| 降雨入渗下非饱和坡残积土湿润锋运移试验研究 |
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| 引用本文： | 简文彬,黄聪惠,罗阳华,聂闻.降雨入渗下非饱和坡残积土湿润锋运移试验研究[J].岩土力学,2020,41(4):1123-1133. |
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| 作者姓名： | 简文彬 黄聪惠 罗阳华 聂闻 |
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| 作者单位： | 1. 福州大学 岩土与地质工程系，福建 福州 350108；2. 福州大学 地质工程福建省高校工程研究中心，福建 福州 350108；
3. 中国科学院海西研究院泉州装备制造研究所，福建 泉州 362200 |
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| 基金项目： | 国家自然科学基金（No. 41861134011） |
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| 摘 要： | 我国东南沿海地区丘陵山地发育,降雨入渗到土体中的水分是导致滑坡灾害频发的关键因素。以福建省泉州市德化县地质灾害点为主要研究对象,考察典型地质灾害点具有代表性的坡积土与花岗岩残积土的渗透特性。利用自行研制的土体入渗装置,分别在降雨强度为15、30、60mm/h条件下,考虑降雨历时一致(180min)与过程降雨量一致(90mm)两种工况开展一维土柱入渗试验,得到相应的各个土柱含水率、湿润锋、入渗率随时间变化的响应规律。试验结果表明:(1)土体渗透系数越大、雨强越大,土体湿润蔓延距离越深、速度越快。(2)降雨入渗过程中,土体含水率由浅及深逐次对降雨进行响应。不同雨强对含水率的影响主要体现在第一次响应时间以及饱和速度上,雨强越大,响应时间越快,饱和速度也越快。(3)提出可表征在不同雨强作用下,德化县马坪滑坡与崩土岭滑坡的湿润锋入渗公式。该研究成果对台风暴雨型滑坡的孕灾机制分析以及精细化监测预警具有重要的理论及实际意义。
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| 关 键 词： | 降雨 坡残积土 湿润锋 响应时间 滑坡 |
| 收稿时间： | 2019-03-11 |
| 修稿时间： | 2019-06-20 |
Experimental study on wetting front migration induced by rainfall infiltration in unsaturated eluvial and residual soil |
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| JIAN Wen-bin,HUANG Cong-hui,LUO Yang-hua,NIE Wen.Experimental study on wetting front migration induced by rainfall infiltration in unsaturated eluvial and residual soil[J].Rock and Soil Mechanics,2020,41(4):1123-1133. |
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| Authors: | JIAN Wen-bin HUANG Cong-hui LUO Yang-hua NIE Wen |
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| Institution: | 1. Department of Geotechnical and Geological Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;
2. Engineering Research Center of Geological Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;
3. Quanzhou Institute of Equipment Manufacturing, Haixi Institute, Chinese Academy of Sciences, Quanzhou, Fujian 362200, China |
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| Abstract: | Rain infiltration through the soil is the critical factor in the frequent landslides on the coast of China. By considering the geological disaster points of Dehua County, Quanzhou City, Fujian Province as the main research object, the permeability characteristics of slope soil and granite residual soil are concerned in these typical geological disaster points. The one-dimensional soil column infiltration test was carried out using the soil infiltration device developed by simulating rain intensities of 15, 30 and 60 mm/h, respectively, with the rainfall conditions of duration (180 min) and amount (90 mm). The response law of moisture content, wetting front and infiltration rate of each soil column with time under different working conditions was investigated. The main results are presented in detail. The soil wetness spreads deeper and faster as the permeability coefficient of soil and the rainfall intensity become greater. The soil moisture content responds to rainfall from shallow to deep part during the process of rainfall infiltration. Meanwhile, the influence of different rain intensities on water content is mainly reflected in the first response time and saturation time. The high intensity of rain leads to short response time and a quick saturation speed. A function is proposed for different rainfall intensities, which can characterise the wetting front infiltration laws of the Maping landslide and the Bengtuling landslide in Dehua County. The results are of great significance for the early warning of landslide hazards. |
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| Keywords: | rainfall slopewash and residual soil wetting front response time landslide |
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