节理岩体中TBM掘进施工围岩稳定性及可视化分析  

Analysis and 3D Visualization of Surrounding Rock Stability during TBM Tunnelling in Jointed Rock Masses

作　　者：张子新[1,2] 王帅峰 黄昕[1,2] ZHANG Zixin;WANG Shuaifeng;HUANG Xin(Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092;Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092)

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《现代隧道技术》2018年第2期36-43,64,共9页Modern Tunnelling Technology

基　　金：国家973基础研究发展计划资助项目(2014CB046905);国家自然科学基金资助项目(41172249)

摘　　要：节理岩体的地质赋存特征含岩体结构、原岩应力场和地下水三方面,由此产生诸如破碎带、大变形软岩、富水带等恶劣的工程地质条件。TBM在节理岩体中掘进受到岩体地质特征和工程地质条件的影响,同时也对岩体造成一定的扰动,可能将导致隧道围岩发生失稳。另外,地质勘探不到位、掘进机选型不当等因素也会导致或促进围岩发生失稳。TBM掘进围岩失稳的形式主要有开挖面失稳和洞周失稳,以及二者兼有的大型围岩失稳。为了更直观地观察TBM掘进围岩失稳,文章采用自主研发的块体理论分析软件BLKLAB对节理岩体进行三维可视化建模,模拟TBM隧道开挖,并根据块体理论计算分析得到了开挖面和洞周的可动块体和关键块体。The intrinsic geological characteristics of a jointed rock mass include rock mass structure, in-situ stress of the primary rock mass and groundwater, which results in unfavorable geological conditions like fracture zones, soft rocks with large deformation and zones with abundant groundwater. TBM driving in the jointed rock mass is affected by these rock mass characteristics and geological conditions, while the rock mass is disturbed by the TBM construc- tion, leading to instability of the surrounding rock. Unfavorable factors such as improper geological exploration and inappropriate selection of TBM types can also trigger or facilitate instability of the surrounding rock. The instability of rock masses may occur in front of the excavation face or around the periphery of the tunnel, or a combination of the two. A 3D visualization model of a jointed rock mass is established to simulate TBM tunnefing in jointed rock masses using the developed software package BLKLAB based on block theory. Removable blocks and key blocks of surrounding rock on the excavation face and around tunnel periphery are identified.

关 键 词：TBM掘进 BLKLAB 块体理论 围岩稳定 节理岩体 可视化 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]