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《Chinese Journal of Underground Space and Engineering》 2017-03
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Characteristics Analysis of Tunnel Face Extrusion Deformation in Weak Surrounding Rock

Zhu Zhengguo;Li Wenjiang;Liu Zhichun;Sun Minhlei;Wu Jie;School of Civil Engineering,Shijiazhuang Tiedao University;  
Weak surrounding rock is often encountered in the construction of tunnel,whose space large deformation feature is affected by length,height,construction method and ground stress condition etc.Spatial deformation characteristics of weak surrounding rock tunnel were analyzed in detail based on field monitoring and numerical simulation of Lanzhou-Chongqing railway Liangshui tunnel.The results show that:the weaker the surrounding rock is,the larger tunnel face vertical extrusion deformation and deformation rate are,the tunnel face extrusion deformation is affected more by the upper step excavation height and surrounding rock level than step length;Among the pre-deformation of cave,the crown settlement is more obvious than the horizontal convergence;when initial ground stress level increases,the tunnel face extrusion deformation will increase sharply.The research results can provide effective basis for the design and construction of tunnel.
【Key Words】: weak surrounding rock tunnel tunnel face extrusion deformation spatial deformation numerical simulation
【Fund】: 国家自然科学基金(51478277);; 河北省自然科学基金(E2016210018);; 河北省高校百名创新人才计划(Ⅲ)(SLRC2017054)
【CateGory Index】: U451
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