Experimental study on dynamic parameters of frozen silty clay under cyclic loading
In order to explore the influence of cyclic load on the dynamic parameters of frozen silty clay,the GDS dynamic triaxial test system is used to study the cohesion,internal friction angle,dynamic elastic modulus and damping ratio of frozen silty clay under different vibration times.The results show that with the increase of vibration times,the cohesion of soil decreases.When the vibration times reach 12 times,the cohesion of soil basically no longer changes with the increase of vibration times.The internal friction angle increases first with the increase of the number of vibrations.When the number of vibrations reaches 12,the internal friction angle reaches a peak and then begins to decrease.The more the number of vibrations,the smaller the stress required for the soil to achieve the same dynamic strain.With the increase of dynamic strain amplitude,the dynamic elastic modulus and dynamic modulus ratio of soil decrease.Under the same strain amplitude,the dynamic elastic modulus is inversely proportional to the vibration times,and the dynamic modulus ratio is proportional to the vibration times.The initial dynamic elastic modulus decreases with the increase of vibration times.Under the same strain amplitude,the damping ratio increases with the increase of vibration times.The research results can provide theoretical guidance and reference for the selection of dynamic parameters in the process of engineering construction in cold regions.
cyclic loadingsilty claykinetic equation parameterdynamic triaxial testdynamic elastic modulusdamping ratio
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