论文部分内容阅读
为了探讨干湿循环和含水率对豫东粉土路基强度的影响,对经历多次干湿循环、初始压实度不同的饱和粉土试样和未经历干湿循环、初始含水率不同的非饱和粉土试样进行了一系列直剪试验。试验结果表明:干湿循环、含水率和压实度对黏聚力影响明显,而内摩擦角受上述3种因素影响较小。通过试验得出任意干湿循环次数、含水率和压实度条件下豫东粉土黏聚力的实用公式。最后结合豫东粉土的土水特征曲线探讨了Bishop和Fredlund非饱和土强度公式的局限性,提出预测豫东非饱和粉土抗剪强度的实用公式。
In order to investigate the influence of the wetting and drying cycles and moisture content on the silty subgrade strength of Yudong soil, the saturated silt samples with different initial compaction degrees, Saturated silt samples were subjected to a series of direct shear tests. The experimental results show that: the wet-dry cycle, moisture content and degree of compaction have a significant impact on cohesion, while the internal friction angle is less affected by the above three factors. The practical formula for the cohesion of silt in Yudong is obtained through experiments with the number of wet-dry cycles, moisture content and compaction degree. Finally, combining with the soil-water characteristic curves of silt in Yudong, the limitations of the formula for strength of Bishop and Fredlund unsaturated soils are discussed, and a practical formula for predicting the shear strength of unsaturated silts in eastern Henan is proposed.