基坑开挖对既有盾构隧道与地层的影响分析  

Influence of Foundation Excavation on the Adjacent Existing Shield Tunnels and Loess Strata

作　　者：戚长军[1] 刘争宏[1] 余武术 赵星纬[1] 

机构地区：[1]机械工业勘察设计研究院,陕西西安710043

出　　处：《水利与建筑工程学报》2014年第5期142-146,共5页Journal of Water Resources and Architectural Engineering

摘　　要：针对黄土地区基坑开挖对下伏既有盾构隧道影响及其安全评价,采用有限差分法数值软件,结合实际场地的水文地质和工程地质条件,建立三维数值模型,进行施工过程的数值模拟与既有线路安全评价。研究结果表明,基坑群开挖对盾构下伏既有隧道影响较大,基坑构筑物施作时既有隧道变形减小,基坑群采用不同步开挖将有利于减小对下伏既有隧道的影响,并针对不同施工阶段的既有盾构隧道变形进行安全评价分析,认为这种工法与加固措施满足既有盾构隧道变形控制要求。Regarding to the influence of foundation pit excavation on the adjacent existing shield tunnel and its safety e-valuation ,a finite differential software was adopted to establish a three -dimensional numerical model based on the in situ hydrogeological and engineering geological condition .And then the numerical simulation of the construction process and the exiting route safety evaluation were obtained through the model .The results indicate that foundation pit excavation has great impact on the adjacent existing shield tunnel ;deformation of the tunnel becomes smaller during the construction of the foundation pit structure ;when the excavation of the foundation pit group is carried out out of synchronization ,it is beneficial to reducing the effect on the existing shield tunnel ;the construction method and reinforcement measure are con-sidered competent for the deformation control according to the safety analysis and evaluation of the tunnel deformation in different stages of the construction .

关 键 词：黄土 基坑开挖 地铁 盾构隧道 数值模拟 

分 类 号：TU941[建筑科学—建筑技术科学]