山岭隧道衬砌背后空洞对衬砌结构多因素影响分析  

Analysis of the Multiple Influencing Factors of the Voids Behind Mountain Tunnel Lining on the Lining Structure

作　　者：刘颖[1] 

机构地区：[1]无锡太湖学院,江苏无锡214000

出　　处：《水利与建筑工程学报》2015年第2期222-230,共9页Journal of Water Resources and Architectural Engineering

摘　　要：山岭隧道衬砌背后存在空洞时,针对空洞的大小、空洞的深度、空洞的位置、围岩级别等不同因素,采用有限元平面应变模型模拟计算对隧道衬砌结构应力和应变的影响。计算结果表明:空洞的产生导致了围岩应力的重分布;随着空洞不断增大,围岩松弛逐步严重;空洞深度较小时,应力集中现象小;空洞深度较大,应力集中越明显;在不同部位产生空洞,隧道均受到偏压作用;围岩级别越低衬砌结构产生空洞后,所面临的损坏风险更大;隧道衬砌变形形状从扁平状向空洞产生部位的钟形变化。On the occasion of the existence of voids behind the mountain tunnel lining, by adopting finite element plane strain model, the stress and strain of the tunnel lining structure were calculated in view of different factors such as void size, void depth, void position and surrounding rock grade. The results indicate that void leads to the redistribution of surrounding rock stress; with the increasing of the void size, the surrounding rock relaxation gradually deteriorates; when void depth is smaller, the stress concentration is not significant, whereas when the void depth is larger, the stress con- centration is more obvious; with the different location of the voids, the tunnel is subject to bias effect without exception; the lower the grade of the surrounding rock, the bigger the damage risk it faces when the void behind tunnel lining ap- pears; the deformation shape of the tunnel lining changes from fiat to bell-shaped towards the location of the void

关 键 词：山岭隧道 衬砌结构 应力和应变 空洞 不同因素 

分 类 号：U456[建筑科学—桥梁与隧道工程]