doi:

DOI: 10.3724/SP.J.1249.2017.05501

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2017/34:5 PP.501-508

Effect of compaction degree and water content on performance of sandy silt


Abstract:
Based on the static triaxial test, the effects of sand content, compactness and water content on the stress-strain curve and shear strength were analyzed comprehensively. The tests indicate that under the same confining pressure, the sand content in silt increases with the peak strength remarkably. The silt with different sand content is characterized by strain softening while keeping low confining pressure. The strain softening phenomenon tends to be weakened when increasing confining pressure. The peak strength of silt decreases obviously with the increase of water content. Moreover, strain softening phenomenon for silt with optimum water content is obvious and the strain softening phenomenon tends to be weakened. The strain softening has been weakened and ultimately disappears with decrease of compaction degrees of silt. For the same confining pressure, the higher compaction degree is, the greater the peak strength of silt is. When lowering confining pressure, compaction degree plays a more important role in the effect of peak strength. While keeping the remained parameters identical, increasing sand content and enhancing compaction degrees or reducing water content in silt can significantly increase its cohesion, but don't obviously affect internal friction angle of silt. Generally, keeping higher compaction degree, less water content and more sand content can improve silt shear strength.

Key words:geotechnical engineering,silt,static triaxial test,sand content,compaction degree,water content

ReleaseDate:2017-10-20 02:07:31



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