地震力作用下浅埋双侧偏压隧道松动的围岩压力  

Loosening earth pressure of shallow bilateral bias tunnel under earthquake force

作　　者：李栋梁[1] 刘新荣[1] 杨欣[1] 王震[1] 袁文[1] LI Dongliang LIU Xinrong YANG Xin WANG Zhen YUAN Wen(Key Laboratory of New Technology for Construction of Cities in Mountain Area, School of Civil Engineering, Chongqing University, Chongqing 400045, Chin)

机构地区：[1]重庆大学土木工程学院,山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《中南大学学报（自然科学版）》2016年第10期3483-3490,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41372356);教育部“新世纪优秀人才支持计划”项目(NCET-05-0763)~~

摘　　要：为了研究水平和竖向地震荷载同时作用时浅埋双侧偏压隧道松动围岩压力的分布,以拟静力法为基本研究方法,推导浅埋双侧偏压隧道围岩松动压力的解析解。根据推导的公式对在水平和竖向地震荷载同时作用时隧道两侧的破裂角的变化规律进行研究。研究研究表明:围岩级别越高,破裂角越小;地面坡度越大,破裂角越大;随着地震烈度增加,隧道两侧的破裂角的变化趋势完全相反,可根据水平地震力的方向或地震力偏角的方向进行判断;对于围岩较差的Ⅴ和Ⅵ级围岩隧道,给出抗震设防烈度分别为Ⅵ,Ⅶ,Ⅷ和Ⅸ度时破裂角加固范围。To explore the distribution law of loosening earth pressure of shallow bilateral bias tunnel with the horizontal and the vertical seismic force, the analytical solutions of loosening earth pressure of shallow bilateral bias tunnel were derived by pseudo-static method. Based on the derived formula, the changing rules of the crack angle on the both sides of the tunnel were researched. The results show that the crack angle of the shallow bilateral buried tunnel decreases with the increase of the surrounding rock grade. But the higher the land slope, the larger the break angle of the shallow bilateral buried tunnel. With the increase of the earthquake intensity, one crack angle decreases, but the other increases, which should be judged by the direction of horizontal seismic force or deflection angle of the earthquake force. As for the tunnel of which the surrounding rock is poor, such as V and VI class surrounding rock, the suggestions about reinforce range of the crack angle are given according to the different seismic fortification intensities（VI,Ⅶ,Ⅷ and Ⅸ）.

关 键 词：拟静力法 地震力 双侧偏压隧道 破裂角 松动围岩压力 

分 类 号：U455[建筑科学—桥梁与隧道工程]