地震动荷载作用下公路边坡永久位移  

Permanent displacement analysis of road slop under earthquake load

作　　者：贾兴利[1] 许金良[1] 武丽娜 韩跃杰[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]林同棪国际工程咨询有限公司,重庆401121

出　　处：《长安大学学报（自然科学版）》2014年第6期13-18,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：交通运输部西部交通建设科技项目(2009 318 000 102);中央高校基本科研业务费专项资金项目(CHD2011ZD021;2013G1211003)

摘　　要：针对地震动作用下影响公路边坡稳定性的关键因素,采用三维离散元动力响应分析方法,建立了公路边坡三维离散元模型,确定了动力计算的主要参数,选取不同坡高、坡度、岩层倾角以及不同地震波参数进行组合,研究了公路边坡在地震动荷载作用下永久动力位移的响应规律。研究结果表明：在坡高10~70m范围内,边坡的永久动力位移随坡高的增大而单调增大;边坡坡度在50°左右时永久位移达到最大;边坡位移随着地震波频率增加而减少,当频率超过10Hz时,边坡位移随频率的增加变化不大,趋于稳定;高烈度地震区路线边坡设计应控制边坡高度,避免50°左右的边坡坡度,宜选择小于30°的边坡设计;基于三维离散元的边坡永久动力位移分析方法计算结果准确可行。According to the key influencing factors of road slop stability under earthquake, the three-dimensional distinct element code model of road slop was set up by using dynamic response analysis method based on distinct element code, and the main parameters were defined. Different slope height, slope angle, rock inclination and seismic wave parameters were selected and com- bined, and the response disciplinarian of road slop permanent displacement under earthquake was studied. The results indicate that the permanent displacement of road slop increases with the in- crease slope height when the slope height is between 10 m and 70 m. The permanent displacement reaches the maximum while slope angle is about 50°. The larger seismic wave frequency is, the smaller slop displacement is. When the seismic wave frequency is larger than 10 Hz, slop dis- placement is stabilized. In high seismic intensity region, road slop height should be controlled, the slop angle smaller than 30° is appropriate. Therefore, the permanent displacement analysis method based on distinct element code is feasible. 6 tabs, 6 figs, 16 refs.

关 键 词：道路工程 地震 边坡 永久位移 三维离散元 

分 类 号：U416.14[交通运输工程—道路与铁道工程]