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对武汉大学珞珈山粘土完成了21组不同含水量和压实度的室内直剪试验,讨论压实度、压实含水量及压实土体的饱和状态三因素对粘土抗剪强度及强度参数的影响,并从土体结构与土中水分变化两个方面分析了影响机理.试验表明,压实度、压实含水量及土体饱和状态对粘聚力和内摩擦角有影响,从而使抗剪强度也受到三因素的影响.粘聚力随压实含水量的增加不是单调变化的,其曲线型式类似于“倒S”型,在低压实含水量下随压实度的增加而增加、高压实含水量下受压实度影响不大,浸水饱和后粘聚力会大大降低,且压实度大、压实含水量低的土体饱和后粘聚力损失更大;内摩擦角随压实含水量的增加大体上是减小的,受压实度影响的规律性较差,受浸水饱和影响较小.图5,表2,参10.
21 sets of indoor direct shear tests with different water content and compaction degree were completed in Luojia Mountain clay of Wuhan University. The three factors of compaction degree, compacted water content and saturated soil compaction were used to study the shear strength and strength of clay The influence mechanism is analyzed from two aspects: the structure of soil and the change of moisture in soil.The results show that the degree of cohesion and internal friction is affected by the degree of compaction, compacted water content and soil saturation The shear strength is also affected by three factors.Coagulation with the increase of compacted water content is not monotonous change, the curve is similar to the “inverted S” type, with low compaction water content with the compaction degree increases However, the cohesive force will be greatly reduced when saturated with water saturated, and the compaction degree is large. The soil with low compacted water content will have a greater loss of cohesion after being saturated. The internal friction angle decreases with the increase of compacted water content, the regularity influenced by compaction degree is less, and the infiltration saturation is less affected.