摘要
为了研究膨胀土土体表面裂隙率的发展规律及表面裂隙与渗流的关系,以湖北省宜昌市某地膨胀土为例,利用称重、拍照以及Matlab编写图像处理程序等技术,开展了循环降雨入渗蒸发试验.结果表明,土体表面在干湿循环反复作用下,裂隙率逐渐增大,最终达到一个稳定值;雨水入渗的速度随着裂隙率的增加而加快;随着干湿循环次数的增加,土体变得疏松且饱和含水率逐渐增加.研究结果为降雨入渗引起的膨胀土边坡失稳的研究以及对滑坡灾害的预测预防提供了理论依据.
In order to study the development law of the surface fissure rate of the expansive soil and the relationship between surface fissures and seepage,an expansive soil in Yichang is taken for example.The rainfall infiltration and evaporation processes are recorded by digital camera;and the variation of moisture content is weighted by high-precision balance.The images of fissure are processed and analyzed by Matlab program.The results show that at the surface area of the soil under the cyclic wetting-drying tests,the cracking rate gradually increases,and finally reaches a stable value;the rainfall infiltration rate increases as the cracking rate increases;The more the number of the cyclic wetting-drying tests,the more loose the soil is,the greater the saturated moisture content is.The research results provide a theoretical basis for the research on the slope instability of expansive soil caused by rainfall infiltration and the prediction and prevention of landslide hazards.
作者
张英莹
张华
朱潇钰
黄亮
张言
Zhang Yingying;Zhang Hua;Zhu Xiaoyu;Huang Liang;Zhang Yan(Key Laboratory of Geological Hazards of Three Gorges Reservoir Area of Ministry of Education,China Three Gorges Univ.,Yichang 443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2019年第2期59-62,共4页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金"简单屋顶绿化水分运移试验与数值模拟研究"(51178251)
关键词
膨胀土
表面裂隙
降雨入渗蒸发
渗透性
含水率
expansive soil
surface cracks
rainfall infiltration and evaporation
permeability
moisture content
作者简介
通信作者:张华(1974-),男,教授,博士生导师,研究方向为非饱和土力学.E-mail:cezhua@139.com
