隧道掘进机撑靴导致洞壁破坏机理的研究  

Research on Surrounding Rock Failure Mechanism due to Gripper Action of TBM(Tunnel Boring Machine)

作　　者：李泰灃 郑婕[2] 张千里[3] 李涛[2] 

机构地区：[1]中国铁道科学研究院,北京100081 [2]北京交通大学土木建筑工程学院,北京100044 [3]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《铁道建筑》2016年第10期50-54,共5页Railway Engineering

基　　金：国家自然科学基金高铁联合基金(U1434211);铁道科学技术研究发展中心项目(J2014G004);中国铁道科学研究院基金中日国际合作项目(2015YJ143)

摘　　要：考虑隧道埋深、隧道洞径和围岩强度3种影响因素,采用有限元软件ABAQUS建模,分析了全断面隧道掘进机撑靴与隧道围岩的相互作用、围岩变形和破坏的规律,并与实测结果进行了对比。结果表明：随隧道埋深的增加,隧道围岩的稳定性逐渐增强;随着隧道洞径的增大,隧道围岩的稳定性逐渐降低,但变化幅度较小;随着隧道围岩抗剪强度的降低,在撑靴荷载作用下隧道围岩的承载力逐渐降低,建议实际工程中隧道围岩的内摩擦角不能小于45°;3种影响因素中,隧道围岩的稳定性对于围岩强度的变化最为敏感,其次是隧道埋深,最后为隧道洞径;辽西北供水工程实测单侧撑靴支撑力为24 900~25 900 k N,可推断出单侧撑靴径向应力为5.72~5.95 MPa,与仿真计算结果一致。Considering such three influence factors as the tunnel buried depth tunnel diameter and surrounding rock strength,the interaction between TBM gripper and tunnel surrounding rocks,the surrounding rock deformation and failure laws were analyzed by using finite element analysis software ABAQUS,which were compared with the measured results.The results show that the stability of surrounding rock increases with the tunnel buried depth increasing,the stability of surrounding rock gradually decreases and the changing amplitude is small with tunnel diameter increasing,the bearing capacity of tunnel surrounding rock decreases under the effect of gripper load with the shear strength decrease of the tunnel surrounding rock,which means that the internal friction angle of tunnel surrounding rock should not be less than 45 in practical engineering.Among the three influence factors,the tunnel surrounding rock stability is mostly sensitive to the change of surrounding rock strength,followed by the tunnel buried depth,and finally sensitive to the tunnel diameter.The measured unilateral gripper support force is 24 900 ~25 900 kN in Northwest Liaoning water supply engineering and the unilateral gripper radial stress can be inferred as5.72 ~5.95 MPa,which is consistent with the simulation results.

关 键 词：全断面隧道掘进机 撑靴 隧道围岩 破坏模式 隧道施工 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]