Experimental Study On Dynamic Properties Of Saturated Silty Clay Under Cyclic Loading

In order to study the dynamic deformation dynamic strength and dynamic stress-strain relationship of saturated silty clay under circulating load, the test with silty clay in a series of physical and mechanical test, by altering the confining pressure, consolidation ratio and other parameters, based on dynamic triaxial test the dynamic characteristics of saturated silty clay is studied, and the content mainly includes the following several parts:For domestic and foreign research present situation has carried on the brief review, on the basis of existing research, this paper summarizes the existing dynamic property characteristics of clayey soil, Experimental study on the dynamic characteristics of soil a brief overview of basic concepts, methods and content.Conducted a series of routine test and static test, the test including moisture content, density test, limit moisture content test and direct shear test, etc., on silty clay physical and mechanical indexes were measured, provide the basis for selecting parameters of dynamic triaxial test.The test scheme design, experiment steps, single-stage loading test and multi-stage loading test are described, the test results were analyzed briefly, the saturated silty clay dynamic strain development can be roughly classified into three categories:stable development, critical development and Break-up type development, preliminary conclusions of the dynamic strength of saturated silty clay under the influence of the initial stress state.Through further analysis on the test data, single stage of saturated soft clay under circulating load test soil sample has three kinds of deformation modes, deformation modes of each kind of test curve correlation function may be used for fitting; Single-stage saturated soft clay under circulating load are critical cyclic stress ratio, the critical cyclic stress ratio is about0.14. The initial stress condition namely, confining pressure, consolidation stress ratio on the saturated silty clay is bigger. Test is given under the condition of isotropic consolidation and to the consolidation and the dynamic strength curve, and the obtained isotropic consolidation under the condition of dynamic strength index.The important parameters in the dynamic stress strain relationship of dynamic modulus of elasticity and consolidation confining pressure, consolidation stress ratio relation curve is analyzed and compared. When the confining pressure or consolidation stress ratio increases under the condition of other conditions (other things being equal), with the increase of dynamic strain, dynamic elastic modulus increase gradually. To calculate the maximum dynamic elastic modulus value to conditions such as, mapped the dynamic shear modulus and dynamic shear strain curve.With the increase of dynamic shear strain and damping ratio of saturated silty clay, mapped the isotropic consolidation of saturated silty clay, damping ratio and dynamic shear strain relationship curve, and with the specification recommended damping ratio are compared.