软弱结构面对隧道围岩稳定性的影响研究  

Influence of Interface on Stability of Tunnel Openings in the Connection of Different Lithology

作　　者：丰正伟[1] 刘新荣[2] 傅晏[2] 胡敏云[1] 

机构地区：[1]浙江工业大学建筑工程学院,杭州310014 [2]重庆大学土木工程学院,重庆400045

出　　处：《地下空间与工程学报》2009年第4期745-749,共5页Chinese Journal of Underground Space and Engineering

基　　金：教育部新世纪优秀人才支持计划"(NCET-05-0763);国家863计划项目(2007AA11Z110)

摘　　要：运用FLAC 5.0有限差分软件对结构面穿过隧道开挖轮廓线并与水平线呈45度角的状态下,夹层两侧不同岩性关系的情况做数值模拟分析。数值分析采用FLAC特有的In-terface命令来模拟软弱夹层的接触面,能够准确地反映软弱夹层在隧道开挖过程中的力学特性。通过对开挖后的无衬砌隧道进行竖向位移、剪切应力、塑性区及围岩达到屈服状态时的位移矢量分析研究,总结出结构面两侧岩体上强下弱或下弱上强的状况下,围岩的力学特性和破坏模式;对隧道的选址、支护结构的设计和施工具有广泛的借鉴意义与指导作用。In the state of interface passingl through the tunnel excavation outline with an angle of 45 degrees relative to horizontal hne, a numerical simulation by FLAC5. 0 finite - difference software for the two sides of weak interlayer different hthology is given in this paper. The numerical analysis takes the command ＂Interface＂ specific to FLAC,to simulate interface,having a perfect expression of the weak interlayer mechanical characteristics. According to the research on the displacement in Y direction, shear stress, plastic zone and vector of displacement of tunnel without lining after excavation of the tunnel, the characteristics and failure mechanism of tunnel are summarized in the state of the interface with one side is strong and the other is weak. The results will be devoted to layout, supporting system design and construction of tunnel openings.

关 键 词：围岩稳定 结构面 岩性关系 数值分析 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]