中国南方碳酸盐岩上覆红黏土龟裂研究进展  

Review on the Desiccation Cracks of Red Clay Overlying Carbonate Rocks in South China

作　　者：龙郧铠 张家明[1] 陈茂 LONG Yunkai;ZHANG Jiaming;CHEN Mao(Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《武汉理工大学学报（交通科学与工程版）》2022年第3期506-512,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金(41807258);云南省万人计划“青年拔尖人才”项目。

摘　　要：为了解当前中国南方碳酸盐岩上覆红黏土龟裂的研究进展,从干缩变形、干缩裂隙和干缩进程的微观结构变化三个方面对国内外相关研究进行了总结.结果表明:初始含水率越大,初始干密度和压实度越小,收缩性越强;温度越高,收缩率越大;收缩曲线和收缩时程曲线均分为3个阶段;干湿循环产生的干缩变形是不可逆的;干缩循环次数增加,收缩率增大,并趋于稳定值,裂隙网络更加复杂;干缩变形表现出各向异性.未来的研究方向:干缩变形、干缩裂隙、微观结构变化3者耦合的龟裂宏微观综合研究;蒸发特性与干缩裂隙性的耦合过程;龟裂形成的理论研究和数值模拟;红黏土与普通黏性土、膨胀土的龟裂对比研究.In order to understand the current research progress of red clay cracking on carbonate rocks in South China,the related research at home and abroad was summarized from three aspects:shrinkage deformation,shrinkage cracks and microstructure changes during shrinkage.The results show that the larger the initial moisture content is,the smaller the initial dry density and compactness are,and the stronger the shrinkage is.The higher the temperature,the greater the shrinkage rate,and the contraction curve and the contraction time history curve are all divided into three stages.The shrinkage deformation caused by wet-dry cycle is irreversible.With the increase of drying shrinkage cycles,the shrinkage rate increases and tends to a stable value,and the fracture network becomes more complex.Dry shrinkage deformation shows anisotropy.Future research directions include:macro-micro comprehensive research on cracking coupled with shrinkage deformation,shrinkage crack and microstructure change;study on the coupling process of evaporation characteristics and dry shrinkage cracking;theoretical study and numerical simulation of crack formation;comparative study on cracking of red clay,common cohesive soil and expansive soil.

关 键 词：土体龟裂 红黏土 干缩变形 干缩裂隙 微观结构 蒸发特性 

分 类 号：TU443[建筑科学—岩土工程]