Test Analysis On Dynamic Characteristic And Parameter Of Composite Soil With Vertical Reinforced Materials

Based on analyzing and summarizing the previous study results of composite foundation,the dynamic characteristics of silt specimens and composite specimens which are treated with cement-mixing piles,lime soil pile or cement flyash gravel pile are compared and analyzed.The dynamic constitutive relation and the dynamic modulus are investigated according to the data obtained by dynamic triaxial tests under different conditions such as confining pressure,replacement ratio,initial dry density and initial water content.The empirical relations of the dynamic characteristics of three different composite specimens with respect to various influence factors are found.Lastly,the dynamic characteristics of three different composite specimens are compared and analyzed,the influence of vertical reinforced materials on composite soil is studied.In this paper, the regularity of the composite specimen's primary dynamic modulus is obtained from dynamic triaxial tests with respect to the various influence factors such as confining pressure, replacement ratio,dry density and initial water content. The general tendency is : the dynamic constitutive relationship of composite specimens,treated with three different reinforced materials,can be approximately expressed with hyperbola.The curves ofσ_d versusε_d for composite specimens are similar to silt's.For composite specimens,when conditions are same,it needs more stress to get a certain strain.If other conditions are same,stress which is needed for obtaining same strain increases with the increase of confining pressure,replacement ratio,initial dry density or rigidity of vertical reinforced materials,and decreases with the increase of initial water content.The curves of E_d versusε_d for three kinds of composite specimens are similar to silt's,the dynamic modulus increase greatly at same strain;if other conditions are same,the dynamic modulus increase with the increase of confining pressure,replacement ratio,initial dry density or rigidity of vertical reinforced materials,and decrease with the increase of initial water content.Variation regularity of maximum dynamic modulus is that,if other conditions are same, maximum dynamic modulus increases with the increase of confining pressure,replacement ratio,initial dry density or rigidity of vertical reinforced materials,and decreases with the increase of initial water content.