境和降低沉降的作用。以天津某地铁车站基坑开挖工程为例,通过数值模拟计算和实际工程应用,分析了不同埋置深度的水泥搅拌防越流墙在越流含水层基坑降水过程中对基坑周边含水层水位变化和地面沉降变化的影响,得出以下结论:(1)地基土存在越流含水层时,水泥搅拌防越流墙在基坑工程降水过程中能够有效降低基坑周边含水层水位的变化和基坑周边地面沉降的变化;(2)随着围护结构埋置深度的增加,基坑周边含水层水位变化最大值和地面沉降最大值均减小,通过数值模拟可以计算具体工程围护结构的最优埋置深度;(3)随着围护结构埋置深度的增大,基坑周边地面沉降影响半径逐渐减小;(4)在基坑降水施工过程中,水泥搅拌防越流墙能够有效减小基坑降水对地表沉降以及对周边含水层的影响。The joint application of diaphragm walls and cement stirred anti-flow walls can prevent multilayer leaky aquifer recharge to protect the surrounding environment and reduce the role of settlement.This paper takes case of a subway station excavation,by the use of numerical calculation and actual application to analyze the influence of different burying depth to the change of pit surrounding aquifer water level and land subsidence.The results are as follows:(1)the cement stirred anti-flow walls can effectively reduce the changes of pit surrounding aquifer water level and land subsidence during the process of foundation dewatering when soil exists leaky aquifer.(2)With the increase of envelope buried depth,the maxi-mum of pit surrounding aquifer water level changes and the land subsidence reduces,and the numerical simulation can cal-culate the optimal depth of buried concrete engineering envelope structure.(3)With the increase of envelope burying depth,the radius of influence around foundation land subsidence decreases gradually.(4)In the construction process of foundation pit precipitation,the application of cement stirred anti-flow wall can effectively reduce the ground settlement caused by construction process,as well as the impact on the surrounding aquifers.

关 键 词：基坑降水 地面沉降 水泥搅拌防越流墙 数值模拟 

分 类 号：TU463[建筑科学—结构工程] U231.4[建筑科学—土工工程]