珞珈山粘土强度规律的试验研究

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、压实含水量度压实土体的饱和状态三因素对粘土抗剪强度厦强度参数的影响，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，浸水饱和后粘聚力套大大降低，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．

Experimental Study on the Shear Strength of Luojiashan Clay

An experimental study on the shear strength of Luojiashan Clay at Wuhan University was carried out.In order to discuss the influence of degree of compaction,compaction water content and saturation state of compacted soil on the shear strength of the clay,direct shear tests of 21 groups of specimens compacted on different water content and different degrees of compaction were done.The mechanism of the influence was analyzed from two aspects of soil structure and variation of water content of clay.Results show that degree of compaction,compaction water content and saturation state of compacted soil have influence on cohesion and angle of friction of clay,thereby on the shear strength of clay.Cohesion isn't increasing simply with compaction water content increasing,and the curve of cohesion versus compaction water content looks like the transformed S-type.At low compaction water content cohesion increases with degree of compaction but it is hardly affected by degree of compaction at high compaction water content.Soaking leads to a significant reduction of cohesion.The higher is the degree of compaction or the lower is the compaction water content,the more loss is the cohesion by soaking.Angle of friction increases with compaction water content increasing but the variation law of angle of friction with degree of compaction is not clear and the angle of friction has few loss by soaking.5figs.,2tabs.,10refs.