Abstract:To study the energy evolution of the slope of a jointed rock mass under increasing mining depth and strength reduction factor.In this paper, combined with the field investigation and indoor test results, 3DEC is used to establish a three-dimensional model of a smooth-layer slope in Yunnan, and analyze the energy and plastic zone of the slope of the jointed rock body based on the principle of thermodynamics and the discrete unit method.The results show that the amount of elastic strain energy and gravitational potential energy change decreases gradually with the increase of mining depth;dissipative energy rises gradually and then levels off, kinetic energy rises and then falls.With the increase of the strength reduction factor, the dissipation energy and gravitational potential energy change gradually rise,the elastic strain energy first rises and then falls,the kinetic energy shows a fluctuating tendency of first rising and then falling and then rising and falling again,The plastic zone of the nodular rock mass slope gradually expands, the tensile damage area appears at the top of the slope, the shear yielding is distributed along the structural surface and through the vicinity of the slope surface, and the overall slope destabilization occurs.