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Experiment evidence on the temperature dependence of desiccation cracking behavior of clayey soils

机译:黏性土壤干燥开裂行为的温度依赖性实验证据

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When drying a clayey soil, shrinkage and then cracking on soil surface occur due to water loss by evaporation, this phenomenon seems to be temperature-dependent. In the present work, experimental tests were conducted on saturated slurry to investigate the desiccation cracking behavior at three temperatures (22, 60 and 105℃). The initiation and propagation of desiccation cracks during drying was monitored using a digital camera. By applying computer image processing technique, the surface crack ratio (R_(SC)) which is the ratio of the surface area of cracks to the total surface area of specimen, was defined to quantify crack networks at different water contents. The experimental results show that the initial critical water content (W_(IC), which corresponds to the initiation of desiccation crack, increases with temperature rise. After the initiation of a crack, the ratio Rsc increases with decreasing water content and then keeps almost constant when the water content becomes lower than the critical water content (W_(FC)). By comparing the cracking curve with shrinkage curve, it has been found that the cracking curve, to some extent, reflects the shrinkage properties of soil since the W_(FC) is related to the shrinkage limit and slightly influenced by temperature.
机译:当干燥粘性土壤时,由于蒸发引起的水分流失,土壤表面会发生收缩然后开裂,这种现象似乎与温度有关。在目前的工作中,对饱和浆料进行了实验测试,以研究在三种温度(22、60和105℃)下的干燥开裂行为。使用数码相机监控干燥过程中干燥裂纹的产生和传播。通过应用计算机图像处理技术,定义了表面裂纹率(R_(SC)),即裂纹的表面积与样品总表面积的比值,以量化不同含水量下的裂纹网络。实验结果表明,初始临界水含量(W_(IC),与干燥裂纹的萌发相对应)随着温度的升高而增加;裂纹萌生后,Rsc的比值随含水率的降低而增加,然后几乎保持恒定当含水率低于临界含水率(W_(FC))时,通过比较开裂曲线和收缩率曲线,发现自W_()以来,开裂曲线在一定程度上反映了土壤的收缩特性。 FC)与收缩极限有关,并且受温度的影响很小。

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