浅层红黏土的细观结构演化规律研究

湿干循环作用会对土样的细观结构产生影响。为了研究浅层红黏土的细观结构在湿干循环过程中的演化规律，研制了可以进行 CT 扫描的 CT －固结仪。在不同压力作用下对桂林雁山原状红黏土及其重塑土进行了多组湿干循环试验，并对每次烘干和增湿稳定后的土样进行 CT 扫描，跟踪观察湿干循环过程中土样的细观结构变化。研究结果表明：增湿和干燥都能使原状红黏土及其重塑土的结构造成损伤。定义了基于 CT 数据的红黏土的细观结构参数，提出了定量描述红黏土细观结构演化与土样饱和度、湿干循环次数、上部荷载之间的数学表达式，预测结果与试验资料比较接近。

Microstructure Evolution of Red Clay During Wet-dry Cycles

Wet-dry cycles affect the micro structure of soil samples .In order to study its evolution of red clay during wet-dry cycles ,the CT-consolidation apparatus was developed .A number of tests of wet-dry cycles were carried out for intact and remolded red clay under loading condition ,and CT scanning was taken on samples after each wetting and drying fin -ished .The results indicate that both wetting and drying can induce the structural damage of undisturbed and remolded red clay .Micro structure evolution parameters were defined ,and the relationship between micro-structure evolution parame-ters and saturation ,times of wetting-drying cycles ,upper load was proposed ,the predicted results agreed well with the experimental data .