欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
开展了湿干循环作用下压实黏土的开裂试验和微观结构特性研究，分析了湿干循环作用对黏土开裂和孔隙结构的影响，将压汞试验（MIP）和扫描电镜（SEM）的结果与宏观开裂进行比较。结果表明：湿干循环作用显著影响了压实黏土的开裂，用开裂因子表征黏土的开裂程度，开裂因子随含水率减小而增大并明显大于湿干循环作用前；随湿干循环次数的增加，黏土孔隙的总体积、中间孔径、平均孔径、平均孔隙率和团粒内孔隙均在增加，而黏土的颗粒内孔隙、颗粒间孔隙和团粒间孔隙却在减小。湿干循环作用使黏土体从大团粒逐渐转化为小颗粒，并增大了土颗粒的凸凹性，分析SEM二值化图像得知土体孔隙率均在增加；用压汞法和扫描电镜法分析和解释土体开裂是可行的，所得的微观孔隙特征与宏观开裂规律基本相符。
英文摘要：
This paper adopts cracking experiments and micro experiment observations of compacted clay specimens under the influence of different wetting-drying cycles.It investigates the effects of wetting-drying cycles on clay cracking and pore structure.Moreover it compares the experimental results of Mercury Intrusion Porosimetry（MIP） and Scanning Electron Microscopy （SEM）tests with those of the macro cracking experiments.The experimental results show that the wetting-drying cycles have a great influence on compacted clay cracking.The Cracking Intensity Factor （CIF ）,representing the degree of compacted clay cracking, increases as moisture contents decrease,and is obviously larger than that before the wetting-drying cycles.As the number of wetting-drying cycles increases,the total volume of the pores,as the median pore diameter,the mean pore diameter,the mean porosity and the intra-aggregate pores increase.But the intra-particle pores,the inter-particle pores and the inter-aggregate pores reduce obviously.The wetting-drying cycles make the large aggregates of the clay gradually transform into small particles and increase the convexity of the soil particles.Besides,it is observed from the analysis of SEM＆nbsp;binary image that the porosity increases with the wetting-drying cycles growing.It is plausible to employ Mercury Intrusion Porosimetry （MIP ） and Scanning Electron Microscopy （SEM）tests to analyze and explain the clay cracking.The micro pore characteristics derived from the tests are in line with the macro clay cracking law.
同期刊论文项目
同项目期刊论文
期刊信息
位置：