宋章, 蒋良文, 杜宇本, 张广泽. 2016: 成兰铁路软岩隧道大变形特征及成因机制探析. 工程地质学报, 24(s1): 11-16. DOI: 10.13544/j.cnki.jeg.2016.s1.002
    引用本文: 宋章, 蒋良文, 杜宇本, 张广泽. 2016: 成兰铁路软岩隧道大变形特征及成因机制探析. 工程地质学报, 24(s1): 11-16. DOI: 10.13544/j.cnki.jeg.2016.s1.002
    SONG Zhang, JIANG Liangwen, DU Yuben, ZHANG Guangze. 2016: ANALYSIS ON CHARACTERISTIC AND FORMATION MECHANISM OF LARGER DEFORMATION FOR THE TUNNEL OF CHENGDU-LANZHOU RAILWAY. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 11-16. DOI: 10.13544/j.cnki.jeg.2016.s1.002
    Citation: SONG Zhang, JIANG Liangwen, DU Yuben, ZHANG Guangze. 2016: ANALYSIS ON CHARACTERISTIC AND FORMATION MECHANISM OF LARGER DEFORMATION FOR THE TUNNEL OF CHENGDU-LANZHOU RAILWAY. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 11-16. DOI: 10.13544/j.cnki.jeg.2016.s1.002

    成兰铁路软岩隧道大变形特征及成因机制探析

    ANALYSIS ON CHARACTERISTIC AND FORMATION MECHANISM OF LARGER DEFORMATION FOR THE TUNNEL OF CHENGDU-LANZHOU RAILWAY

    • 摘要: 成兰铁路软岩隧道大变形具有衬砌开裂、钢架扭曲、隧道断面缩小等一般大变形的特点,更具有其区域特殊性,即成兰铁路穿越龙门山构造带、松潘甘孜褶皱构造带及西秦岭褶皱构造带三大构造单元的10条活动断裂,构造条件极为复杂活跃;全线70%的地层岩性为板岩、千枚岩、片岩及炭质板岩等软质岩,受构造影响,多表现出强烈的揉皱变形和挤压破碎,地层岩性条件极为软弱破碎;穿越汶川512强震区,地震波对岩体震裂损伤作用进一步降低软岩岩体的完整性、增强其透水性,汶川地震效应极为显著;构造应力环境极其复杂,高地壳应力的构造应力场特征明显。成兰铁路呈现以复杂的构造应力条件、软弱破碎的地层岩性条件、不利结构面组合的偏压现象及地下水软化效应等相互作用为主的大变形成因机制,可概括为应力作用下的松散型大变形、挤压性大变形及软岩结构型变形3种类型。本文研究结论对在建成兰铁路及类似工程地质条件下的隧道工程建设具有重要的指导意义。

       

      Abstract: The larger deformation of soft rock tunnel of the Chengdu-Lanzhou railway presented not only the common larger deformation characteristics, such as the lining crack, steel torsion, transect of tunnel reduced in size, and so on; but possessed the regional particularities of the tectonic conditions were intricate and active, for the Chengdu-Lanzhou railway pass through the following three tectonic elements of Longmen Mountain tectonic belt, Songpan-Ganzhi fold tectonic belt and west Qinling Mountains fold structural belt included 10active faults; of the formation lithology condition were extremely weak and cracked, for the 70 percent of rock mass of Chengdu-Lanzhou railway were soft rock of slate, phyllite, schist and carbon slate, suffered seriously by the tectonic and took on the intense crumpled deformation and strong crushing cracked; of the Wenchuan seismic effect were outstanding, for the Chengdu-Lanzhou railway run through the Wenchuan 512 meizoseismal area, the seismic wave damaged to rock mass, which resulted to reduce integrity of rock mass and increase water permeability of rock mass. The crustal stress field of Chengdu-Lanzhou railway were extremely complex, with the tectonic stress field characteristic of obvious high crustal stress. The formation mechanism of larger deformation of the Chengdu-Lanzhou railway were the interaction of the complex tectonic stress, soft and cracked formation lithology, bias of disadvantage discontinuous surface and softening effect of groundwater, summarized the three kinds of the loose large deformation, squeezed large deformation and structural large deformation in high stress field. And the conclusions of this paper is great guiding significance for the building Chengdu-Lanzhou railway and others tunnel construction in similar engineering geological conditions.

       

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