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。
In the construction of urban traffic engineering in Southwest China,the rail transit tunnel often needs to pass through the high water pressure and rich water formation. Because of the different design concepts of tunnel waterproof and drainage,the water pressure in the lining of the water filled karst tunnel and the influence on the ecological environment and engineering of the tunnel site are different greatly,which may even lead to the destruction of the lining structure. Under the 'active water plugging,limited drainage drainage'tunnel design concept,taking Chongqing city rail transit line in zhong liangshan section of water rich karst tunnel as the engineering background,using FLAC3 D software to analyze the unblocked drainage system behind the lining of the plastic zone distribution of tunnel lining. The results show that with the increase of the drainage hole failure length,the maximum pore water pressure increases two times behind the lining,the safety factor of lining structure reduces; plastic zone occurs mainly in the area of arch back,and the formation of excess hydrostatic pore water pressure in a short time after the excavation,the section invert bottom pressure,may cause the tunnel bottom drum.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第S2期833-839,共7页
Chinese Journal of Underground Space and Engineering
关键词
排水孔失效
隧道衬砌
稳定性分析
drain hole failure
tunnel lining
stability analysis
