西瓦利克地层TBM隧道管片受力现场监测研究  

Study on Field Stress Monitoring of TBM Tunnel Segment in Sivalik Formation

作　　者：刘谦彬 赵兴[1,2] 张志强 LIU Qianbin;ZHAO Xing;ZHANG Zhiqiang(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2023年第7期119-127,共9页Railway Standard Design

基　　金：国家自然科学基金项目(51878572)。

摘　　要：为研究喜马拉雅山脉西瓦利克地层压力以及穿越该地层隧道的支护结构受力特征,以首个使用TBM穿越西瓦利克地层的引水隧道为背景,选取9个断面对管片所受外部水、土荷载及内力进行长期现场监测,总结得到该地层下管片外荷载和内力分布特征及变化规律。研究结果表明:西瓦利克地层中管片所受荷载和埋深无明显关系,管片外土压经历施工影响变化阶段-盾构机远离趋于稳定阶段-后期小波动阶段,且地下水会导致荷载明显增大;地层中水土压力表现为竖向大于水平,管片拱顶、仰拱位置内侧受拉,拱腰外侧受拉;西瓦利克中段是工程控制段地层,在荷载计算和结构设计中应重点考虑。In order to study the pressure of the Sivalik formation in the Himalayas and the support structure of the tunnel through this formation,nine monitoring sections are selected for long-term on-site monitoring of the external water and soil loads and internal forces on the segment with reference to the first TBM water diversion tunnel through the Sivalik formation.The distribution characteristics and variation rules of external load and internal force are summarized.The results show that there is no obvious relationship between the load on the pipe sheet and the burial depth in the Sivalik stratum,the load during construction is generally less than the later stable value,and the underground water will lead to a significant increase in the load;the soil and water pressure in the stratum is greater vertically than horizontally;the segment is subject to tension at the inside arch top and invert arch and at the outside arch waist.The middle section of the Sivalik is the engineering control section of the stratum,and should be prioritized in load calculation and structural design.

关 键 词：西瓦利克地层 引水TBM隧道 现场监测 管片受力 喜马拉雅山脉 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] TV554[交通运输工程—道路与铁道工程]