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Microstructure of breeze of volcanic breccia was analyzed by scanning electron microscope, uniaxial compression and creep test were completed. Study results indicate that microstructure of breeze of volcanic breccia is compact size of the particles cemented structure. Immediate deformation of creep test specimen was above 80% of total deformation, and stress threshold existed in the rock creep. When...
In order to reveal the rock breaking mechanism of the rotary-percussive drilling, considering the coupling effect of the static pressure, impact force and rotary cutting and using the finite element methods (FEM), a three-dimensional (3D) insert-rock mutual action model is established. We use a Mohr-Coulomb type material model to describe when and how rock fails, and a triangular wave to replace the...
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