桂林重塑红粘土裂隙发育特性研究  

Study on Crack Development Characteristics of Remolded Red Clay in Guilin

作　　者：张炳晖 刘磊[1,2] 刘宝臣 曾庆建 谢艳华[4] 曹贤发 ZHANG Binghui;LIU Lei;LIU Baochen;ZENG Qingjian;XIE Yanhua;CAO Xanfa(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,Guangxi,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,Guangxi,China;Guangxi Polytechnic of Construction,Nanning 530007,Guangxi,China;Guilin University of Aerospace Technology,Guilin 541004,Guangxi,China)

机构地区：[1]广西建筑新能源与节能重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]广西建设职业技术学院,广西南宁530007 [4]桂林航天工业学院,广西桂林541004

出　　处：《水力发电》2020年第8期109-113,共5页Water Power

基　　金：国家自然科学基金资助项目(11562007);广西自然科学基金项目(2018GXNSFAA138139);广西建筑新能源与节能重点实验室基金项目(桂科能16-J-21-6、桂科能19-J-21-21)。

摘　　要：对桂林重塑红粘土裂隙发育特性进行室内干湿循环试验,并结合分形特征对裂隙进行分析。结果表明,桂林重塑红粘土在初次干湿循环主要进行环向收缩,无明显表面裂隙;重塑红粘土裂隙随干湿循环次数增加逐渐发育,裂隙率、分形维数、裂隙总长度增大,而裂隙平均宽度存在增大后减小的现象;随干湿循环次数增加,试样裂隙率随初始含水率增加而减小,随初始含水率及干密度增加,分形维数减小,而裂隙总长度、裂隙平均宽度与初始含水率、干密度之间未表现出明显规律;当初始含水率高于最优含水率达到31%时,试样表面裂隙发育不明显;在第2至第5次干湿循环中,试样裂隙率与分形维数相关性较高。The indoor dry-wet circulation test is carried out to study the crack development characteristics of remolded red clay in Guilin,and the fractures are analyzed based on the fractal characteristics.The results show that,(a)the remolded red clay in Guilin in the first dry-wet cycle is mainly contracted without obvious surface cracking;(b)with the increase of dry-wet cycles,the fracture rate,fractal dimension and total crack length increase,while the average crack width decreases after increasing;(c)with the increase of dry-wet cycles,the fracture rate of sample decreases with the increase of initial moisture content,while the fractal dimension decreases with the increase of initial moisture content and dry density,but there is no obvious rule between the total crack length,the average crack width and the initial moisture content and dry density;(d)when the initial moisture content is higher than the optimal moisture content and reaches 31%,the crack development on the sample surface is not obvious;and(e)from the 2nd to 5th dry-wet cycle,the sample fracture rate is highly correlated with the fractal dimension.

关 键 词：红粘土 干湿循环 数字图像处理 裂隙发育特性 

分 类 号：TU411.3[建筑科学—岩土工程]