摘要
隧道开挖后围岩的变形破坏机理对设计和施工具有重要意义。基于有限差分理论和颗粒流理论,建立二维平面隧道连续-离散耦合数值模型进行分析,分别利用FLAC^(2D)和PFC^(2D)构建连续区域与非连续区域,研究不同围压条件下隧道围岩的变形特性及破坏机制。结果表明:随着地应力的增长,围岩的变形逐渐加剧,裂纹数量逐渐增多,裂纹的产生先快后慢,从8 MPa到10 MPa地应力条件下的裂纹数量有一个突变的过程,断裂和塌陷主要集中在隧道顶部;围岩的变形和裂纹数量随侧压力系数的增大而增大,当侧压力系数小于1.0时,围岩破坏程度较轻,变形主要集中在隧道两侧;当侧压力系数大于1.0时,围岩的变形程度以及裂纹数量均出现明显增长,破坏主要集中在顶板和底板。
The deformation and damage mechanism of surrounding rock after tunnel excavation is of great significance for design and construction.Based on the finite difference theory and particle flow theory,a two-dimensional planar tunnel continuous-discrete coupling numerical model is established for analysis,and FLAC^(2D) and PFC^(2D) are used to construct the continuous region and discontinuous region respectively,to study the deformation characteristics and damage mechanism of the tunnel surrounding rock under different conditions of peripheral pressure.The study shows that:1)with the growth of ground stress,the deformation of surrounding rock gradually intensifies,the number of cracks gradually increases,the cracks are generated quickly and then slowly,and the number of cracks under the condition of ground stress from 8MPa to 10MPa has a sudden change,and the fractures and collapses are mainly concentrated in the top of the tunnel.2)The deformation of the surrounding rock and the number of cracks increase with the increase of the coefficient of lateral pressure.When the lateral pressure coefficient is less than 1.0,the damage degree of surrounding rock is light,and the deformation is mainly concentrated on both sides of the tunnel.When the lateral pressure coefficient is greater than 1.0,the deformation of the surrounding rock and the number of cracks increase significantly,and the damage is mainly concentrated in the top and bottom slabs.
作者
刘先声
刘洋
王蔚然
董瑾玥
LIU Xiansheng;LIU Yang;WANG Weiran;DONG Jinyue(Anhui Engineering and Technology Research Center for Urban Construction and Underground Space,Anhui Jianzhu University,Hefei 230601;School of Civil Engineering,Anhui Jianzhu University,Hefei 230601)
出处
《兰州工业学院学报》
2025年第1期35-40,共6页
Journal of Lanzhou Institute of Technology
基金
安徽省自然科学基金(2108085ME192)。
关键词
连续-离散耦合
不同围压
破坏
裂纹数量
continuous-discrete coupling
different confining pressures
destruction
number of cracks
作者简介
刘先声(1999-),男,安徽蚌埠人,硕士生;通讯作者:刘洋(1988-),男,安徽宿州人,副教授,博士,硕士生导师。
