膨胀围岩隧道不同含水率的数值分析  

Numerical Analysis of Different Moisture Content in Expansive Surrounding Rock Tunnel

作　　者：杨军平 赵卫洁[1,2] 赵文兰 

机构地区：[1]广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]广西贺州市住房和城乡建设局,广西贺州542800

出　　处：《科技创新与应用》2018年第10期1-4,7,共5页Technology Innovation and Application

基　　金：国家自然科学基金资助项目"炎热多雨环境下膨胀围岩隧道施工的时变力学性态"(编号:51368014)

摘　　要：为了探究膨胀围岩隧道在不同含水率条件下隧道开挖过程中膨胀围岩的受力情况。文章以广西某高速公路膨胀围岩隧道项目为依托工程,结合本课题组相似模型试验,利用大型有限元软件ANSYS的温度应力场模块和结构分析模块的耦合作用来模拟含水率变化的条件下,膨胀岩隧道开挖的力学性态。数值分析结果显示:不同含水率条件下,随着含水率的增大,围岩位移,围岩应力增大,随着含水率越接近饱和含水率,围岩位移、应力增大的梯度越大;由围岩位移、应力云图可知拱顶、两侧拱腰拱底两侧的位移和应力变化最大,出现应力集中,为设计施工中薄弱点,要重点监测。In order to investigate the stress of expansive surrounding rock in the process of tunnel excavation under different moisture contents,the stress of the expansive surrounding rock tunnel is studied.Based on the project of expansive surrounding rock tunnel of a highway in Guangxi,this paper combines the similar model test of our group in research.The mechanical behavior of expansive rock tunnel excavation is simulated by the coupling of the thermal stress field module and the structure analysis module of the large-scale finite element software ANSYS.The numerical results show that with the increase of moisture content,the displacement of surrounding rock and the stress of surrounding rock increase with the increase of moisture content,and the gradient of displacement and stress of surrounding rock increases with the moisture content approaching saturated water content.According to the displacement and stress cloud map of surrounding rock,the displacement and stress change of arch roof and arch bottom of both sides of arch waist are the biggest,and the stress concentration appears,which are the weak points in design and construction and it is necessary to focus on monitoring.

关 键 词：膨胀围岩 耦合作用 含水率变化 围岩位移 围岩应力 

分 类 号：U451[建筑科学—桥梁与隧道工程]