深部隧道开挖时空效应及其黏弹塑性分析  

Time-space effects and visco-elastoplastic analysis of deep tunnel excavation

作　　者：陈士海[1,2] 夏晓 彭陆强 涂兵雄[1] CHEN Shihai;XIA Xiao;PENG Luqiang;TU Bingxiong(College of Civil Engineering,Huaqiao University,Xiamen 361021,Fujian,China;Fujian Research Center for Tunneling and Urban Underground Space Engineering(Huaqiao University),Xiamen 361021,Fujian,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]福建省隧道与城市地下空间工程技术研究中心(华侨大学),福建厦门361021

出　　处：《隧道与地下工程灾害防治》2021年第1期12-21,共10页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金资助项目(51974136);爆炸冲击防灾减灾国家重点实验室开放课题资助项目(DPMEIKF201307)。

摘　　要：根据开挖面空间约束作用建立深部隧道几何计算模型,得到相应的应力场分布。选用西原模型模拟岩体的黏弹塑性,引入地质强度指标(geological strength index,GSI)及开挖扰动系数D,探讨不同地质指标及开挖扰动对隧道围岩位移的影响,分析围岩的变形机理,获得围岩的变形规律。分析指出:原岩应力越小、岩体质量越好、开挖扰动越小,第Ⅱ阶段蠕变变形速率越小;分析了开挖面推进速度对围岩位移的影响,推进速度越快,隧道围岩位移变化越剧烈;原岩应力较小时,推进速度不会影响围岩的最终位移。原岩应力较大时,推进速度越快,围岩位移越大。The geometric model of the deep tunnel was established according to the spatial constraint of the excavation face,and the corresponding stress field distribution was obtained. The visco-elasto-plasticity of the rock mass was simulated by the Nishihara model. The excavation disturbance( D) and geological strength index( GSI) were considered to analyze the rock deformation,access to the law of rock deformation. Results showed that the smaller the original rock stress,the better the quality of rock,the smaller excavation disturbance,the smaller creep deformation rate was in the phase II.In addition,the influence of the excavation surface advancing velocity on displacement of surrounding rock was also analyzed. The larger the advancing speed,the greater the changing intensity of the tunnel surrounding rock displacement. Advancing speed did not affect the ultimate displacement of surrounding rock when the original rock stress was relatively small. On the contrary,when the original rock stress was relatively large,the faster the advance speed,the greater the displacement of surrounding rock.

关 键 词：深部隧道 时空效应 黏弹塑性 开挖扰动 

分 类 号：O382.2[理学—流体力学]