跨断层隧道动力特性大型振动台试验研究  

Experimental study on the dynamic characteristics of a tunnel-crossing fault using a shake-table test

作　　者：刘云[1,2] 高峰[1] 

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆工业职业技术学院建筑与环境工程学院,重庆401120

出　　处：《振动与冲击》2016年第12期160-166,共7页Journal of Vibration and Shock

基　　金：国家重点研究发展计划(973)项目资助(2011CB013600);国家自然科学基金资助(51178490);山区桥梁与隧道工程国家重点实验室培育基地(重庆交通大学)开放基金(CQSLBF-Y14-14);重庆市研究生科研创新项目(CYB15108);重庆工业职业技术学院校级科研项目(GZY201507-ZK)

摘　　要：通过与普通隧道进行振动台对比试验,探讨了跨断层隧道的地震响应规律及破坏特点,分析了衬砌裂缝的发展过程、加速度响应、应变大小以及围岩动土压力分布规律。试验结果表明:1从应变和破坏现象上看,断层隧道的横断面破坏程度远大于纵向;2强地震作用下断层隧道接缝处将产生较大的错动,接缝的错动极大影响隧道安全;3衬砌围岩动土压力具有两侧大、上下小的特点,临近破坏时隧道加速度响应将发生突变;4衬砌不同位置裂缝的产生和发展方向并不相同,顶部和底部由内向外发展,腰部两侧由外向内发展。以上试验研究结果可为断层隧道的抗震设计提供参考。Through comparison by means of shake-table tests between common tunnels and cross-fault tunnels,the seismic response law and failure characteristics of the cross-fault tunnels were discussed. Besides this,the developing process of the lining cracks,the acceleration response,the strain magnitude and the distribution regularities of surrounding rock pressure in these tunnels were investigated. The comparative results show the following characteristics: 1 Judging from the strain and damage phenomenon,the cross-sectional extent of the fault tunnel is much larger than that in the longitudinal direction. 2 When encountering strong earthquakes,large dislocations will emerge at the construction joints,and joint dislocation will greatly affect the security of the tunnel. 3 The surrounding rock pressure of the lining is bigger at the waist and smaller at the top and bottom,while the acceleration response of the tunnel will occur as a mutation near the destruction. 4 The generation position and development direction of different lining location cracks are not the same.The cracks at the top and bottom will grow from the inside to the outside. However,those at the two sides will grow in the opposite direction. The above analytical results can provide beneficial reference for seismic design of the cross-fault tunnels.

关 键 词：断层隧道 裂缝 加速度响应 应变 围岩动土压力 

分 类 号：U45[建筑科学—桥梁与隧道工程]