摘要
为研究不同降雨强度下一维土柱的水分入渗规律,以深圳市某地铁基坑项目土体为试验对象,借助室内降雨模拟系统,展开了一维土柱模型降雨入渗试验,得到了不同降雨条件下的土体含水率时程曲线、湿润锋发展曲线和土体含水率增速曲线,发现当降雨强度q>50mm/d时,下部土体的降雨入渗时程曲线会在三段类的基础上发展为四段类;降雨强度为小雨时湿润锋发展最慢,降雨强度为大暴雨时湿润锋发展最快;降雨强度过大并产生积水的情况下会显著提高土体含水率增速,积水越早,土体的含水率增速越大.结果表明在降雨入渗过程中,上下土层的含水率时程曲线是不同的;弱透水层的存在会加快土体的湿润锋发展速度和含水率增速.为降雨入渗作用下的基坑稳定性研究提供参考.
This paper studies the water infiltration law of one-dimensional soil column under dfferent rainfall intensities.Taking the soil of a subway foundation pit project in Shenzhen as the case,the one-dimensional soil column model rainfall infiltration experiment was carried out with the help of the indoor rainfall simulation system.The soil moisture content time-history curve,the wetting front development curve,and the soil moisture content growth curve under different rainfall conditions are obtained.The results show that when the rainfall intensity q>5Omm/d,the rainfall infiltration time history curve of the lower soil mass develops into four segments on the basis of three segments.The development of wet front is the slowest when rainfall intensity is light rain,and the fastest when rainfall intensity is heavy rain.If the rainfall intensity is too large and ponding is generated,the growth rate of soil moisture content will be significantly increased.The earlier the ponding is,the greater the growth rate of soil moisture content will be.The water content time history curves of upper and lower soil layers are different during rainfall infiltration.The existence of aquitard accelerates the development speed of wetting front and water content of soil mass.The paper may provide the reference for the study of foundation pit stability under rainfall infiltration.
作者
董连成
王志
金圣豪
DONG Liancheng;WANG Zhi;JIN Shenghao(School of Architecture&Civil Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)
出处
《低温建筑技术》
2023年第3期105-108,113,共5页
Low Temperature Architecture Technology
关键词
降雨入渗规律
一维土柱
湿润锋发展曲线
rainfall infiltration law
one-dimensional soil column
development curve of wetting front
