含夹层层状软岩隧道围岩变形特征分析  

Analysis of Surrounding Rock Deformation Characteristics of Layered Soft Rock Tunnel with Interlayer

作　　者：吴美琴[1] 陈赓 何君 田正忠 张蓓 WU Mei-qin;CHEN Geng;HE Jun;TIAN Zheng-zhong;ZHANG Bei(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Shaanxi Branch of Jiangxi Dongtong Transportation Technology Co.,Ltd.,Xianyang,Shaanxi 712000,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]江西东通交通科技股份有限公司陕西分公司,陕西咸阳712000

出　　处：《黑龙江交通科技》2023年第12期102-106,共5页Communications Science and Technology Heilongjiang

基　　金：江西省自然科学基金项目(20202BABL204057);江西省教育厅科技项目(GJJ210617)。

摘　　要：为研究夹层的位置及厚度对层状软岩隧道围岩变形的影响,以具有典型层状构造的彭家寨隧道为工程背景,通过现场监测与数值仿真相结合的方法,首先分析了层状软岩的层面倾角、层面间距对隧道围岩变形的影响,进而选取合适的层面倾角和层面间距分析了各关键节点的位移随夹层位置及夹层厚度的变化规律。结果表明:隧道开挖过程中,隧道围岩的变形主要经历了快速增长阶段、减缓增长阶段和趋于稳定阶段;当层面倾角不为0°和90°时,围岩的变形呈明显的非对称性,顺倾侧边墙的位移明显大于逆倾侧;当层面间距从1 m增加到9 m时,拱顶竖向位移逐渐减小,且减小的速率不断降低;当围岩中存在夹层时,隧道洞周各点的位移大幅增加,夹层越靠近隧道,夹层越厚,围岩的变形越大。In order to study the influence of the location and thickness of interlayer on the surrounding rock deformation of layered soft rock tunnel,Pengjiazhai tunnel is taken as the engineering background.Through the combination of field monitoring and numerical simulation,the influence of the dip angle and interlayer spacing of layered soft rock on the surrounding rock deformation of tunnel is analyzed,and then the appropriate dip angle and interlayer spacing are selected to analyze the variation of the displacement of key nodes with the location and thickness of interlayer.The results show that in the process of tunnel excavation,the deformation of tunnel surrounding rock mainly experiences the rapid growth stage,slow growth stage and stable stage.When the dip angles are not 0°and 90°,the deformation of the surrounding rock is obviously asymmetric,and the displacement of the side wall along the dip is significantly greater than that of the side wall along the reverse dip.When the layer spacing increases from 1 m to 9 m,the vertical displacement of the vault decreases gradually,and the decreasing rate slows down.When there is interlayer in the surrounding rock,the displacement of each point around the tunnel increases greatly.The closer the interlayer is to the tunnel,the greater the deformation of the surrounding rock is.

关 键 词：软岩隧道 层状岩体 软弱夹层 围岩变形 

分 类 号：U455[建筑科学—桥梁与隧道工程]