| Popis: |
In order to reveal the influence of loading rate on the deformation and failure of cemented waste rock filling body, uniaxial compression tests of cemented waste rock filling body under five groups of loading rates were carried out, and the changes of mechanical properties, failure mode and energy dissipation were analyzed. The results show that the peak strength and elastic modulus of cemented waste rock filling body have positive linear correlation and quadratic function growth with loading rate, respectively; with the increase of loading rate, the failure mode of filling body changes from tensile splitting failure to shear failure, and the greater the loading rate is, the greater the degree of damage is; combined with the energy evolution characteristics, the cemented waste rock filling body experiences five stages: compaction, linear elasticity, stable crack growth, accelerated crack growth and post-peak strain softening attenuation; with the increase of loading rate, the increase of total strain energy and elastic strain energy of cemented waste rock filling body is more and more, the increase of dissipation energy decreases, the proportion of elastic strain energy increases, and the pre-peak plasticity decreases. |
