汽车荷载与河水耦合作用下公路边坡应力应变分析

摘要

In order to study the stability of bedding rock road slope under the coupling effect of vehicle load and water level change,the PLAXIS soft is used to analyze the stress-strain and stability characteristic of the slope rock in the process of river water level drop.The results show that:(a) the distribution range of slope shear strain is slighdy influenced by early precipitation and the impact of late precipitation is relatively larger,and the plastic range on slope surface is first decreased and then increased during river water level drop;(b) the safety coefficient of slope stability is first increased and then decreased during river water level drop,and when the water level drops to EL.580 m,the safety coefficient is maximum of 1.38;and (c) the pre-precipitation will cause obviously displacement of road platform,and the displacement will tend to stable during late precipitation.%为研究汽车荷载与河水位变化耦合作用下顺层岩质公路边坡的稳定性,基于有限元渗流基本理论,采用有限元软件PLAXIS,分析了河水下降过程中边坡岩体的应力应变特征及稳定性变化趋势.结果表明,边坡剪应变分布范围受前期降水影响较小,受后期降水影响相对较大,边坡表层塑性点范围随水位下降呈现先减小后增大的变化趋势;公路边坡稳定安全系数随水位下降呈现先增大后减小的变化趋势,当水面高程降到580 m时安全系数最大为1.38;前期降水导致公路平台位移变形明显,后期降水时变形趋于稳定.