Study on the dynamic response characteristics of loess slope under traffic load based on numerical modelling
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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。
Abstract: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.
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Key words:
- loess slope /
- traffic load /
- dynamic response /
- numerical modelling
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表 1 斜坡体物理力学参数表
Table 1. Physical and mechanical parameters of the slope
岩土体 天然密度
/（kg·m−3）黏聚力
/kPa内摩擦角
/（°）体积模量
/MPa剪切模量
/MPa道路 2500 − − 600 360 斜坡体 1850 15 18 16.67 7.69 
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