长径比对岩石耗散能影响的研究

he rock in the process of deformation and failure is always accompanied by energy conversion with the outside world. In order to study the influence law of length-diameter ratio on the dissipation energy of rock during deformation process. The conventional uniaxial compression test on granite specimens with different length-diameter ratios were carried in this article. The theoretical model of the influence of the ratio of length to diameter on the dissipated energy in rock deformation is presented by theoretical deduction. The theoretical solution is in good agreement with the experimental data. The analysis of experimental results and theoretical model can be obtained, the effect of specimen size on rock deformation, failure and dissipation energy in the process of deformation and destruction was studied. The study results show that there is no obvious influence of the size length on the deformation characteristics before peak strength, but there is clear effect after peak strength. The length of rock is more longer, rock is more brittle after peak and deformation is smaller, the compressive strength decreased more; The failure forms of specimen varies from vertical split to shear failure with the increase of length-diameter ratio; There is the exponential relationship between the decrease of rock dissipation energy and the increase with length-diameter ratio.