1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Department of Civil Engineering, Logistical Engineering University, Chongqing 40041, China
Abstract：In order to verify the impact of stress concentration phenomenon at the feet of vertical ridge loess tunnel (hole) on the rock structure safety factor, in this paper, according to the static and dynamic analysis model, and using the shear strength reduction method and the ANSYS software, and being based on the existing study results, the change laws of plastic zone and safety factor are analyzed under the action of gravity and seismic when the angles are right at the feet of vertical ridge loess tunnel (hole), and through numerical examples the change laws of rock structure safety factor are studied when the angles are arc that the radius is different. The results shows that: the plastic zone under the gravity action firstly appears at upper foot of vertical ridge loess tunnel (hole), the stress concentration phenomenon of right angle has no effect on wall rock safety factor, and the plastic zone under earthquake action firstly appear at the right foot of vertical ridge unlined loess tunnel (hole), but the decrease of safety factor is’ t the reason of stress concentration phenomenon. And so a theory basis will be provided for the loess tunnel forming and engineering application.
程选生;田瑞瑞;郑颖人. 直墙式黄土隧道围岩结构的地震动稳定性分析——底脚处应力集中对安全系数的影响[J]. , 2011, 30(11): 214-218,.
Cheng Xuan-sheng;Tian Rui-rui;Zheng Ying-ren. Earthquake wall rock stability analysis of vertical ridge loess tunnel——the impact of stress concentration at the feet of tunnel on the safety factor. , 2011, 30(11): 214-218,.
2011, Vol. 30 
