南阳重塑中膨胀土脱湿全过程裂隙开裂特征及影响因素分析

发布时间：2018-11-17 08:47

【摘要】：环境温度是影响膨胀土开裂的外部因素之一,初始含水率和干密度是影响膨胀土开裂的重要内部因素。为研究膨胀土的开裂特征及影响因素,对南阳重塑中膨胀土进行了多组脱湿全过程裂隙开裂试验。研究结果表明:脱湿开裂过程可分为3个阶段,脱湿收缩与裂隙酝酿阶段、裂隙产生并迅速扩展阶段和基本稳定阶段;采用试样收缩面积加裂隙总面积之和与试样初始面积的比值计算裂隙度,可描述脱湿收缩特性和开裂孕育过程,适用于描述小试样的脱湿开裂过程;环境温度对膨胀土脱湿过程有一定影响,当试样的脱湿温度较高时,其最终的裂隙度偏小;试样初始、含水率与收缩开裂裂隙度正相关,初始干密度与收缩开裂裂隙度负相关。
[Abstract]:Environmental temperature is one of the external factors that influence the cracking of expansive soil, and the initial moisture content and dry density are the important internal factors that affect the cracking of expansive soil. In order to study the cracking characteristics and influencing factors of expansive soil, the fracture cracking tests of expansive soil in the process of dehumidification in Nanyang were carried out. The results show that the dehumidification cracking process can be divided into three stages: dehumidification shrinkage and fracture brewing stage, crack generation and rapid expansion stage and basic stable stage; The ratio of shrinkage area and the sum of total fracture area to the initial area of the specimen is used to calculate the fracture degree, which can describe the dehumidification characteristics and the process of dehumidification and inoculation, and can be used to describe the dehumidification cracking process of the small sample. Environmental temperature has a certain influence on the dehumidification process of expansive soil. When the desiccant temperature of the sample is higher, the final fracture degree is smaller, the initial moisture content is positively correlated with the shrinkage crack degree, and the initial dry density is negatively correlated with the shrinkage crack degree.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;深圳市勘察测绘院有限公司;
【基金】：“十二五”国家科技支撑计划课题(No.2011BAB10B02)
【分类号】：TU443

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