大气作用下非饱和土路基湿度及影响因素分析

摘要/Abstract

摘要： 基于水、蒸汽的流动方程及热能的扩散方程建立路基模型，分析了大气作用下路基湿度变化规律，通过改变相关的气相参数及土壤特性参数，研究了不同气候环境影响下的非饱和土路基湿度变化规律.结果表明：大气对非饱和土路基湿度的影响显著，但其影响的深度范围有限；太阳辐射量对路基湿度的影响最大，相对湿度次之；此外，路基填土的渗透系数及土水特性对路基的湿度影响较大，路基填土的初始含水量越高，则蒸发强度越大，路基的失水程度越高；在长时间小雨的降雨模式下，雨水更容易侵入路基，从而改变路基湿度.

关键词: , 热流方程, 湿热耦合, 太阳辐射量, 湿度, 降雨模式

Abstract: Based on the water, steam flow equation and heat diffusion equation, a subgrade model was established and the moistureity change rule of subgrade under the action of the atmosphere was studied. By changing the atmospheric phase parameters and the soil characteristics parameters, the unsaturated roadbed moistureity change rule under the influence of different climate environment was studied. The results show that the effect of atmosphere on the unsaturated soil subgrade is significant, and the depth of the impact range is limited, the subgrade moistureity change caused by solar radiation is the largest, the relative moistureity is the second largest; and the influence of the permeability coefficient and soil water characteristics of the subgrade itself on the filled soil moistureity change is very large; the higher the initial water content of the filled soil subgrade, and the bigger the evaporation strength, the higher the subgrade dehydrate degree; the rainwater will easier invade the subgrade, and the moistureity of the subgrade will be changed at long time and small rain rainfall pattern.

Key words: heat diffusion equation, hot and moisture coupling, solar radiation, moisture, rainfall pattern

中图分类号:

U416.1

刘杰, 姚海林, 胡梦玲, 卢正, 陈风光. 大气作用下非饱和土路基湿度及影响因素分析[J]. 上海交通大学学报（自然版）, 2011, 45(05): 772-776.

LIU Jie, YAO Hai-Lin, HU Meng-Ling, LU Zheng, CHEN Feng-Guang. Moisture Changes and Influencing Factors of Unsaturated Soil Subgrade under Atmospheric[J]. Journal of Shanghai Jiaotong University, 2011, 45(05): 772-776.

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