环境因素对膨胀土边坡温度场影响的模型试验  

Model test of the influence of environmental factors on temperature field in expansive soil slope

作　　者：周东[1,2] 孙义刚[1,2] 乐观永[1,2] 王业田[1,2] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2011年第4期653-658,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(40772190);广西自然科学基金资助项目(桂科自0832026);广西区教育厅科研基金资助项目(T081007)

摘　　要：为研究环境因素对土体温度场的影响,通过制作膨胀土边坡模型,利用环境发生器模拟温度、湿度和降雨等环境,观测在这些环境因素作用下土体内部温度场的分布与变化规律,试验结果表明:温度、相对湿度和降雨等环境因素对边坡土体内温度场的影响深度为0.8 m;边坡不同部位的温度变化与分布也不同,其中坡面处的变化幅度最大;土体温度随环境温度的变化存在明显的滞后性,且深度越大,滞后效应越明显。在环境温度的变化情况和环境相对湿度相同的条件下,降雨后土体温度变化速率减小。在相同的环境温度下,深度0.2 m范围内的土体温度随环境相对湿度的降低而降低,且降雨前的下降幅度总体上大于降雨后的下降幅度。In order to investigate the influence of environmental factors on temperature field in expansive soil slope,the distribution and variation of temperature field in the soil under the factors such as temperature,humidity and rainfall,were measured by making a model of expansive soil slope and using an environmental generator to stimulate the environmental factors.The test shows that the influence depth of the environmental factors on temperature field in the slope soil is 0.8 m;the variation and distribution of temperature is different in different parts of the slope,and the largest change occurs at the slope surface;obvious hysteretic effect appears as soil temperature changes with the environmental temperature.The deeper the depth,the more obvious the hysteresis effect is found.When the variation of the environmental temperature is the same as that of the environmental relative humidity,the change rate of soil temperature decreases after rain.When the environmental temperature is the same,soil temperature within the depth of 0.2 m decreases as the environmental relative humidity decreases,and the decreased magnitude before rain is generally larger than that after rain.

关 键 词：膨胀土边坡 环境因素 温度场 模型试验 

分 类 号：TU411.93[建筑科学—岩土工程]