多年冻土区拓宽路堤的阴阳坡效应与地震反应

Shady-Sun Slope Effect and Seismic Response of Widened Highway Embankments in Permafrost Areas

为研究冻土路堤拓宽后的阴阳坡效应和地震反应差异,以青藏地区多年冻土环境为研究背景,综合考虑了气温变化、太阳辐射、风速和对流换热等边界条件对冻土路堤温度场的影响,建立了有限元模型,通过有限元分析软件Abaqus分析了路堤加宽前后的温度场变化规律。通过原始路堤和加宽路堤各月份的路堤温度场结果,对路堤模型进行了区域划分和材料填充,分析了地震荷载作用下路堤的加速度响应和位移响应。结果表明:在不考虑加宽路堤材料和路堤搭接方式对路堤加宽的影响下,相比于原始路堤,加宽路堤并未对路堤阴阳坡效应产生放大作用,并且阴阳坡效应不会对地震反应差异产生影响。

In order to study the differences in the shady-sun slope effects and seismic responses of widened permafrost embankments,considering the Qinghai-Tibet region as the background of the study,the influence of boundary conditions such as temperature changes,solar radiation,wind speed,and convective heat transfer on the temperature field of permafrost embankments was comprehensively considered.A finite element model was established,and the temperature field changes before and after widening of the embankment were analyzed using the finite element analysis software Abaqus.By the result of embankment temperature fields for each month,the embankment model was divided into re-gions and filled with materials,and the acceleration response and displacement response of the embank-ment under seismic loads were analyzed.The results show that under the condition of not considering the influence of embankment widening materials and embankment jointing methods on the embankment widening,compared with the original embankment,the widened embankment did not amplify the Yin and Yang slope effects of the embankment,and the shady-sun slope effects did not influence the differ-encesin seismicresponse.