摘要
在西藏地区,以溜砂坡为代表的地质灾害分布较为广泛。溜砂坡灾害常伴随着降雨而形成。雨水的渗入会导致坡体内负孔隙水压力先增大后减小,细颗粒流失,从而使其抗剪强度降低,并在动水压力作用下发生浅层滑坡。文章针对溜砂坡在降雨条件下的特点,设计了模拟降雨条件的室内试验装置;基于渗透模型和试验现象分析溜砂坡在降雨过程中稳定性的变化,从而评估坡表水和地下水对不同粒组组合下的溜砂坡稳定性影响。得出结论如下:(1)降雨过程中,在坡表水和地下水综合作用下,溜砂坡的排水能力不断增强;(2)粒组的缺失会严重影响溜砂坡在降雨条件下的固砂能力和抗雨水冲刷能力。
In Tibet,geological disasters represented by sand-slide slope are widely distributed.Sliding sand slope disasters often occur along with rainfall.Rainwater infiltration leads to negative pore water pressure increase after decrease,and loss of fine particles,so that the shear strength is reduced,and shallow landslide occur under the dynamic water pressure.According to the characteristics of sand-slide slope under rainfall conditions,an indoor test device is designed to simulate rainfall conditions.Based on the infiltration model and the test phenomenon,the change of slope stability during rainfall is analyzed,so as to evaluate the influence of surface water and groundwater on slope stability under different grain combinations.The conclusions are as follows:①In the process of rainfall,under the combined action of surface water of slope and groundwater,the drainage capacity of sand slide slope is continuously enhanced.And②the deficiency of potassium chloride group will seriously affect the ability of sand fixation and antirain scour of the sandal slope under rainfall conditions.
作者
夏柯
田荣燕
吕建波
贾璐
罗进
XIA Ke;TIAN Rong-yan;LYU Jian-bo;JIA Lu;LUO Jin(School of Engineering,Tibet University,Lhasa 850000,China)
出处
《公路》
北大核心
2019年第6期20-26,共7页
Highway
基金
西藏自治区重点科技计划项目,项目编号Z2014A19G2-11
国家级大学生创新训练项目,项目编号201810694017
关键词
溜砂坡
降雨条件
渗透模型
粒组
sand-sliding slope
rainfall conditions
infiltration model
grain group
