高速公路隧道施工全过程三维弹塑性数值模拟  

3D Elasto-plastic Numerical Simulation of Entire Construction Process for Highway Tunnel

作　　者：佘健[1] 何川[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2005年第3期298-302,共5页Journal of Southwest Jiaotong University

摘　　要：为了获得开挖过程中隧道结构体应力、应变和位移规律,以渝黔二期笔架山隧道北端洞口段实态建模,采用有限元程序对施工全过程进行了三维弹塑性数值模拟,并与现场实测数据进行了比较.研究结果表明,开挖对围岩影响较大的范围在开挖面四周5m以内,且上台阶开挖的影响大于下台阶开挖;围岩沉降和水平位移在开挖前已完成1 /3;围岩塑性区位于开挖面前1. 5m范围内,锚杆主要受本施工段上台阶开挖的影响.In order to obtain the regularities of stress, strain and displacement of tunnel structures during excavation, the northern end of Bijiashan tunnel in the 2nd stage Yu-Qian project was modeled and its construction process was numerically simulated with 3D elasto-plastic finite element method （FEM）. Comparison between simulated and in-situ tested results shows that the range with a great influence of tunnel excavating on surrounding rock is 5 m around an excavation face, excavation of the upper bench has a greater effect than that of the lower bench, and one-third of total settlement and horizontal displacement of surrounding rock has generated before excavating. In addition, the plastic zone in surrounding rock ranges 1.5 m in the front of an excavating face, and rock bolts are mainly influenced by the excavation of the upper bench in the current construction step.

关 键 词：隧道 软弱围岩 弹塑性 三维有限元分析 现场测试 

分 类 号：U451[建筑科学—桥梁与隧道工程]