基于现场渗透试验的黄土滑坡体入渗特性 - 兰州大学.pdf

兰州大学学报: 自然科学版, 2017, 53(3) / 6 月 Journal of Lanzhou University ：Natural Sciences，2017 ，53(3) / June 基于现场渗透试验的黄土滑坡体入渗特性 杨仲康, 陈 冠, 孟兴民, 陈 玺, 张 毅, 王思源 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, 兰州 730000 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 -3 -4 途径. 结果表明: 试验区域的渗透系数为1.00×10 ~ 1.00×10 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. 关键词：黄土滑坡; 入渗特性; 双环渗水试验; 黄土裂隙; 天水市 中图分类号：P642.22 文献标识码：A 文章编号: 0455-2059(2017)03-0285-07 DOI: 10.13885/j.issn.0455-2059.2017.03.001 Infiltration characteristics of loess landslide based on a infiltration test in the field Yang Zhong-kang, Chen Guan, Meng Xing-min, Chen Xi, Zhang Yi, Wang Si-yuan Gansu Environmental Geology and Geohazards Engineering Research Centre, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China Abstract: Permeability tests were conducted at the trailing edge, center position and leading edge of a landslide respectively in Liaoji Village, Tianshui City, and the indexes of permeability coefficient and stable penetration depth were used to characterize the permeability of different positions of the landslide, with the ultimate goal of exploring the main infiltration ways of water in the landslide. The results -3 -4 showed that the permeability coefficient was about 1.00 × 10 -1.00 × 10 cm/s and the infiltration depth was less th