| The process of rock friction and sliding is a difficult problem in the study of rock mechanics.It is the basis to understand the mechanism of rock friction and sliding and to establish the theoretical model to study with experiment.Paper in view of the rock friction and sliding characteristics of inhomogeneous evolution,with the digital speckle correlation method as a means of experimental observation,through the deformation measurement system with the CCD camera,by using the double side shear model experiment method,set up the influence of the loading rate,confining pressure and loading and unloading rock friction and sliding experiment,seek rock mechanical response characteristics and parameters in the process of friction and sliding.In the influence of loading rate of rock friction and sliding non-uniform deformation evolution characteristics of the experimental research,by the double shear experiments under different loading rate,the duration of each stage of loading rate on the load and horizontal displacement isoline distribution characteristics of the specimen was got.The rock in the process of the friction and sliding interface sliding displacement and strain field non-uniform statistical indicators with increasing loading rate evolution characteristics was received.The bond-slip before loading rate for the first time and evolution regularity of deformation energy density was summarized.In the influence of confining pressure of rock friction and sliding non-uniform deformation evolution characteristics of the experimental research,by the double shear experiments under different confining pressure,the relationships between confining pressure and the shear stress before the first slippage,the first stress drop and the duration of the linear growth of shear stress were obtained.The evolution characteristics of the interface sliding displacement with the increase of confiningpressure in the process of rock friction sliding and the first viscous sliding were given.The influence of confining pressure on the evolution characteristics of deformation energy density and non-uniform statistical index of deformation field during rock friction sliding and before and after the first viscous sliding were summarized.It was pointed out that the larger the confining pressure was,the more the specimen tends to release the deformation energy.In the influence of loading and unloading of rock friction and sliding non-uniform deformation evolution characteristics of the experimental research,by the double shear experiments under different confining pressure,the evolution law of horizontal displacement field and interface sliding displacement of specimens with the increase of loading and unloading times at the same shear stress level was obtained.The viewpoint that there was accumulation and hysteresis of specimen deformation in the process of rock friction and sliding was put forward.The non-uniform statistical index of deformation field and the characteristic index of deformation energy density at the same shear stress level were analyzed.The influence of increasing loading and unloading times on their evolution characteristics was summarized. |
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