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土水特征曲线指的是非饱和土中,基质吸力与含水量的变化关系曲线。非饱和土的抗剪强度、渗透系数、变形特性都与土水特征曲线有关。通过改装的非饱和固结仪,对非饱和膨胀土土水特征曲线进行测定,并对所获得的土水特征曲线进行拟合分析。分析结果显示:所得的膨胀土土水特征曲线符合一般规律,可以为进一步的非饱和抗剪强度试验提供可靠的参数,为工程实践提供试验依据。
Soil water characteristic curve refers to the unsaturated soil, the matrix suction and water content curve. The shear strength, permeability coefficient and deformation characteristics of unsaturated soils are related to the soil-water characteristic curves. The soil-water characteristic curve of unsaturated expansive soil was measured by modified unsaturated consolidation instrument, and the soil-water characteristic curve obtained was fitted and analyzed. The analysis results show that the obtained expansive soil-water characteristic curve accords with the general law, which can provide reliable parameters for further tests of unsaturated shear strength and provide experimental basis for engineering practice.