【摘要】 通过杭州典型粉砂土的固结不排水动三轴试验,研究了不同围压、频率和固结比条件下的循环荷载对杭州粉砂土动孔压增长的影响,分析了在不同频率、不同固结比、不同围压作用下,杭州粉砂土的孔隙水压力变化规律,发现固结比对孔压增长影响显著;同时通过对张模型、改进的张模型和双曲线模型进行对比,总结出分段式孔压增长模型,上升段用双曲线模型进行拟合,稳定段选用线性模型,构建了适合杭州粉砂土孔压发展的模型,并明确提出了相应条件下的模型对应参数值.更多还原

【Abstract】 Based on the undrained dynamic triaxial test on the typical silt soil in Hangzhou,the effects of cyclic loading on the development of pore water pressure in sand soil in Hangzhou under different confining pressures,frequencies,and consolidation ratios are studied.The variation of pore water pressure in silt soil in Hangzhou is analyzed for different frequencies,confining pressures,and consolidation ratios.It is found that the consolidation ratio has a significant effect on the development of pore water pressure.At the same time,through comparisons of the Zhang model,the improved Zhang model,and the hyperbola curve model,apiece-wise model of pore water pressure is proposed.In this model,the ascending and descending branches are represented by a hyperbolic curve and a straight line,respectively.Thus,a development model of pore water pressure suitable for the silt soil in Hangzhou is established and the values of the model parameters corresponding to various conditions are determined.更多还原