摘要
通过室内试验研究了内蒙古压实红黏土在不同干燥温度条件下干缩裂隙的发展规律,探讨了红黏土产生裂隙时含水率的变化情况,采用图像处理技术定量分析了压实红黏土在干燥过程中裂隙的几何特征(平均裂缝宽度、裂缝总长度、裂隙率)与分形特征(分形维数).结果表明:不同干燥温度下,试样含水率随干燥时间的变化趋势相似,试样在初始干燥阶段失水较快,呈线性变化趋势,随着干燥时间的延续,水分蒸发速率逐渐减缓,最终达到稳定;温度对试样收缩裂隙的发展影响显著,温度越高试样裂隙发育达到稳定状态所需时间越短,且裂隙几何特征值与分形维数越大,温度低则相反;裂隙分形维数与裂隙长度、裂隙平均宽度以及裂隙率呈指数函数关系.
Through the laboratory test,the development law of dry shrinkage cracks of compacted red clay in Inner Mongolia was investigated under different drying temperatures.The variation of water content during the cracking of red clay was discussed.By image processing technology,the compacted red clay was quantitatively analyzed based on the fracture network geometry characteristics of average fracture width,total fracture length,fracture rate and fractal dimension.The results show that the water content of the sample has similar trend with the change of drying time at different drying temperatures.In the initial drying stage,the sample loses water quickly and shows linear trend.With the continuation of drying time,the evaporation rate of water gradually slows down and eventually stabilizes.Temperature has significant effect on the development of shrinkage cracks.With the increasing of temperature,the required time is decreased for the fracture development to reach stable state,and the values of fractal dimension and geometric eigenvalue are increased.However,the situation is on the contrary for low temperature.The fractal dimension is exponentially related to fracture length,average fracture width and fracture rate.
作者
张宏
何灵灵
ZHANG Hong;HE Lingling(Transportation Institute, Inner Mongolia University, Hohhot, Inner Mongolia 010070, China;Research Institute of Integrated Transportation Science of Inner Mongolia, Hohhot, Inner Mongolia 010051, China)
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2020年第4期387-391,共5页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51468047)
内蒙古自然科学基金面上项目(2015MS523,2016MS0531)。
关键词
压实红黏土
裂隙几何特征
图像处理
分形维数
干燥温度
compacted red clay
fracture geometry
image processing
fractal dimension
drying temperature
