明挖长大深基坑围岩稳定性预测分析

Prediction Analysis of the Stability of the Surrounding Rock of Open Excavation of Large-Long-Deep Foundation Pit

随着城市轨道交通的车站规模的迅速提升,对长大深基坑围岩稳定性的分析变得尤为重要。本文以河南某市城市轨道交通2号线九都西路站的基坑开挖为例,采用摩尔-库伦(Mohr-Coulomb)模型,通过FLAC3D软件操作界面,对车站基坑进行数值模拟并对基坑的围岩塑性区、水平位移、竖向沉降、围护结构内力以及开挖引起既有建筑的形变进行了分析。

With the rapid increase of the station scale of urban rail transit,the analysis of the stability of the surrounding rock of the large-long-deep foundation pit becomes especially important.Taking the excavation of Jiudu West Road Station on Line 2 of urban rail transit in a city of Henan as an example,this paper adopts Mohr-Coulomb model and FLAC3D software operating interface.The numerical simulation of station foundation pit is carried out and the plastic zone of surrounding rock,horizontal displacement,vertical settlement,internal force of envelope structure and deformation of existing building caused by excavation are analyzed.