Study on Loading Rate Effect of Rock Mechanical Properties Under Cyclic Loading and Unloading
In the process of mining,there are rocks affected by cyclic disturbances,which have significant effects on the mechanical properties of rocks.To understand the loading rate effect of rocks under different cyclic loading and unloading methods,this paper carries out constant lower limit cyclic loading and unloading,variable lower limit cyclic loading and unloading tests on sillimanite specimens with different loading rates,comparatively analyzes the deformation characteristics,the energy evolution law and the destructive characteristics of the specimens under the two cyclic loading and unloading methods with different loading rates.The test results show that the peak strength and residual deformation of the specimen have different acceleration rate effects,but the peak strength is improved compared with the conventional uniaxial compression test;with the increase of the loading rate,the input energy,elastic energy and dissipation energy of the specimen in all stages show an increasing trend,but with some differences in the form of manifestation;the destruction of the specimen and its morphology show the acceleration rate effect,and the degree of destruction is intensified with the increase of the loading rate.
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