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以工程中常遇到的砂土和粉土为研究对象,对其进行土水特性试验和不同初始饱和度下的直剪试验,研究其土水特性和强度特性,重点研究其非饱和抗剪强度与饱和度间的关系。结果表明:在同一正应力下,非饱和状态的砂土和粉土的抗剪强度都随着饱和度的增大呈先增大后减小的变化,存在一个峰值;内摩擦角随着饱和度的变化不大,可视为常数。此外,根据实测的土水特征曲线,用平均骨架应力作为有效应力的强度算式对非饱和砂土和粉土的抗剪强度进行了预测,并与实测值进行对比,两者比较一致。
Sand and silt, which are often encountered in engineering, are selected as the research object. Soil-water characteristics tests and direct shear tests under different initial saturations are conducted to study the characteristics of soil-water and soil strength. The unsaturated shear strength And the relationship between saturation. The results show that under the same normal stress, the shear strength of sandy soil and silt in unsaturated state increases first and then decreases with the increase of saturation, and there is a peak. The internal friction angle increases with the increase of saturation Degree changes little, can be regarded as constant. In addition, based on the measured soil-water characteristic curves, the shear strength of unsaturated sands and silts are predicted by using the average frame stress as the effective stress intensity formula, and compared with the measured values, the two are in good agreement.