地铁双线隧道开挖地表沉降规律及计算方法研究  

Study on the law and computational method of ground surface settlement induced by double-line tunnel excavation

作　　者：卢健[1] 姚爱军[1] 郑轩 张剑涛[3,4] 田甜 LU Jian;YAO Aijun;ZHENG Xuan;ZHANG Jiantao;TIAN Tian(The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;China Academy of Building Research,Beijing 100013 China;CABR Foundation Engineering Co.,Ltd.,Beijing 100013,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]中国核电工程有限公司,北京100840 [3]中国建筑科学研究院,北京100013 [4]建研地基基础工程有限责任公司,北京100013

出　　处：《岩石力学与工程学报》2019年第S02期3735-3747,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51578023,51578001)。

摘　　要：应用数值模拟方法,结合现场实测数据,对上软下硬地层中,双线隧道施工诱发地表沉降规律及其计算方法进行了研究。研究结果显示:双线隧道施工完成后,地表横向沉降曲线呈非对称分布,先行隧道上方的地表沉降量大于后行隧道上方的地表沉降量;双线隧道错距施工过程中,地表沉降曲线最大值位置由先行隧道上方逐步向后行隧道上方移动,沉降变形主要发生在后行隧道穿越监测断面之前。数值模拟正交试验结果显示,隧道埋深和隧道间距对施工过程中地表沉降影响较大,设计过程中,应充分考虑隧道埋深及隧道间距对地表沉降产生的影响。正交试验结果的非线性拟合分析结果显示,双线隧道施工诱发地表沉降计算公式中的i值与隧道开挖顺序无关,最大沉降量比γ直随隧道间距增加而轻微减小,当开挖错距在隧道开挖纵向影响范围内时,γ值变化不大。引入参数γ对双线隧道开挖地表沉降计算公式进行改进,并将改进后的地表沉降计算结果与实测结果进行对比,验证了该计算公式的正确性。Based on the numerical simulation method and the field measured data,the law and computational method of the ground surface settlement initiated by the excavation of the double-line tunnel located in the upper-soft and lower-hard stratum are studied.The results show that after the completion of the tunnel excavation,the lateral settlement curve of the ground surface is asymmetrically distributed.The ground surface settlement above the preceding tunnel is larger than the ground surface settlement above the rear tunnel.During the excavation of the double-line tunnel,the location of the maximum settlement of ground surface gradually moves from the centerline of preceding tunnel to the direction of the rear tunnel,and the settlement mainly occurs before the trailing tunnel crosses the monitoring section.The numerical simulation results indicate that the depth and spacing of the tunnel significantly influence the ground surface settlement.Therefore,the influence of tunnel depth and tunnel spacing on ground surface settlement is recommended to be fully considered during tunnel design stage.In addition,the non-linear fitting analysis of orthogonal experimental results presents that the parameter i in the calculation formula of ground surface settlement is independent of the tunnel excavation order,and the maximum settlement ratioγdecreases slightly with the increase of tunnel spacing.When the staggered distance of the excavation is within the longitudinal influence range of tunnel excavation,γhas a little change.Accordingly,the parameterγis introduced to improve the calculation formula of ground surface settlement for double-line tunneling scenarios,and the calculation formula is validated by comparing the calculated results with the measured data.

关 键 词：隧道工程 双线隧道 地表沉降 数值模拟 计算方法 正交试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]