Study on the energy evolution law of jointed rock slopes under excavation action
To study the energy evolution of the jointed rock slope under increasing mining depth and strength reduction factor.In this paper,combined with the field investigation and indoor test results,3DEC was used to establish a three-dimensional model of a smooth-layer slope in Yunnan,and the energy and plastic zone of the jointed rock slope based on the principle of thermodynamics and the discrete unit method were analyzed.With the increase of mining depth,the changes of elastic strain energy and gravitational potential energy gradually decreased,the dissipation energy gradually increased and then leveled off,and the kinetic energy firstly increased and then decreased.With the increase of strength reduction coefficient,elastic strain energy,dissipation energy and gravitational potential energy changes gradually rise,and kinetic energy shows a fluctuating trend of firstly rising,then falling,then rising and then falling.The plastic zone of the jointed rock slope gradually expanded,the tensile damage area appeared at the top of the slope,the shear yielding was distributed along the structural surface and near the slope surface through,and the slope was destabilized as a whole.When the mining depth and strength reduction factor increase,except for the kinetic energy to keep the static equilibrium,the rest of the energy of the slope shows a certain rule of change.Significance:This paper reveals the change rule of various energies when slope damage occurs,and provides new ideas for future slope instability early warning research.
gradual slopejointed rockthermodynamicdiscrete element methodmine depthreduction factor
NETL
NSTL
万方数据
