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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。
Ambient temperature is one of the external factors affecting the cracking of expansive soil. The initial moisture content and dry density are the important internal factors that affect the cracking of expansive soil. In order to study the characteristics of cracking of expansive soils and their influencing factors, the cracking of expansive soils in Nanyang during the whole process of dehumidification was studied. The results show that the dehumidifying and cracking process can be divided into three stages: dehumidification shrinkage and fissure brewing stage, fissure generation and rapid expansion phase and basic stability stage; using the sum of the specimen shrinkage area plus the total crack area and the initial area of the sample Ratio can be used to calculate the degree of fissure. Desiccant shrinkage characteristics and the process of fissuring can be described. It is suitable for describing the dehumidifying and cracking process of small samples. The ambient temperature has certain influence on the desorption process of expansive soil. When the desorption temperature of the sample is relatively high The final fracture degree is small. At the initial stage of the sample, the moisture content is positively correlated with the shrinkage cracking fracture degree. The initial dry density is inversely related to the shrinkage cracking fracture degree.