既有线顶进涵施工现场监测与数值模拟研究  

Research on the Field Monitoring and Numerical Simulation of Stability in the Existing Railway Jacking Culverts Construction

作　　者：宋章伦 胡仲春[2] 王金河[3] 侯立波[2] 张卅卅[1] 张生[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]中铁十四局集团有限公司,山东济南250014 [3]河北省地矿局石家庄综合地质大队,河北石家庄050085

出　　处：《施工技术》2015年第24期56-59,共4页Construction Technology

基　　金：国家自然科学基金资助项目(51104112);中央高校基本科研业务费专项资金资助项目(2011-IV-045);武汉理工大学自主创新研究基金创新团队培训与建设项目(2014-VII-023);武汉理工大学自主创新研究基金新教师科研启动基金(2014-IV-140)

摘　　要：为使铁路既有线顶进涵施工开挖过程更加顺利地完成,针对施工中可能出现的安全问题,采用现场监测与离散元数值模拟联合的方法研究分析桩侧土压力和支墩沉降变化规律。研究结果表明:现场监测桩侧土压力最终稳定值为6k Pa,支墩沉降量最终稳定值为0.15mm。二维离散元软件模拟结果总体反映了实测土压力和支墩沉降的发展趋势,计算结果与现场监测结果基本一致。离散法模拟铁路既有线顶进涵施工开挖过程是可行的,对施工中支墩沉降的控制有一定参考价值。To make the existing railway jacking culverts construction excavation process completed more successfully, authors use the method of numerical simulation and field monitoring to analyze the change regulations of the earth pressure against the buttress and the buttress＇ s settlement. The research show that the buttress final settlement is O. 15mm and the monitoring final earth pressure is 6 000Pa in the field measurement. The result of numerical simulation through the two-discrete element method roughly reflects the development tendency of the measured earth pressure and the buttress＇ s settlement,which coincides with the results of numerical Simulation. It＇ s feasible that using discrete element method to simulate the process of existing railway jacking culverts construction and it also has a reference value about the control of the buttress settlement.

关 键 词：铁路 顶进涵施工 离散元模拟 监测 桩侧土压力 支墩 沉降 

分 类 号：U449.5[建筑科学—桥梁与隧道工程]