拉林铁路板块缝合带隧道地应力分析

doi:10.13278/j.cnki.jjuese.20180203

摘要/Abstract

摘要： 青藏高原板块缝合带为印度板块和欧亚板块两大陆块的缝合区域，带区地质条件复杂，构造运动强烈。川藏线拉林铁路几乎沿雅鲁藏布江缝合带展布，高地应力问题十分突出，但目前针对板块缝合带隧道的地应力研究相对较少。本文采用空心包体法对拉林铁路沿线隧道进行了原位地应力测量，并与成兰、兰渝和锦屏等几个典型工程的地应力进行对比分析。研究表明：拉林铁路沿线隧道埋深大，构造应力突出，总体表现为最大水平主应力 > 垂直主应力 > 最小水平主应力；平均侧压系数（1.0~1.5）分布较为集中且处于较高水平；最大主应力量值大多在20~50 MPa之间，最大主应力与埋深的梯度为0.033 7 MPa/m，方向以北北西-北北东向为主。建议采用仰拱结构减小隧道墙脚处的应力集中现象。

关键词: 板块缝合带, 地应力, 铁路隧道, 最大主应力, 空心包体法

Abstract: The Qinghai-Tibetan Plateau suture zone lies between the continental blocks of the India plate and the Eurasian plate, where the geological conditions are complex,and the tectonic movement is strong. The Lhasa-Nyingchi Line of Sichuan-Tibet Railway is almost along the Yarlung Zangbo suture, and its high ground stress causes problems frequently. At present, the study on in-situ stress of the tunnel in plate suture zone is relatively rare. The in-situ stress measurement of the tunnels along the railway was carried out by hollow inclusion stress-relief method, and the in-situ stresses with several typical projects such as Chengdu-Lanzhou Railway, Lanzhou-Chongqing Railway, and Jinping Hydropower Station were analyzed and compared with each other. The results show that the tunnels along the Lhasa-Nyingchi Railway have large buried depth, and the prominent tectonic stress shows as maximum horizontal principal stress > vertical principal stress > minimum horizontal principal stress. The average lateral pressure coefficient distribution is relatively concentrated (1.0-1.5), and at a high level. Most of the maximum principal stresses are between 20-50 MPa, the gradient between maximum principal stress and burial depth is 0.033 7 MPa/m, and the direction of maximum principal stress is NNW-NNE. It is suggested that the invert structure should be used to reduce the stress concentration at the foot of tunnel wall.

Key words: plate suture zone, in-situ stress, railway tunnel, maximum principal stress, hollow inclusion stress-relief method

中图分类号:

U452.1

欧小强, 王奭, 李永亮, 刘志强, 郑宗溪, 吴剑. 拉林铁路板块缝合带隧道地应力分析[J]. 吉林大学学报(地球科学版), 2019, 49(6): 1689-1697.

Ou Xiaoqiang, Wang Shi, Li Yongliang, Liu Zhiqiang, Zheng Zongxi, Wu Jian. In-Situ Stress Analysis of Tunnel in Plate Suture Zone of Lhasa-Nyingchi Railway[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1689-1697.

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