The Influence Of Fines Content On The Dynamic Characteristics And Microstructure Of Silt

Since the 1970 s,scholars had already started the study of the dynamic properties of silt under the traffic load,but that time more dynamics study is of silty sand.Because of the special nature of silt that silt particles can't play the same role in skeleton as sand particles in the soil and it also can't occur with a variety of stabilizers effective role,there are a considerable number of disasters happen.The last few decades,a growing number of scholars studied influences of the fines content on dynamic characteristics and liquefaction of the silt.In this paper,typical saturated silt along Xiasha Metro in Hangzhou is conducted dynamic triaxial test.We also fit dynamic pore water pressure mathematical models,evaluate dynamic shear modulus and analyze microscopic image.For the study of the dynamic characteristic and microstructure of saturated silt under cycle of vibration loads,the research targets are as follows:?1?In the same fixed confining pressure,multiple sets fines content silt samples are conducted dynamic triaxial test.The study emphases the different clay content and silt content affect dynamic strength and dynamic pore water pressure of saturated silt.The way to test is mainly by change the clay content and silt content.Then fit dynamic pore water pressure development curves and analyze the effect of different fines content on dynamic strength and pore pressure development.?2?The experimental study found that when the silt content is certain,clay content varied within the 8% to 15%,the dynamic strength curve is non-monotonic,namely clay content ranges from 8% to 12%,dynamic strength of saturated silt samples decreases with clay content increasing.While the clay content ranges from 12% to 15%,it increases with clay content increasing.Saturated silt dynamic intensity changes direction when Clay content at 12 %.?3?We test maximum dynamic shear modulus of silt samples by GDS triaxial piezoelectric ceramic bending element test.Analyze the G_max of different fine silt.?4?We do the silt scanning electron microscopy?SEM?test.It helps to analyze the relationship between its macroscopic physical properties and microstructure.