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| 非饱和土的蒸发效应与影响因素分析 | |
| 引用本文： | 陈建斌,孔令伟,赵艳林,吕海波.非饱和土的蒸发效应与影响因素分析[J].岩土力学,2007,28(1):36-40. |
| 作者姓名： | 陈建斌 孔令伟 赵艳林 吕海波 |
| 作者单位： | 1. 中国科学院,岩土力学重点实验室,武汉,430071 2. 广西大学,土木建筑工程学院防灾减灾研究所,南宁,530004;桂林工学院,土木工程系,桂林,541004 3. 广西大学,土木建筑工程学院防灾减灾研究所,南宁,530004 |
| 基金项目： | 国家重点基础研究发展计划(973计划);中国科学院前沿领域研究基金 |
| 摘 要： | 采用非饱和土等温流和考虑热湿耦合的非等温流方程，结合不同的蒸发计算模型，分析了大气蒸发效应对非饱和土吸力变化的影响，并对控制蒸发量计算的多个参数进行了影响程度分析。结果表明，考虑实际蒸发量和非饱和土热湿耦合的水分运动公式能较好地模拟大气影响下非饱和土吸力变化状态，通常所采用的等温流方程加以潜在蒸发量计算非饱和土吸力变化会高估表层蒸发和吸力的下降程度。控制地面蒸发的主导因素是外部气象条件，尤其以太阳净辐射量和风速为最，土体自身特性参数影响程度有限。 |
| 关 键 词： | 非饱和土 热湿耦合 蒸发效应 参数影响 吸力 |
| 文章编号： | 1000-7598-（2007）01-0036-05 |
| 收稿时间： | 2005-11-10 |
| 修稿时间： | 2005-11-10 |
Evaporation effect in unsaturated soil and its influential factors |
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| CHEN Jian-bin,KONG Ling-wei,ZHAO Yan-lin,LU Hai-bo.Evaporation effect in unsaturated soil and its influential factors[J].Rock and Soil Mechanics,2007,28(1):36-40. | |
| Authors: | CHEN Jian-bin KONG Ling-wei ZHAO Yan-lin LU Hai-bo |
| Institution: | 1.Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Research Institute of Preventing and Mitigating Disasters, College of Civil Engineering, Guangxi University, Nanning 530004, China; 3.Department of Civil Engineering, Guilin University of Technology, Guilin 541004, China |
| Abstract: | Evaporation effect on the suction in the unsaturated soils is analyzed by solving the equations of isothermal flow and coupled heat-moisture anisothermal flow with various calculated models of evaporation. The influences of various climatic parameters and soil properties on the calculation of evaporation are also discussed. It is shown that the behavior of suction in the unsaturated soil can be perfectly modeled by the equation of coupled heat-moisture anisothermal flow with the formulation of considering actual evaporation and commonly-used methods by solving isothermal flow with the boundary of potential evaporation evidently overestimate the evaporation magnitude in the soil surface and the decreasing magnitude of suction. The major governing factor for the evaporation of soil surface is outer climatic condition where solar net radiation and wind velocity are the most contribution, while the internal parameters of soil property play a less role in the estimation of evaporation. |
| Keywords: | unsaturated soil coupling of heat and moisture evaporation effect parameter effect suction |
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