Experimental Study on Post-Peak Failure Behavior of Rock Masses with Persistent Joint

Abstract

The uniaxial compression test on pre-existing persistent jointed rock cylindrical standard specimen made by high stiffness servo control testing machine, systematic researched the relationship between jointed rock post-peak stress-strain curve, the destroy form of rock masses with dip angles of persistent joints. And the results reveal that: (1) The post-peak stress - strain curves of specimens with joint inclination angle of 15°and complete specimens are basically the same, but the difference of post-peak stress - strain curves of specimens with the joint inclination angle from 30°to 60°and complete specimens is vary greatly; (2) The post-peak failure modes of specimen change with different joint inclination. The research result can reflect mechanics and deformation and damage characteristics under uniaxial compressive loading in the phase of post-peak of rock masses with different dip angle pre-existing persistent joints.