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| 非饱和红壤土降雨入渗室内模拟试验 |
| An Indoor Experimantal Study on Rainfall Infiltration of Unsaturated Red-clay |
| 投稿时间：2015-06-17 修订日期：2015-09-22 |
| DOI：10.14050/j.cnki.1672-9250.2016.03.014 |
| 中文关键词: 非饱和土;红壤土;降雨入渗;含水率;宏观渗透系数 |
| 英文关键词: unsaturated soil;red-clay;rainfall infiltration;moisture content;macroscopic permeability coefficient |
| 基金项目:国家自然科学基金项目(41462011);江西省自然科学基金项目(20122BAB216002);江西省数字国土重点实验室开放基金项目项目(DLLG201112) |
| 作者 | 单位 | E-mail | | 薛凯喜1,2, 赵宝云3, 胡艳香1,2, 魏永起1,2, 程丽红1,2 | 1. 东华理工大学 核资源与环境国家重点实验室培育基地, 南昌 330013
2. 江西省数字国土重点实验室, 南昌 330013
3. 重庆科技学院, 重庆 400045 | baoyun666@cqust.edu.cn |
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| 中文摘要: |
| 以江西省域范围内典型红壤土为研究对象,利用自行研制开发的降雨模拟试验设备与渗透试验装置,设计了大雨工况下土体初始含水率、干密度、降雨累积时间及降雨后土体静置时间等对其渗透性影响的室内试验。试验结果显示,土体渗透性随初始含水率的升高逐渐降低,给出的宏观渗透系数公式定量化描述了不同初始含水率的可渗透性强弱程度;在初始含水率相对固定的情况下,土体渗透性随干密度的增大逐渐减小,且干密度增大到一定程度后其渗透性锐减,各水平之间的差异性不再明显;累积降雨时间会显著影响深部土体的渗透性,降雨历时越长,深部土体的含水率越高;雨水的在降雨过程停止后继续沿土体纵深入渗,致使表层含水率降低,深部含水率提高,含水率特征曲线趋向竖直。 |
| 英文摘要: |
| With typical red-clay in Jiangxi Province, China as the research object, by using rainfall simulation experimental equipment and penetration test device made by ECIT, this paper studied permeability of red-clay under heavy rainfall. Experimental results show that the permeability of red-clay decreases gradually with increasing initial moisture content. A macroscopic permeability coefficient formula is given to describe the power degrees of permeability with different initial moisture contents. Under the same condition of the moisture content, red-clay permeability increases with decreasing dry density, and permeability will present a sharp decline state when dry density increase to a certain degree, then moisture content of the same point between different dry density levels will no longer obvious. Cumulative rainfall time affects permeability of the red-clay significantly; the longer the rainfall duration is, the higher the deep soil moisture content will be. The infiltration progress will be continue when the rainfall stops, in this progress the surface moisture content decreases, and the moisture in the deep point of soil increases. The moisture content characteristic curve is tending to a vertical line. |
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