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非饱和土中的基质吸力对土体的抗剪强度具有很大的影响,为了研究非饱和网纹红土基质吸力对抗剪强度的影响,本文采用滤纸法与直剪试验法分析非饱和网纹红土抗剪强度随基质吸力的变化规律。试验结果表明:粘聚力对基质吸力和含水率变化的敏感程度高于内摩擦角;随基质吸力和含水率的增大,粘聚力都呈现出先增大后减小的变化规律,最大提高幅度达200%;内摩擦角随基质吸力的增大而增大,增大幅度约为200%,而随含水率的变化规律则相反。综合所述,可见基质吸力对非饱和网纹红土的抗剪强度具有显著增强的作用。
In order to study the effect of matric suction on the shear strength of unsaturated soil, this paper uses the filter paper method and the direct shear test method to analyze the unsaturated texture Variation of Shear Strength of Laterite with Matric suction. The experimental results show that the cohesive force is more sensitive to the change of substrate suction and moisture content than the internal friction angle. With the increase of substrate suction and water content, the cohesive force increases first and then decreases, the maximum increase Amplitude of 200%; internal friction angle increases with the increase of substrate suction, an increase of about 200%, while the change with the moisture content is the opposite. Taken together, it can be seen that the matrix suction has a significant enhancement on the shear strength of unsaturated reticulated red clay.