| 拉林铁路板块缝合带隧道地应力分析 |
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| 引用本文： | 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. |
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| 作者姓名： | 欧小强 王奭 李永亮 刘志强 郑宗溪 吴剑 |
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| 作者单位： | 1. 中铁西南科学研究院有限公司, 成都 611731;2. 中国铁路青藏集团有限公司, 西宁 810007;3. 中国铁路总公司拉林铁路建设总指挥部, 拉萨 850000;4. 中国中铁二院工程集团有限责任公司, 成都 610031 |
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| 基金项目： | 中国铁路总公司科技研究开发计划项目（2017G006-B） |
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| 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。
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| 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 |
| 收稿时间： | 2018-07-27 |
In-Situ Stress Analysis of Tunnel in Plate Suture Zone of Lhasa-Nyingchi Railway |
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| 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 Unviersity:Earth Science Edition,2019,49(6):1689-1697. |
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| Authors: | Ou Xiaoqiang Wang Shi Li Yongliang Liu Zhiqiang Zheng Zongxi Wu Jian |
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| Institution: | 1. China Railway Southwest Research Institute Co., Ltd., Chengdu 611731, China;2. China Railway Qinghai-Tibet Group Co., Ltd., Xining 810007, China;3. Lhasa-Nyingchi Railway Headquarter, China Railway Corporation, Lhasa 850000, China;4. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China |
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| 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. |
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| Keywords: | plate suture zone in-situ stress railway tunnel maximum principal stress hollow inclusion stress-relief method |
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