基于现场渗透试验的黄土滑坡体入渗特性

发布时间：2018-05-07 17:59

  本文选题：黄土滑坡 + 入渗特性　； 参考：《兰州大学学报(自然科学版)》2017年03期

【摘要】：以天水市廖集村滑坡为例,分别在滑坡体后缘、中部和前缘部位进行原位双环渗水试验,获取渗透系数和稳定渗透深度定量指标来表征滑坡体不同部位的渗透能力,研究滑坡中水的主要入渗途径.结果表明:试验区域的渗透系数为1.00×10~(-3)~1.00×10~(-4)cm/s,为中等透水,入渗深度在2 m以内,滑坡体不同部位渗透性能存在较大差异,滑坡体后缘渗透系数是前缘的约12倍,原因是滑坡体后缘土层具有粗颗粒含量高且不均衡的级配特点和土层疏松的密实度特性.由高密度电法结果配合野外勘察发现,滑坡体中的水来自降雨直接入渗的贡献很小,裂隙分布位置与地下水分的赋存状态有极大相关性.雨水由裂隙快速进入坡体才是降雨入渗的主导方式.
[Abstract]:Taking Liogicun landslide in Tianshui City as an example, in situ double-ring seepage tests were carried out at the posterior, middle and leading edge of the landslide, respectively, to obtain the quantitative indexes of permeability coefficient and stable penetration depth to characterize the permeability of different parts of the landslide body. The main infiltration ways of water in landslide are studied. The results show that the permeability coefficient of the test area is 1.00 脳 10 ~ (10) ~ (-3) ~ (-1) 脳 10 ~ (10) ~ (-4) cm 路s ~ (-1), which is medium permeable, and the infiltration depth is less than 2 m. The permeability of different parts of the landslide is different, and the permeability coefficient of the posterior edge of the landslide is about 12 times of that of the front. The reason is that the soil layer behind the landslide body has the characteristics of high coarse particle content and uneven gradation and loose compactness of soil layer. According to the results of high density electrical method and field investigation, it is found that the contribution of water in landslide body from rainfall infiltration is very small, and the distribution of cracks is closely related to the occurrence of underground water. Rain Water entered the slope body quickly from crack is the dominant way of rainfall infiltration.
【作者单位】： 兰州大学资源环境学院甘肃省环境地质与灾害防治工程研究中心;
【基金】：国家国际科技合作专项项目(2013DFE23030) 国家科技支撑计划项目(2011BAK12B06) 中央高校基本科研业务费专项资金项目(lzujbky-2015-133,lzujbky-2015-bt01)
【分类号】：P642.22
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本文编号：1857909