数值模拟交通荷载作用下黄土边坡动力响应研究  

Study on the dynamic response characteristics of loess slope under traffic load based on numerical modelling

作　　者：杜国梁 刘俊江 丛璐 谷丽莹 乐婧瑜 王闫超 DU Guoliang;LIU Junjiang;CONG Lu;GU Liying;LE Jingyu;WANG Yanchao(School of Urban Geology and Engineering,Hebei GEO University,Shijiazhuang,Hebei 050031,China;Hebei Provincial Technology Innovation Center for Intelligent Development and Control of Underground Artificial Environment,Shijiazhuang,Hebei 050031,China;School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan,Shanxi 030006,China;Shanxi Transportation Technology Research&Development Co.Ltd.,Taiyuan,Shanxi 030021,China)

机构地区：[1]河北地质大学城市地质与工程学院,河北石家庄050031 [2]河北省地下人工环境智慧开发与管控技术创新中心,河北石家庄050031 [3]山西大学电力与建筑学院,山西太原030006 [4]山西省交通科技研发有限公司,山西太原030021

出　　处：《中国地质灾害与防治学报》2024年第5期59-66,共8页The Chinese Journal of Geological Hazard and Control

基　　金：河北省教育厅科学研究项目(ZD2022094);山西省科技厅基础研究项目(202203021222428;202303021212009);国家自然科学基金项目(41941017;42277166)。

摘　　要：为了研究黄土边坡在交通荷载作用下的动力响应规律,文章采用有限差分软件建立典型黄土边坡数值模型,对边坡变形以及不同轴载、不同速度车辆荷载作用下边坡表面和内部的竖向最大加速度、速度和位移的变化规律进行分析,结果表明:施加交通荷载后,边坡剪应变增量带由坡脚向坡顶延伸发展,有发展为潜在滑移面的可能,且边坡失稳最先从坡脚处剪切破坏开始;随着与荷载源距离逐渐增加,边坡表面和内部各监测点的竖向最大加速度、速度和位移逐渐减小;在相同速度不同轴载情况下,随着轴载的不断增大,边坡表面和内部各监测点的竖向最大速度、加速度和位移都呈增大趋势;在固定轴载不同速度情况下,坡体内部和表面各监测点的竖向最大加速度和速度随着车速的增加,基本上呈增大的趋势,位移则随着行车速度的增加而逐渐减小。研究成果对认识交通荷载对黄土边坡的动力响应以及黄土地区道路施工具有重要的理论意义和工程应用价值。This study aims to explore the dynamic response of loess slopes under traffic loads.By using finite difference software,a comprehensive numerical model of a typical loess slope was established.The analysis focused on understanding variations in slope deformation,vertical maximum acceleration,velocity,and displacement on the surface and inside of the slope under different axle loads and vehicle speeds.The results show that after applying traffic load,the shear strain increment zone of the slope extends from the toe to the crest.This extension indicates a potential development of the slip surface,and the instability of the slope begins with shear failure at the toe.As the distance from the load source increases,the vertical maximum acceleration,velocity,and displacement at each monitoring point on the surface and inside of the slope gradually decrease.Under the same speed and different axle load conditions,as the axle load increases,the vertical maximum velocity,acceleration,and displacement at each monitoring point on the surface and inside of the slope all show an increasing trend.Under fixed axle load and different speed conditions,the vertical maximum acceleration and velocity at each monitoring point inside and on the surface of the slope generally increase with the increase of vehicle speed,while the displacement gradually decreases with the increase of driving speed.The research findings have important theoretical significance and practical engineering application value for understanding the dynamic response of loess slopes to traffic load and road construction within loess regions.

关 键 词：黄土边坡 交通荷载 动力响应 数值模拟 

分 类 号：P649[天文地球—地质矿产勘探]