不同温度下膨胀土裂隙演化规律研究  

Study on Crack Evolution Law of Expansive Soil under Different Temperatures

作　　者：申科[1] 朱潇钰 张英莹[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《水电能源科学》2017年第3期116-118,共3页Water Resources and Power

摘　　要：为研究温度因素对膨胀土裂隙发展的影响,以宜昌某地膨胀土为例,利用称重拍照系统和Matlab编写图像处理程序,进行了100、75、50℃三种环境下的湿干循环试验。结果表明,除试样的水分蒸发量之外,蒸发速度和含水率梯度也是影响裂隙发展的关键因素;试样表层蒸发速度比里层蒸发速度快,温度越高,裂隙发展的就越快,试样被裂隙切割的越破碎;在不同的温度环境下,裂隙率的差异会随着循环次数的增加而增加。研究结果为膨胀土边坡稳定性研究提供了依据。To study the effect of temperature on fissure development of expansive soil,cyclic wetting-drying tests of a typical expansive soil in Yichang were conducted at conditions of 100,75 and 50 ℃.The evaporation and absorption processes were recorded by digital camera and the variation of water content was automatically weighted by high-precision balance.The images of fissure were processed and analyzed by Matlab program.The results show that the evaporation rate,water content,and evaporation velocity are the key factors for fissure development.The evaporation velocity at sample surface is greater than that of interior.The higher of the environmental temperature,the faster of fissure growth and the more fragile of the mass is.The ratio of fissures increases with cyclic times.The result is benefit for slope stability analysis of expansive soil.

关 键 词：温度 膨胀土裂隙 图像处理 蒸发速度 含水率梯度 

分 类 号：TU443[建筑科学—岩土工程]