基于数值试验的地下交叉隧道施工分析  

Construction analysis of underground cross tunnel based on numerical test

作　　者：杨文东[1] 吕显先 张建国 张连震 井文君[1] YANG Wendong;LYU Xianxian;ZHANG Jianguo;ZHANG Lianzhen;JING Wenjun(College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266580,China;Shandong Zhengyuan Construction Engineering Co.,Ltd.,Jinan 250101,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [2]山东正元建设工程有限责任公司,山东济南250101

出　　处：《实验技术与管理》2020年第10期135-140,共6页Experimental Technology and Management

基　　金：国家自然科学基金项目(51979281);山东省本科教学改革项目(M2018B366);山东省研究生教育创新计划(SDYY17020);中国石油大学(华东)教学改革项目(JY-A201815,JY-B201884)。

摘　　要：虚拟仿真与数值试验作为物理实验的重要补充,近些年发展迅速并在大学本科和研究生教学中取得了显著效果。该文以地下交叉地铁隧道施工的案例进行数值试验分析,以期对现场施工和支护提供指导建议,并对土木工程的数值仿真案例教学提供借鉴。某地铁R1、R2号线盾构隧道先后施工并下穿京沪高铁,采用数值分析软件FLAC3D对多期地铁隧道R1、R2线交叉施工进行数值试验研究,结果表明:R1线开挖后地表沉降模拟值和监测值基本吻合,地表沉降曲线总体上呈“V”型,由于两条隧道相距较近,在共同的扰动区内沉降值增大;R2线开挖进一步引起周围土体发生扰动和变形,地表沉降值明显增大,双线开挖增加了共同扰动区的沉降值,并产生“V”型沉降槽;隔离桩能有效减小隔离桩外侧地表沉降以及水平向变形。As an important supplement to physical experiment, the virtual simulation and the numerical test have developed rapidly in recent years and have played a significant role in undergraduate and graduate teaching. In this paper, a case of the construction of underground cross metro tunnels is analyzed by numerical test to provide guidance and suggestions for the field construction and support and to provide reference for the numerical simulation case teaching of civil engineering. The shield tunnels of the line R1 and line R2 of a subway have been constructed successively and passed through the Beijing-Shanghai high speed railway successively. The numerical test of multi-stage subway tunnel line R1 and line R2 cross the construction is carried out by using numerical analysis software FLAC3D. The results show that the simulated value of surface settlement is basically consistent with the monitoring value after the excavation of line R1, and the surface settlement curve is generally in a "V" shape. Due to the close distance between the two tunnels, the settlement value increases in the common disturbance area. The excavation of line R2 further causes the disturbance and deformation of the surrounding soil and the surface settlement value increases obviously. The double track excavation increases the settlement value of the common disturbed area and produces a "V" settlement tank. The isolation pile can effectively reduce the surface settlement and horizontal deformation outside the isolation pile.

关 键 词：数值试验 实验教学 交叉隧道 地表沉降 隔离桩 

分 类 号：TU443[建筑科学—岩土工程]