干湿循环条件下有机聚合物复合黏土保水与开裂特性研究

针对添加不同浓度有机聚合物的复合黏性土开展室内干湿循环蒸发试验,通过记录试验过程中试样的含水率变化以及获取裂隙发育特征图片,以研究聚合物浓度的变化、干湿循环次数对黏性土内部的水分变化以及干缩开裂的影响.试验结果表明:(1)黏土干燥失水过程主要分为三个阶段,土体内部水分散失主要发生在常速率蒸发阶段,由于聚合物与水反应所形...

Study on Water-retention and Cracking Characteristics of Organic Polymer Composite Clay under Dry-wet Cycling

The indoor drying-wetting cycle tests of composite clayey soil with different concentrations of organic polymer were carried out. By recording the change of water content of the sample and obtaining the characteristic pictures of crack development, the influence of the change of polymer concentration and the number of drying-wetting cycles on the moisture change and desiccation cracking of clayey soil was studied. The results show that: (1) the drying and water loss process of clay can be divided into three stages, and the internal water loss mainly occurs in the constant rate evaporation stage. Because the elastic membrane formed by the reaction of curing agent and water will block the "hydrophobic channel" in the soil, the water holding capacity of the soil will be gradually improved with the increase of the concentration of the polymer, and the time of constant rate evaporation stage was prolonged to some extent. (2) With the increase of the number of drying-wetting cycles, the cracks on the surface of the samples will be "healed" in different degrees. However, with the increase of the concentration of polymer, the soil particles are wrapped and cemented by elastic membrane, and the surface crack morphology of the samples changes little, and the overall stability is improved.