摘要
在黄土高原平山丘和填沟壑等重大工程施工中形成了大范围的直立黄土填坡,在连续降雨条件下将形成重大的安全隐患。因此,对直立黄土填坡在降雨条件下的人渗特征进行了室内研究,得到如下结论:雨水入渗导致黄土填坡基质吸力先降低后稳定,离地面高度分别为0.30、0.65、0.95m处的基质吸力分别降低了59.2%、41.7%、76.3%;基质吸力降低至稳定阶段前期坡体并未发生局部破坏。可见入渗导致黄土填坡破坏具有滞后性。雨水入渗导致黄土填坡含水率和孔隙水压力均有不同程度的上升,直立黄土填坡局部垮塌过程中形成超孔隙水压力,导致孔隙水压力和位移出现骤变现象。
Under the condition of continuous rainfall,a large range of vertical loess filled slope caused by the loess plateau hill and gully filled project will form major safety hazard.In view of the above problems,the infiltration characteristics of vertical loess filled slope under rainfall conditions are studied indoor in this paper.The following conclusions are drawn:as a result of rainwater infiltration,the matric suction of loess filled slope was reduced at first and then stabilized.The matric suction at 0.30 m,0.65 m and 0.95 m above the ground are reduced by 59.2%,41.7%and 76.3%respectively.When the matric suction was reduced to the early stage of the stabilization,the slope body aren't partially destroyed.The failure of loess filled slope caused by the infiltration is delayed.The water content and pore water pressure in loess fill slope rise in different degrees.In the process of local collapse of filled slope,excess pore water pressure is formed and cause sudden change of pore water pressure and displacement.
作者
王彬
Wang Bin(The Fifth Engineering Co.,Ltd.of China Railway 18th Bureau Group,Shanghai 200444,China)
出处
《市政技术》
2021年第5期33-36,共4页
Journal of Municipal Technology
关键词
黄土填坡
力学特征
基质吸力
含水率
孔隙水压力
loess filled slope
mechanical characteristics
matrix suction
moisture content
pore water pressure
