| Based on the research achievements at home and abroad, Hangzhou Metro to run through a typical saturated silty soil surrounding soil as the research object, through dynamic triaxial tests and mathematical models to fit the dynamic characteristics of saturated silt under vibration bads subway conducted research and analysis, The main work carried out is that:(1) Through the typical saturated silt Hangzhou dynamic triaxial tests conducted, having studied the effects of different soil samples on the dynamic strength of the confining pressure, clay content, silt content. The relationship of soil samples under different confining pressures (τd) of the dynamic shear stress and vibration Week (Nf) of curve fitting; In the same confining pressure, respectively with different clay content and silt content of soil sample of cyclic stress ratio)(σd/2σ0) and the curves of the relationship between the vibration frequency (Nf)for fitting. To arrive at the confining pressure, fine silt content on dynamic strength of the relationship by analyzing the curve relationship.(2) Using the pore pressure model (ud/σ3=a(1-e-bN/Nf)) which is put forward by Zeng Changnv to fitting the pore water pressure data of silt with different clay content and silt content. It is found that the fitting effect is very good. So it can be fitted with uniform pore pressure development relationship. In the isotropic consolidation condition, the dynamic pore pressure development law of saturated silty soil in Hangzhou can use the pore pressure model ud/σ3=a(1-e-bN/Nf))to represent. The only difference is that the two coefficients of a and b is different. Through analyzing the data consolidation, the calculation formula which is used to calculate the coefficients a and b is proposed. |
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