Experimental study on the influence of initial stress state on the dynamic characteristics of frozen clay under principal stress rotation
In order to reveal the influence of the initial stress state on the dynamic characteristics of frozen clay under the condition of principal stress shaft rotation,a circular stress path of pure principal stress rotation was re-alized by using the frozen hollow cylindrical apparatus(FHCA),and a series of hollow torsional shear tests in laboratory were carried out on the basis of the circular stress path,and the effects of the initial stress state on the cumulative plastic strain,stress-strain hysteresis loop and dynamic modulus of frozen clay were studied.The re-sults show that the greater the initial stress of the specimen under the condition of pure principal stress rotation,the faster the cumulative plastic strain development rate of the frozen clay hollow cylindrical specimen,and the greater the final cumulative plastic strain generated.In addition,it is found that with the increase of the initial stress under the pure principal stress rotation condition,the inclination of the axial stress-strain and shear stress-strain hysteresis curves of the frozen clay specimen increases,and the axial resilience modulus and shear modu-lus of the frozen clay specimen also increase,and there is a linear relationship between the axial resilience modu-lus and shear modulus and the static deviation stress ratio under different cyclic stress ratios.This research re-sults are helpful to improve the design theory of cold region engineering and artificial freezing engineering.
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