基于现场渗透试验的黄土滑坡体入渗特性  

Infiltration characteristics of loess landslide based on a infiltration test in the field

作　　者：杨仲康[1] 陈冠[1] 孟兴民[1] 陈玺[1] 张毅[1] 王思源[1] 

机构地区：[1]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

出　　处：《兰州大学学报（自然科学版）》2017年第3期285-291,共7页Journal of Lanzhou University(Natural Sciences)

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)

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.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 showed that the permeability coefficient was about 1.00× 10-3- 1.00× 10-4cm/s and the infiltration depth was less than 2 m. There were marked infiltration differences between different parts of the landslide, and the infiltration of trailing edge was approximately 12 times that of the leading edge. According to a grain size analysis test and standard penetration test, the reason for the difference was that the soil in the trailing edge was of a higher coarse grain content, unbalanced grain size and more loose structure. Base on an electrical method and surveying, the water in the slope from the direct infiltration was of a very small amount and had an important relationship with the distribution of the cracks. The ways from the cracks were the dominant manner for the slope to obtain water.

关 键 词：黄土滑坡 入渗特性 双环渗水试验 黄土裂隙 天水市 

分 类 号：P642.22[天文地球—工程地质学]