Research on horizontal seismic force transmission mechanism and dynamic model test of tunnel overlying soil column
Cui Guangyao1 Ni Songzhi1 Wu Xiugang1 Wang Mingnian2 Lin Guojin3 Ma Junhui4
1. North China University of Technology， Beijing 100144, China
2. Southwest Jiaotong University， Chengdu 610031, China
3. Highway Planning, Survey, Design and Research Institute, Sichuan Provincial Communications Department, Chengdu 610041, China
4. Zhengzhou Engineering Co., Ltd., China Railway Tieqiju Civil Engineering Group, Zhengzhou 450052, China
Abstract：In order to change the status of unclear horizontal seismic force transmission mechanism for the overlying soil column in tunnel cross-sectional static earthquake-resistant calculation method, taking circular tunnel in surrounding rock of class Ⅴas example, the tunnel overlying soil column horizontal seismic force transmission mechanism was studied by using dynamic finite element method| further the static method was corrected and further the computation results were verified by using shaking table test. The results show that the tunnel in overlying soil column horizontal seismic force acts on the second liner upper arch ring in the form of uniform shear friction. The largest friction of the tunnel in overlying soil column horizontal seismic force spreading to the second lining structure is in 25 meters depth| the greater the intensity of earthquake generates greater force of friction， when the buried depth is less than 50 meters| the effect of earthquake intensity on friction force is small， when the buried depth is more than 50 meters， the effect of earthquake on the structure is very small， when the tunnel enter into buried depth state. Replaced the level of concentration correction static method with uniform shear friction， and checked， the results should be safe for static method of seismic results after correction， compared to the results of the original static method to calculate， it′s closer to dynamic calculation results. It can reflect the dynamic properties of the actual tunnel structure in the earthquake better. The Research results can provide reference for designing tunnel seismic fortification.
崔光耀 倪嵩陟 伍修刚 王明年 林国进 马军辉. 隧道上覆土柱水平地震力传递机制及动力模型试验研究[J]. 土木工程学报, 2016, 49(S2): 157-162.
Cui Guangyao Ni Songzhi Wu Xiugang Wang Mingnian Lin Guojin Ma Junhui. Research on horizontal seismic force transmission mechanism and dynamic model test of tunnel overlying soil column. 土木工程学报, 2016, 49(S2): 157-162.
