| 水-力耦合作用下干燥和湿润砂质黄土渗透特性试验研究 |
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| 引用本文： | 蔡国庆,刘倩倩,杨雨,李舰,赵成刚.水-力耦合作用下干燥和湿润砂质黄土渗透特性试验研究[J].土木工程学报,2022,55(3):74-82. |
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| 作者姓名： | 蔡国庆 刘倩倩 杨雨 李舰 赵成刚 |
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| 作者单位： | 1. 北京交通大学城市地下工程教育部重点实验室，北京 100044； 2. 北京交通大学土木建筑工程学院，北京 100044；
3. 中国建筑第五工程局有限公司，湖南长沙 410000 |
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| 基金项目： | 中央高校基本科研业务费项目(2021JBM111)；;国家自然科学基金(U2034204,52078031)；;北京市自然科学基金(8202038)； |
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| 摘 要： | 为探讨干燥和湿润砂质黄土在水-力耦合作用下的非饱和渗透特性,研制考虑水-力耦合效应的非饱和土渗透系数测量试验装置.针对不同初始含水率的干燥土柱和湿润土柱,采用湿润锋前进法开展一系列一维土柱渗流试验,得到水-力耦合作用下湿润锋、渗透系数与竖向变形的变化规律,并结合扫描电镜试验,揭示其微观机理.结果表明:①随入渗时间增大,...
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| 关 键 词： | 水-力耦合 砂质黄土 渗流试验 湿润锋前进法 渗透系数函数 |
Experimental study on seepage characteristics of dry and wet sandy loess under hydro-mechanical coupling |
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| Cai Guoqing Liu Qianqian Yang Yu Li Jian Zhao Chenggang.Experimental study on seepage characteristics of dry and wet sandy loess under hydro-mechanical coupling[J].China Civil Engineering Journal,2022,55(3):74-82. |
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| Authors: | Cai Guoqing Liu Qianqian Yang Yu Li Jian Zhao Chenggang |
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| Affiliation: | 1. Key Laboratory of Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
3. China Construction Fifth Engineering Division Co., Ltd., Changsha 410000, China |
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| Abstract: | A hydro-mechanical coupling apparatus is developed to explore the unsaturated hydraulic conductivity characteristics of dry and wet sandy loess under hydro-mechanical coupling action. Based on the test apparatus, a series of seepage tests on one-dimensional columns of sandy loess are carried out using the “the wetting front advancing method” for completely dry soil columns and wet soil columns. The variation laws of the wetting front, hydraulic conductivity, and axial deformation under the hydro-mechanical coupling are obtained, and the corresponding microscopic mechanism of sandy loess is studied with scanning electron microscope experiment. It is found that: (1) At the early stage of infiltration, the wetting front advancing velocity of the dry soil column and the wet soil column are approximately the same, while in the late period of infiltration, the wetting front advancing velocity of the dry soil column is significantly less than that of the wet soil column. (2) Given the same axial load, the slope of the linear segment of the hydraulic conductivity function curve of the wet soil column is greater than that of the dry soil column. With the axial load increases, the slopes of the linear segment of the hydraulic conductivity functions of the two types of soil columns decrease slightly. When the seepage flow is stable, the stable hydraulic conductivity of the wet soil column is greater than that of the dry soil column. (3) Compared with the wet soil column, the dry soil column has obvious water sensitivity, and after wetting its deformation increases significantly. The research results have important theoretical and practical significance for revealing the seepage and deformation mechanism of surrounding rock of the sandy loess of Yangcheng Tunnel and guiding the construction safety of the tunnel. |
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| Keywords: | hydro-mechanical coupling sandy loess seepage test wetting front advancing method hydraulic conductivity function |
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