衬砌背后空洞对浅埋隧道结构稳定性的影响  

Effect of voids behind lining on structural stability of shallow buried tunnels

作　　者：耿璐莹 臧万军 张丙强 GENG Luying;ZANG Wanjun;ZHANG Bingqiang(Key Laboratory of Underground Engineering in Colleges and Universities of Fujian Province,Fuzhou 350118,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]地下工程福建省高校重点实验室,福建福州350118 [2]福建理工大学土木工程学院,福建福州350118

出　　处：《福建理工大学学报》2023年第6期511-516,550,共7页JOURNAL OF FUJILAN UNIVERSITY OF TECHNOLOGY

摘　　要：利用Abaqus有限元软件进行三维弹塑性模拟分析,研究不同大小、不同位置的空洞对浅埋隧道衬砌结构变形、应力、安全系数以及围岩应力、压力的影响。结果表明:无论空洞在什么位置,围岩最大主应力一般随空洞增大而增大,最大变化幅度为69.1%;围岩压力的变化主要集中在空洞及周围,最大变化率可达90%,其他控制点处变化率不超1.5%;衬砌位移均随空洞增大而增大,其变化幅度由大到小依次为“X>Y>Z”;衬砌最大主应力一般随空洞增大先减小后增大,变化幅度最大可达57.8%;衬砌安全系数随空洞增大而减小,拱脚处空洞出现最小值2.9。Three-dimensional elastoplastic simulation analyses were conducted using Abaqus finite element software to investigate the effects of voids of different sizes and positions on the deformation,stress distribution,safety factor,as well as the stress and pressure in the surrounding rock for shallow-buried tunnel lining structures.Results indicate that,irrespective of the void’s location,the maximum principal stress in the surrounding rock generally increases with increasing void size,with a maximum variation of 69.1%.Pressure variations in the surrounding rock are primarily concentrated around the void and its vicinity,with a maximum variation rate of up to 90%,while at other control points,the variation rate does not exceed 1.5%.Lining displacements increase with the increase of voids,with the change magnitude in the order of“X>Y>Z”.The maximum principal stress in the lining structure typically decreases and then increases with increasing void size,with a maximum variation of 57.8%.The safety factor of the lining decreases with increasing void size,reaching a minimum value of 2.9 at the void near the arch foot.

关 键 词：空洞 隧道 稳定性 衬砌 

分 类 号：U451[建筑科学—桥梁与隧道工程]