含水量对压实粘土的变形及强度性能的影响

通过室内压缩试验和直剪试验,研究了含水量对压实粘土的压缩变形与抗剪强度的影响,并从土体结构与土中基质吸力变化两个方面分析了作用机理。试验表明:随压实含水量增大,粘土的压缩变形增加、抗剪强度降低;粘聚力随压实含水量增加并非单调变化,其曲线形式类似于“”形;内摩擦角随压实含水量增加,大体上是减小的。压实粘土浸水饱和后,压缩变形显著增加,抗剪强度和粘聚力则显著降低。且压实含水量越小的土体在其他条件相同时,因饱和引起的压缩变形、抗剪强度和粘聚力损失较大,内摩擦角受浸水饱和的影响较小。

Effects of Moisture Content on Compression Deformation and Shear Strength of Compacted Clay

The effects of moisture content on the compression deformation and shear strength of a compacted clay by carrying out compression tests and direct shear tests are studied,and the mechanism of the influence from two aspects of soil structure and variation of matrix suction in clay are analyzed.The results of the tests show that with compaction water content increasing,the compression deformation increases,the shear strength decreases and angle of friction also decreases.Cohesion doesn't increase simply with compaction water content increasing,and the curve of cohesion versus compaction water content looks like a shape of "".Soaking leads to a significant increase in compression deformation and a significant reduction in shear strength and cohesion.The lower is compaction water content,the greater is compression deformation and the more loss is shear strength and cohesion by soaking at same other conditions.Angle of friction has few loss by soaking.