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红粘土作为一种典型的特殊土,在广西桂林市广泛分布,为保证红粘土路基的稳定性,针对桂林红粘土,通过湿法击实制备最佳含水率下的粘土试样,通过室内变水头渗透试验,发现红粘土渗透系数随着压实度增大呈指数关系下降;根据室内三轴试验,得到不同压实度下红粘土的抗剪强度指标变化规律,随着压实度增高,粘聚力呈指数函数关系增大,内摩擦角呈二次函数关系先增大后减小;综合所得结果分析了压实作用对广西红粘土性能的影响机理,建议路基施工中应控制压实度在94%以上。
As a typical special soil, red clay is widely distributed in Guilin, Guangxi. In order to ensure the stability of red clay subgrade, clay samples with the best moisture content were prepared by wet compaction. The results showed that the permeability coefficient of red clay decreased exponentially with the increase of compaction degree. According to the indoor triaxial test, the change law of shear strength index of red clay under different compaction degrees was obtained. With the increase of compaction degree, The cohesive force increases exponentially, the internal friction angle increases quadratically firstly and then decreases. Based on the results, the influence mechanism of compaction on the behavior of Guangxi red clay is analyzed. It is suggested that compaction should be controlled during subgrade construction Degree above 94%.