“洞柱法”地铁车站施工沉降数值及现场监测研究  

Numerical Analysis and Field Monitoring of Construction Settlement of Subway Station Using PBA Method

作　　者：刘力[1] 赵德平[1] 

机构地区：[1]北京市市政工程设计研究总院有限公司,100082

出　　处：《特种结构》2015年第5期16-20,共5页Special Structures

摘　　要：北京地铁15号线清华东站为地下两层侧式站台车站,采用"洞柱法"施工,为北京地区采用"洞柱法"施工单跨跨度最大的车站。车站主体结构采用"CD法"扣拱,减小了扣拱施工风险和施工沉降。首先对车站施工过程中各阶段地表沉降监测结果进行了总结分析,进而建立数值计算模型,研究了"洞柱法"暗挖车站分别采用单柱双跨、双柱三跨的地层沉降。对小导洞开挖的群洞效应、单柱双跨大跨度"洞柱法"暗挖车站"CD法"扣拱地层沉降、双柱三跨"洞柱法"暗挖车站扣拱施工地层沉降均进行了计算分析。通过现场监测及数值计算结果表明,采用"CD法"扣拱施工的大跨度"洞柱法"暗挖车站,可以较好地控制施工风险和地层沉降。通过本文的研究,为北京地区"洞柱法"暗挖车站采用单柱双跨和双柱三跨断面形式时施工风险和沉降控制的判断有较好的借鉴和参考意义。The Tsinghua East Station of Beijing 15th Subway is two floor underground and side platform station. The station was constructed by PBA method. The single span of the station is the largest in Beijing. The arch excavation of the station uses the method of＂CD method＂, and has a good effect of settlement control and construction risk control. The result of ground settlement monitoring was analyzed. The ground settlement during the cave excavation and the arch excavation of single column double span PBA method station and double column three spans PBA method station were studied by the numerical analysis. The multi-tunnel effect and the settlement control of the ＂CD method＂ arch excavation were analyzed by the numerical analysis. According to the result of monitoring and the numerical analysis, the ＂CD method＂ arch excavation has a good effect of settlement control and construction risk control. These projects provide a good reference for the choice of single column double span PBA method station or double column three spans PBA method station in Beijing.

关 键 词：群洞效应 洞柱法 地层沉降 CD法扣拱 

分 类 号：U231.3[交通运输工程—道路与铁道工程]