干湿循环下南阳膨胀土的土水和变形特性

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对初始状态相同南阳膨胀土试样进行1~6次干湿循环,选取其中的1、3、6次循环后的试样,采用饱和盐溶液蒸汽平衡法测定其含水率、孔隙比、饱和度等与吸力的关系,并对比分析干湿循环对南阳膨胀土的持水能力影响。在1~6次干湿循环过程中,以环刀为参照物拍摄每次烘干后试样上表面照片,用数字图像处理提取图像中的裂隙与收缩面积,以此分析试样烘干过程中裂隙与收缩与干湿循环次数的关系。试验结果表明,干湿循环过程中相同吸力的试样含水率略降低、孔隙比略增大、持水能力略降低,烘干过程中试样收缩面积增大,裂隙展开面积增大,但上述性质变化幅度都随干湿循环次数增加而减小。试验成果为研究膨胀土的持水能力和湿胀干缩变形性质随干湿循环的变化规律提供实测数据。 The same initial state of Nanyang expansive soil samples 1 to 6 times the wet-dry cycle, select one of the samples after 1,3,6 cycles, using saturated salt solution vapor balance method to measure the moisture content, porosity, saturation And the relationship between the suction and comparative analysis of wet and dry cycle of Nanyang expansive soil water holding capacity. In 1 to 6 times during the wet-dry cycle, taking the ring knife as the reference material, the upper surface of each sample after drying was photographed, and the image was cracked and contracted by using digital image processing to analyze the sample drying process Relationship between cracks and shrinkage and the number of wet and dry cycles. The experimental results show that the moisture content of the sample with the same suction decreases slightly during the wet-dry cycle, the void ratio slightly increases, the water holding capacity slightly decreases, the shrinkage area of ​​the sample increases during drying and the area of ​​the crack expansion increases, The magnitude of the change of nature decreases with the increase of the number of wet-dry cycles. The experimental results provide experimental data for studying the water holding capacity of expansive soils and the deformation and shrinkage properties of the specimens.
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