不同排水孔失效长度下岩溶隧道衬砌结构受力分析

发布时间：2018-06-27 01:51

本文选题：排水孔失效 + 隧道衬砌　；参考：《地下空间与工程学报》2017年S2期

【摘要】：在西南地区城市交通工程建设过程中,轨道交通隧道经常需穿越高水压富水地层。由于不同的隧道防排水设计理念对富水岩溶隧道衬砌外水压力及对隧址区生态环境和工程造成的影响差别较大,甚至可能导致衬砌结构破坏等问题。在"主动堵水,限量排放"隧道防排水设计理念下,以重庆市某轨道交通线中梁山隧道富水岩溶段为工程背景,采用FLAC3D有限差分软件分析了衬砌背后排水系统畅通性对隧道衬砌塑性区分布的影响,研究结果表明:随着排水孔失效长度的增加,二次衬砌背后的最大孔隙水压力增大,衬砌结构安全系数减小;塑性破坏区主要发生在仰拱区域,且在开挖后短时间内形成超静水孔隙水压力,引起该区段仰拱底部压力增大,可能导致隧道发生底鼓。
[Abstract]:In the process of urban traffic engineering construction in Southwest China, rail transit tunnels often need to cross high water pressure water rich strata. Because of different tunnel waterproof design concept, the external water pressure of the lining of the water rich karst tunnel and the impact on the ecological environment and engineering of the tunnel site are very different, and even may lead to the failure of the lining structure. Under the concept of tunnel anti drainage design, under the concept of tunnel waterproof and drainage design, the water rich Karst Section of Liangshan tunnel in a railway traffic line in Chongqing is taken as the project background. The influence of the smooth flow of the drainage system behind the lining on the plastic zone distribution of tunnel lining is analyzed by the FLAC3D finite difference software. The results show that with the increase of the failure length of the drainage hole, the results show that the failure length of the drainage hole is increased. In addition, the maximum pore water pressure behind the two lining increases, and the safety factor of the lining structure decreases. The plastic failure area mainly occurs in the inverted arch area, and the pore water pressure of the super still water is formed in a short time after the excavation, which causes the pressure of the bottom arch at the bottom of the section to increase, which may lead to the floor drums of the tunnel.
【作者单位】：北京城建设计发展集团股份有限公司;重庆大学土木工程学院;中国中铁二院工程集团有限责任公司;
【分类号】：U451.4

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