摘要
在安哥拉某Quelo砂土场地开展了现场试坑浸水试验,实测了水在地基土中的渗透和消散过程;通过室内测试得到砂土的主要物理参数,采用改进的Kovács粒径方法估计土-水特征曲线,Van Genuchen模型估算渗透系数曲线,数值模拟了与现场试验情况相同的水渗透和消散过程;对比了实测结果和数值计算结果的异同。研究结果表明浸水条件下自由水面之下的砂土远未达到完全饱和,数值计算结果虽能较好反映浸水渗透的宏观规律以及停水后水的消散过程,但要较准确预测水的浸润范围,需要建立经验的"饱和体积含水率"取值方法,本砂土场地"饱和体积含水率"取对应饱和度65%的体积含水率较为适宜。
Unsaturated seepage is an important issue in the field of geotechnical engineering.It is of important engineering and theoretical significance to carry out the contrast work between the numerical solution and the field test.A test pit immersion test was carried out on a collapsible sand site in Angola to measure the infiltration and dissipation process of water in the foundation soil.The main physical parameters of the sand were obtained by indoor test.The soil-water characteristic curve was estimated by the improved Kovács particle size method,and the curve of coefficient of permeability was estimated by the Van Genuchen model.The same water infiltration and dissipation process was simulated numerically.The similarities and differences between the measured and numerical results were compared.The results show that the sand under the free water surface is far below saturation under the condition of soaking water.Although the numerical results can reflect the macro rule of water infiltration and the dissipation process of water after water stops well,it is necessary to establish the empirical method of“saturated volumetric water content”,if the range of water infiltration need accurately predicting.The“saturated volumetric water content”of the sand site is appropriate for the volumetric water content corresponding to 65%saturation.
作者
刘争宏
王华山
周远强
唐国艺
于永堂
刘智
LIU Zhenghong;WANG Huashan;ZHOU Yuanqiang;TANG Guoyi;YU Yongtang;LIU Zhi(School of Geology Engineering and Geomatics,Chang’an University,Xi’an,Shaanxi 710054,China;China JK Institute of Engineering Investigation and Design Co.Ltd.,Xi’an,Shaanxi 710043,China;Shaanxi Key Laboratory of Special Rocks&Soils,Xi’an,Shaanxi 710043,China;China Machinery Engineering Corporation,Beijing 100037,China)
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2018年第4期79-85,93,共8页
Hydrogeology & Engineering Geology
基金
科技部科技伙伴计划资助项目资助(KY201502002)
陕西省科技统筹创新工程计划项目资助(2016KTZDSF04-05-01)
CMEC 2016年科技研发基金项目资助(CMEC-KJYF-2016-06)
