Determination of Hydraulic Properties of Unsaturated Soils Based on Nonequilibrium Multistep Outflow Experiments
文献类型：期刊论文
| 作者 | Chen, Pan2; Wei, Changfu1,2; Yi, Panpan3; Ma, Tiantian2 |
| 刊名 | JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
 |
| 出版日期 | 2017 |
| 卷号 | 143期号:1页码:- |
| 关键词 | Soil-water characteristic curve Hydraulic conductivity function Unsaturated soil Multistep outflow test Nonequilibrium flow Capillary relaxation |
| ISSN号 | 1090-0241 |
| DOI | 10.1061/(ASCE)GT.1943-5606.0001598 |
| 英文摘要 | In this paper, a new procedure for rapidly determining the hydraulic properties of unsaturated soils is developed. The proposed procedure is used to characterize the evolution of the instant degree of saturation in an unsaturated soil during a multistep outflow experiment. By introducing the concept of capillary relaxation, a theoretical model is developed and adopted to describe the dynamic hydraulic properties of unsaturated soils under constant-volume conditions. A series of nonequilibrium multistep outflow experiments are performed on various types of unsaturated soils. It is shown that the evolution of the instant degree of saturation or the outflow mass generally follows an exponential law. Both experimental results and theoretical simulations illustrate that flow instability and water blockage can occur in the soil during multistep outflow experiments. The theoretical predictions are compared to the experimental results, showing that the proposed procedure can be effectively used to determine the hydraulic properties of unsaturated soils. Because the outflow test is performed under nonequilibrium flow conditions, the experimental time for measuring the hydraulic properties is much shorter than those needed for conventional equilibrium procedures. (C) 2016 American Society of Civil Engineers. |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000393655900014 |
| 出版者 | ASCE-AMER SOC CIVIL ENGINEERS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/3985]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.Guilin Univ Technol, Guangxi Key Lab Bldg New Energy & Energy Conservi ; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 3.Wuchang Univ Technol, Dept Civil Engn |
| 推荐引用方式 GB/T 7714 | Chen, Pan,Wei, Changfu,Yi, Panpan,et al. Determination of Hydraulic Properties of Unsaturated Soils Based on Nonequilibrium Multistep Outflow Experiments[J]. JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING,2017,143(1):-. |
| APA | Chen, Pan,Wei, Changfu,Yi, Panpan,&Ma, Tiantian.(2017).Determination of Hydraulic Properties of Unsaturated Soils Based on Nonequilibrium Multistep Outflow Experiments.JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING,143(1),-. |
| MLA | Chen, Pan,et al."Determination of Hydraulic Properties of Unsaturated Soils Based on Nonequilibrium Multistep Outflow Experiments".JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING 143.1(2017):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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