强震区跨断层隧道减震缝减震技术研究-《高速铁路技术》

文章信息/Info

Title:: Study on Shock Absorption Technology of Shock Absorption Joint of Fault-crossing Tunnels in Meizoseismal Area

Author(s):: TU Han; NI Songzhi; ZUO Kuixian; 1. The 4th Engineering Co., Ltd.of China Railway Tunnel Group, Nanning 530003, China;
2. North China University of Technology, Beijing 100144, China

Keywords:: meizoseismal area|fault-crossing tunnel|shock absorption joint|seismic performance

摘要:: 为进一步提高强震区跨断层隧道的震时安全稳定性，文章依托某铁路隧道断层段，利用有限差分数值计算软件对减震缝的减震性能进行研究，对比分析了无减震缝、常规减震缝和交错设缝二衬结构的主应力及内力。研究结果表明：（1）跨断层隧道上盘结构受地震作用的影响大于下盘；（2）施设减震缝后，隧道衬砌结构轴力值、弯矩值明显降低，常规设缝和交错设缝的轴力最大降幅分别为54.4%、47.6%，弯矩最大降幅分别为41.9%、43.1%；（3）施设减震缝后，隧道衬砌结构的安全系数明显增大，常规设缝和交错设缝的最大增幅分别为54.3%、55.6%；（4）综上可知，施设减震缝可提高跨断层隧道结构的安全性及稳定性。

Abstract:: In order to further improve the seismic safety and stability of fault-crossing tunnel in meizoseismal area, based on the fault section of railway tunnel, the vibration reducing performance of the shock absorption joint is studied by using finite difference numerical calculation software, and the main stress and internal force of the second lining structure of the conventional damping joints and staggered joints and without shock absorbing joints are compared and analyzed. The results show that the influence of seismic action on the hanging wall structure of the fault-crossing tunnel is greater than that of the footwall. The axial force value and bending moment value of the tunnel lining structure are obviously reduced after the shock absorption joints are installed. The maximum decreasing amplitude of axial force for conventional joints and interlacing joints is 54.4% and 47.6% respectively, and the maximum decreasing amplitude of bending moment for conventional joints and interlacing joints is 41.9% and 43.1% respectively. The safety factor of tunnel lining structure increases obviously after the joints are installed, and the maximum amplification of conventional joints and staggered joints is 54.3% and 55.6% respectively. In conclusion, the application of the shock absorption joint can improve the safety and stability of the fault-crossing tunnel structure.