关于碳质板岩隧道大变形机理及应对措施的探讨
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摘要
兰渝铁路木寨岭隧道是在高地应力、碳质板岩等软弱围岩的复杂地质条件下修建的隧道,在碳质板岩段出现了明显的大变形和局部破坏。针对木寨岭隧道的大变形,文章分析了碳质板岩大变形发生的影响因素,探究了碳质板岩的塑变、板梁弯曲、剪切滑移、压杆破坏等大变形机理,提出了调整隧道围岩受力、加强支护、超前控制等施工措施。
The Muzhailing tunnel of the Lanzhou-Chongqing railway, which is built under the complicated geological conditions of weak surrounding rocks, such as high ground stress, carbonaceous slate, and so on, exhibits obvious large deformation and partial failure in the carbonaceous slate section. Aiming at the large deformation of the Muzhailing tunnel, the influence factors regarding the occurrence of large deformation in carbonaceous slate are analyzed in this paper. The large deformation mechanism is studied, including the plastic deformation of carbonaceous slate, bending of the plate-girder, shear slip, and damage to the pressure bar. Thus, the construction measures, such as the surrounding rock stress, the reinforced support, and the advance control, are adjusted in order to control the large deformation of a tunnel, and this experience provides a reference for future tunnel construction in carbonaceous slate.
The Muzhailing tunnel of the Lanzhou-Chongqing railway, which is built under the complicated geological conditions of weak surrounding rocks, such as high ground stress, carbonaceous slate, and so on, exhibits obvious large deformation and partial failure in the carbonaceous slate section. Aiming at the large deformation of the Muzhailing tunnel, the influence factors regarding the occurrence of large deformation in carbonaceous slate are analyzed in this paper. The large deformation mechanism is studied, including the plastic deformation of carbonaceous slate, bending of the plate-girder, shear slip, and damage to the pressure bar. Thus, the construction measures, such as the surrounding rock stress, the reinforced support, and the advance control, are adjusted in order to control the large deformation of a tunnel, and this experience provides a reference for future tunnel construction in carbonaceous slate.
引文
[1]Lubo Meng,Tianbin Li,Yun Jiang,Rui Wang,Yanrong Li.Characteristics and Mechanisms of Large Deformation in the Zhegu Mountain Tunnel on the Sichuan-Tibet Highway[J].Tunnelling and Underground Space Technology,2013,37:157-164
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[7]关宝树,赵勇.软弱围岩隧道施工技术[M].北京:人民交通出版社,2011,55-177Guan Baoshu,Zhao Yong.Construction Technology of Soft Rock Tunnel[M].Beijing:China Communications Press,2011,55-177
[8]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2008Guan Baoshu.Collection of Key Points in Construction of Tunnel Projects[M].Beijing:China Communications Press,2008
[9]黄志全,王晓睿.软弱隧道塌方机理及治理技术研究[M].北京:科学出版社,2012Huang Zhiquan,Wang Xiaorui.Study on Collapse Mechanism and Countermeasures for Soft Rock Tunnels[M].Beijing:Science Press,2012
[2]王云龙,谭忠盛.木寨岭板岩隧道塌方的结构失稳分析及预防措施研究[J].岩土力学,2012,33(Supp.2):263-268Wang Yunlong,Tan Zhongsheng.Study on Structure Failure and Preventive Measures against Collapse of Muzhailing Tunnel in Slate[J].Rock and Soil Mechanics,2012,33(Supp.2):263-268
[3]王建军.兰渝铁路三叠系板岩隧道变形机理与围岩分级预报探究[J].现代隧道技术,2013,50(2):79-83Wang Jianjun.The Deformation Mechanism of a Tunnel in Triassic Slate and Forecasting Surrounding Rock Classifications[J].Modern Tunnelling Technology,2013,50(2):79-83
[4]中铁第一勘察设计院集团有限公司.木寨岭隧道工程地质勘察报告[R].2010China Railway First Survey and Design Institute Group Co.,Ltd.Engineering Geological Investigation Report of Muzhailing Tunnel[R].2010
[5]铁一院,中铁西南院,国家地震局地壳应力所,等.木寨岭隧道碳质板岩段支护结构及施工方法研究[R].2011China Railway First Survey and Design Institute Group Co.,Ltd,China Railway Southwest Research Institute Co.,Ltd,The Institute of Crustal Dynamics,et al.Study on Supporting Structure and Construction Method of Muzhailing Tunnel in Carbonaceous Slate[R].2011
[6]肖尧,付小敏.碳质板岩力学性质研究[J].地质灾害与环境保护,2011,22(1):84-86Xiao Yao,Fu Xiaomin.Mechanical Properties of Carbonaceous Slate[J].Journal of Geological Hazards and Environment Protection,2011,22(1):84-86
[7]关宝树,赵勇.软弱围岩隧道施工技术[M].北京:人民交通出版社,2011,55-177Guan Baoshu,Zhao Yong.Construction Technology of Soft Rock Tunnel[M].Beijing:China Communications Press,2011,55-177
[8]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2008Guan Baoshu.Collection of Key Points in Construction of Tunnel Projects[M].Beijing:China Communications Press,2008
[9]黄志全,王晓睿.软弱隧道塌方机理及治理技术研究[M].北京:科学出版社,2012Huang Zhiquan,Wang Xiaorui.Study on Collapse Mechanism and Countermeasures for Soft Rock Tunnels[M].Beijing:Science Press,2012
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