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本文针对不同细粒含量的杭州饱和粉土动力特性进行了研究,并对土的微观结构进行测定,用以探究粉土的强度、动剪切模量和微观结构的关系。研究结果表明,当粉粒含量不变而粘粒含量在8%~15%之间变化时,动强度会随粘粒含量的增高呈现抛物线型变化,最低点在粘粒含量为12%附近出现;而保持粘粒含量不变,粉粒含量在40%~70%变化时,动强度随粉粒含量变化呈现单一增长。动剪切模量测定结果显示,当细粒含量变化时,最大动剪切模量G_(max)和动强度的变化规律呈正相关关系;通过电子扫描电镜对试样的微观结构进行观察,解释了由细粒含量变化而引起土样动力特性变化的内在原因。
In this paper, the dynamic characteristics of Hangzhou saturated silts with different fine-grained contents were studied, and the microstructure of soils was determined to investigate the relationship between silt strength, dynamic shear modulus and microstructure. The results show that when the clay content is constant and the clay content varies from 8% to 15%, the dynamic strength changes parabolically with the increase of the clay content, and the lowest point appears near the clay content of 12% ; While maintaining the clay content unchanged, when the content of the powder varies from 40% to 70%, the dynamic strength shows a single increase with the change of the powder content. The results of dynamic shear modulus measurement showed that the maximum dynamic shear modulus G max and the dynamic strength had a positive correlation when the content of fine particles was changed. The microstructure of the samples was observed by electron scanning electron microscope The reason for the change of dynamic characteristics of soil samples caused by the variation of fine-grained content is the inherent reason.