摘要
为了揭示交通超载车辆荷载引发或加剧黄土边坡失稳的机制,通过共振柱试验研究了不同动荷载条件下黄土的动力特性。基于此,建立黄土边坡动力分析模型,分析超载车辆荷载作用下边坡的动态响应规律。结果表明:当车速一定时,位移、速度、加速度响应随交通车辆轴载的增加近线性增大。当轴载不变时,车速在30~50 km/h之间易引起边坡土体的共振响应。在低速、超载行驶的交通车辆荷载作用下,易产生不利于黄土边坡稳定的动态响应,相对于下坡面,上坡面更易失稳。
In order to reveal the mechanism of instability of the Loess slope induced by the overload vehicle,the dynamic characteristics of loess under different dynamic loads are studied by means of the resonant column test.Based on this,a dynamic analysis model of the loess slope is established,and the dynamic response of the slope under the action of an overload vehicle load is analyzed.The results show that when the speed is certain,the displacement,velocity and acceleration response to the vehicle axle load linear increases with the increase of the vehicle axle load.When the axial load is constant,overload vehicle at the speed of 30~50 km/h can easily cause resonance response of slope soil.Under the action of low speed and over loading vehicle,the dynamic response of the loess slope is not conducive to the stability of the loess slope.Compared with the lower slope,the upper slope is apt to be instable easily.The research results have important theoretical significance and engineering application value for the stability evaluation of loess slope and the long-term safety of highway subgrade.
作者
李论基
韩金良
赵天宇
李小智
李小林
LI Lunji;HAN Jinliang;ZHAO Tianyu;LI Xiaozhi;LI Xiaolin(Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730030,China;Institute of Geomechanics,Chinese Academy of Geological Science,Beijing 100081,China)
出处
《路基工程》
2018年第A01期48-54,共7页
Subgrade Engineering
基金
中国地质调查局地质矿产调查评价项目(12120113008500)
科技支撑项目课题(2012BAK10B02)
甘肃省科技重大专项(1302GKDA009)
关键词
黄土边坡
循环荷载
黄土动力学特性
动态响应
数值分析
loess slope
cyclic load
dynamic characteristics of loess
dynamic response
numerical analysis
