| 蒸发条件下路基对气候变化的响应模型及影响因素分析 |
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| 引用本文： | 杨洋,姚海林,卢正.蒸发条件下路基对气候变化的响应模型及影响因素分析[J].岩土力学,2009,30(5):1209-1214. |
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| 作者姓名： | 杨洋 姚海林 卢正 |
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| 作者单位： | 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
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| 基金项目： | 交通部西部交通建设科技项目 |
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| 摘 要： | 以受大气影响下的公路路基为研究对象，建立了蒸发条件下路基对气候变化的响应模型，该模型考虑了温度-水-应力的耦合作用，采用非饱和土实际蒸发量作为边界条件。采用该模型对大气蒸发条件下南宁某公路路基的蒸发过程进行了模拟分析，结果表明，用实际蒸发量作为边界条件的热-水-应力模型可以较好地模拟大气在蒸发条件下路基的响应过程。在蒸发过程中，水蒸气的扩散对路基的蒸发量和含水率的影响较大。通过用正弦波描述昼夜蒸发强度的变化，研究了天气的周期变化对蒸发过程的影响，可以看出，天气周期变化对表层影响很大，但影响的深度有限。天气周期变化影响下的表层含水率并不是单调减小，而是随着蒸发强度的变化有一个干湿过程。
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| 关 键 词： | 数值模拟 大气蒸发 热-水-应力耦合 水蒸气扩散 |
| 收稿时间： | 2008-05-23 |
Model of subgrade soil responding to change of atmosphere under evaporation and its influential factors |
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| YANG Yang,YAO Hai-lin,LU Zheng.Model of subgrade soil responding to change of atmosphere under evaporation and its influential factors[J].Rock and Soil Mechanics,2009,30(5):1209-1214. |
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| Authors: | YANG Yang YAO Hai-lin LU Zheng |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Based on the equations of coupled thermo-fluid-mechanics, a model of subgrade soil responding to the change of atmosphere is established with the boundaries of actual evaporation. The influence of climatic evaporation on a certain subgrade soil is analyzed by the model. It is shown that the behavior of subgrade soil can be perfectly modeled by the equation of coupled thermo-hydro-mechanics with the formulation considering actual evaporation. The water vapor diffusion is very important to evaporation and volumetric water content under the condition of evaporation. By studying the influence of the periodic change of weather on the subgrade soil by simulating the difference of evaporation with sine wave, it has an important influence on surface layer. There is a desorption-absorption cycle of moisture of surface layer with the periodic change of evaporation. |
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| Keywords: | numerical simulation evaporation thermo-hydro-mechanical coupling water vapor diffusion |
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