摘要
为分析降雨入渗对路基边坡稳定性的影响,考虑渗流场与应力场间的耦合作用,依据强度折减方法,运用有限元软件分析了降雨、路基几何形状及路基土物理性能对边坡稳定性的影响。结果表明:降雨强度越大、降雨历时越长,路基变形位移越大,边坡稳定安全系数减小;长时小雨造成的路基沉降较大,边坡容易失稳;路基边坡越陡,路基变形位移较小,但边坡稳定性较低;路基土渗透系数越大,路基变形位移越大,边坡稳定性降低。
In order to analyze the influence of rainfall infiltration on the stability of subgrade slope,in this paper,considering the coupling effect between seepage field and stress field,the effect of rainfall,subgrade geometry shape and physical properties of subgrade soil on slope stability was analyzed by finite element software based on strength reduction method.The results show that the larger the rainfall intensity and duration,the greater the deformation displacement of subgrade is,but the smaller the safety factor of slope stability is.Long-time light rain causes larger subgrade settlement and the slope is prone to unstable.The steeper the subgrade slope,the smaller the deformation displacement of subgrade is,but the slope stability is lower;the greater the permeability coefficient of subgrade soil,the greater the deformation displacement of the subgrade is,and the lower the slope stability is.
作者
刘超群
刘栋
尚小亮
LIU Chaoqun;LIU Dong;SHANG Xiaoliang(Jiangxi Provincial Expressway Investment Group Co.,Ltd.,Nanchang 330025,China;Jiangxi Transportation Institute,Nanchang 330020,China;Jiangxi Provincial Highway Administration Bureau,Nanchang 330038,China)
出处
《路基工程》
2018年第2期91-95,111,共6页
Subgrade Engineering
基金
江西省交通运输厅科技项目:红粘土路基的工作机制及设计理论研究(2015C0023)
关键词
路基
边坡稳定性
有限元
强度折减
降雨
subgrade
slope stability
finite element
strength reduction
rainfall
