交叉隧道围岩收敛和应力分布规律研究  

Stress and Displacement Analysis of Surround Rock in Y-shape Tunnel

作　　者：林达明[1,2,3] 尚彦军[3] 柳侃[2] 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]国土资源部丘陵山地地质灾害防治重点实验室,福州350002 [3]中国科学院地质与地球物理所,北京100029

出　　处：《地下空间与工程学报》2012年第6期1153-1158,1177,共7页Chinese Journal of Underground Space and Engineering

基　　金：福建省地质灾害重点实验室开放基金项目;中央级公益性科研所基本科研业务费专项资金项目;国家重点基础研究发展规划(973)项目(No.2010CB732001)

摘　　要：交叉隧道数值模拟的研究很多,由于Y型隧道的设计施工复杂,目前还没有人进行数值研究。以南梁隧道中两条单线隧道合并为一条双线隧道的Y型交叉为背景,首先根据非线性Hoek-Brown准则得到岩体参数,然后用FLAC-3D根据该交叉段的施工方法进行三维数值计算,在不同的位置布置不同的观测面,探讨了单线隧道合并为双线隧道过程中各个观测面的变形破坏规律。综合多个观测面分析隧道开挖引起的位移、应力变化发现:随着单线隧道距离缩小,相互影响加剧,围岩压应力拉应力加大,位移变大,并且增加幅度渐渐变大,变化幅度最大为44.8%,合并为双线大概15 m后位移和应力都趋于稳定。There are many effective research works about tunnel simulation at home and abroad,because the complexity of design and construction for Y-shape tunnel,at present there is nobody do research about it yet.With the background of Nanliang-tunnel in which two single-beam merge into a two-lane tunnel as Y-shape one,this paper has obtained the rock mass mechanics parameters on the basis of nonlinear Hoek-Brown criterion first,and then a numerical simulation has been done according to the tunnel construction with FLAC-3D..We have arranged many monitor sections in this model and discussed the law of deformation and failure in different sections,at last had a comprehensive analysis of displacement,stress,plastic zone of different sites caused by tunnel construction and discovered that： with decrease of the distance of two single tunnels,the interaction caused by the merging increased together with the compressive stress and tensile stress.The displacements of surrounding rock increased accordingly,the amplitude of variation was up to 44.8%.Only in case that the merged two-lane tunnel over 15m long,the stress and displacements redistribution of surrounding rock become stable.

关 键 词：Y型交叉隧道 位移 应力 

分 类 号：TU921[建筑科学—建筑设计及理论]