地震工程学报2016，Vol.38Issue(4)：519-524,6.DOI:10.3969/j.issn.1000-0844.2016.04.0519
仰坡坡度对隧道洞口段动力响应的影响分析
Influence of Slope Gradient on Dynamic Response in Portal Section of Tunnel
摘要
Abstract
Using dynamic finite element numerical simulation,in this study,we establish models with different slope gradients (α=30°,45°,60°,and 75°).The incident direction of a seismic wave is along the direction of the tunnel axis.As such,we studied the influence of different slope gradients on the dynamic response of the tunnel portal section and the front slope.By setting a contrast model,a pure slope without any tunnel,we examined the influence of a tunnel on the dynamic slope response.The results show that:(1 )In the presence of a free face,the displace-ment and acceleration of the portal section undergo an obvious amplification effect.The displace-ment peak values of different slope models are located in the section y=0 m (distance from the portal),and the displacement of each control point decreases rapidly 40 m from the entrance of the tunnel.(2)Along with the increase in slope gradient,the displacement value of the tunnel in the same section increases,and the deformation of the portal section also increases.(3)Whenα≥60°,with an increase in slope elevation,displacement increases;whenα<60°,with an increase in slope elevation,the displacement first increases and then decreases.The peak displacement of the slope appears at 0.4~0.6 of the slope height,which means that with an increase in slope gra-dient,peak displacement is closer to the top of the slope.(4)The existence of a tunnel has a sig-nificant influence on slope stability,which is particularly evident in the vicinity of the portal.关键词
黄土隧道/洞口段/仰坡坡度/动力响应Key words
loess tunnel/portal section/slope gradient/dynamic response分类
交通工程引用本文复制引用
王丽丽,吴志坚,梁庆国,孙文,王会娟..仰坡坡度对隧道洞口段动力响应的影响分析[J].地震工程学报,2016,38(4):519-524,6.基金项目
中国地震局地震预测研究所基本科研业务费专项(2016IESLZ04) （2016IESLZ04）
国家自然科学基金项目(41562013,41472297) （41562013,41472297）
甘肃省基础研究创新群体资助(145RJIA332) （145RJIA332）
