施工技术 2015年12月下 56 CONSTRUCTIONTECHNOLOCY 第44卷第24期 DOI:10. 7672/ sgjs2015240056 既有线顶进涵施工现场监测与数值模拟研究* 宋章伦"，胡仲春”，王金河”，侯立波”，张卅卅"，张生‘ (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） 【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6kPa，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。
[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 [中图分类号]U449.5 【文献标识码】A [文章编号]1002-8498（2015）24-0056-04 Research on the Field Monitoring and Numerical Simulation of Stabilityin theExistingRailwayJackingCulverts Construction Song Zhanglun'，Hu Zhongchun²，Wang Jinhe²,Hou Libo²,Zhang Sasa',Zhang Sheng' (1.School of Resource and Environmental Engineering,Wuhan University of Technology,Wuhan, Hubei 430070,China; 2.China Railway 14th Construction Bureau Co.,Lud.Ji'nan, Shandong250014,China;3.Comprehensite Geological Team of Shijiazhuang， Geological Exploration Bureau of HebeiProvince，Shjiazhuang,Hebei050085，China） Abstract;To make the existing railway jacking culverts construction excavation process pleted 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 setlement is 0. 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 setlement, 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. Key words:railroads; jacking culverts construction;discrete simulation;monitoring;ea...
