Experimental Study On Dynamic Strength Of Saturated Sand Under Non-Isotropic Consolidation

Saturated sand would liquefy under dynamic load such as seismic load,wave load.It has been an important subject in research on soil dynamics to prevent the liquefaction from occurring.Therefore,the study of dynamic characteristics of saturated sand under dynamic load is of great theoretical and practical significance to both the prevention and mitigation of earthquake disasters and the development of soil dynamics.For better understanding of the dynamic characteristics of saturated sand,a series of dynamic strength tests were carried out on solid cylindrical and hollow cylindrical sand by HCA under different initial conditions.Further,this paper analyzes the dynamic characteristics of saturated sand,the development law of dynamic pore pressure and effects of different factors on dynamic strength and dynamic pore pressure under the condition of non-isotropic consolidation.Main research contents are listed as follows:1.For the solid cylindrical specimen and the hollow cylindrical specimen,the dynamic stress and dynamic strain time curve of the specimen are obtained by dynamic strength test,and the dynamic stress and dynamic strain are analyzed.2.By plotting the dynamic curve under different conditions,the influence of different factors such as consolidation confining pressure,consolidation stress ratio and dynamic load amplitude on the dynamic strength of saturated sand are analyzed,and the dynamic characteristics of saturated sand are obtained.3.By plotting the dynamic index c_d,?_d and (?),(?) of the Mohr stress circle,the variation law of the internal friction angle under different consolidation stress ratio and different failure vibration conditions is analyzed.4.By plotting the relationship between dynamic pressure and vibration frequency and the relationship between dynamic pressure and strain,the development law of dynamic pore pressure of saturated sand is analyzed;through the normalization of the dynamic pore pressure,the variation law between the normalized dynamic pressure ratio and the vibration ratio is analyzed,and the influence of different factors on the dynamic pore pressure is obtained.