穿越活动断裂带螺旋隧道抗错性能模型试验研究  

Model test research on anti-dislocation performance of spiral tunnels crossing active fault zones

作　　者：王天强 耿萍[1,2] 何川[1,2] 王琦[1,2,3] WANG Tianqiang;GENG Ping;HE Chuan;WANG Qi(State Key Laboratory of Intelligent Geotechnics and Tunnelling,Southwest Jiaotong University,Chengdu,Sichuan 610031;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学极端环境岩土和隧道工程智能建养全国重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031 [3]西南交通大学力学与航空航天学院,四川成都610031

出　　处：《岩石力学与工程学报》2024年第11期2738-2752,共15页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(52130808);国家资助博士后研究人员计划(GZB20230614)。

摘　　要：我国西部山区螺旋隧道穿越活动断裂带时,断层位错作用对隧道的影响十分显著。为明确正断层作用下跨断层螺旋隧道的结构位错响应特性,考虑螺旋隧道关键几何参数与土体-结构相对刚度比,采用模型试验方法开展了3组坡度3%下不同曲率半径的螺旋隧道抗错性能试验。随后采用具有一定承载能力的橡胶-钢筋柔性接头,探讨螺旋隧道在柔性接头措施下的结构位错特性,对比分析有/无柔性接头螺旋隧道抗位错适应性。结果表明:断层面及断层-活动盘交界面附近隧道受正断层影响较大,隧道仰拱最为不利。螺旋隧道拱腰部位随断层位错水平增加时的应变增量与其曲率半径有关,曲率半径较小的螺旋隧道拱腰处的环向应变和拱顶、仰拱部位的纵向应变对断层位错作用更为敏感。在橡胶-钢筋柔性接头构造措施下,螺旋隧道的节段式设计对断层位错具有良好的适应性,尤其对隧道仰拱部位的应力减小更为显著。研究结果可为我国西部山区穿越活动断裂带螺旋隧道的适应断层抗错设计提供研究参考。The fault dislocation effect on the tunnel is of significance when a spiral tunnel crosses active fault zones in the western regions of China.In order to clarify the dislocation response of fault-crossing spiral tunnels subjected to the normal faulting,three groups of model tests with different radius of curvature with the longitudinal slope of 3%were performed experimentally,where the critical design parameters of spiral tunnels and the relative stiffness ratio of soil-structure were considered.And then,a rubber-steel flexible joint with certain flexural bearing capacity was utilized on spiral tunnel to explore the anti-dislocation response of tunnel.The performances of tunnel with or without flexible joint measures were subsequently compared and analyzed.The results show that the tunnel near the fault plane and the interface of fault zone and hanging wall are affected by the normal faulting and the tunnel invert is more adverse.The incremental strain at the haunch of the spiral tunnel with the increase of fault dislocation is related to the radius of curvature.The circumferential strain at the haunch with a small radius of curvature and the longitudinal strain at the tunnel crown and invert are more sensitive to the fault dislocation.Affected by the rubbersteel flexible joints with certain bearing capacity,the segmental design of spiral tunnel plays a good adaptability to fault dislocation,especially for the stress reduction on the tunnel invert.The research results can provide a design reference for the fault-crossing spiral tunnels to adapt the fault dislocation in western mountainous areas of China.

关 键 词：隧道工程 隧道曲率 活动断裂带 纵向坡度 四点弯曲试验 抗错措施 

分 类 号：U45[建筑科学—桥梁与隧道工程]