Study On Deformation And Penetration Behavior Of Crushed Rock Under Shear Action

Mine water inrush disaster has seriously threatened the safety production of China’s coal mines.Fault activation and water inrush is one of the main forms of mine water inrush accidents.The fault fractured rock mass has shear deformation under the influence of mining and is connected with mining fracture,thus inducing fault water inrush accident.In this paper,by means of theoretical analysis,experimental test and numerical simulation,the change law and internal mechanism of the permeability parameters in the shear deformation of the broken rock in the fault are systematically studied,the evolution law of the seepage field in the fault and the mechanism of the fault activation of the fault caused by the shear failure of the filling are analyzed.Fruit:（1）A set of shear seepage coupling test rig composed of shear loading system,permeation loop,confining loop and measuring system is developed,and a corresponding test method is put forward.（2）The influence of confining pressure,particle gradation（Talbot index）and initial porosity on the shear deformation and permeability parameters of fractured rocks is obtained through the shear seepage coupling test of fractured rocks.（3）The mechanical model of coal seam floor filling fault is established,and the forming conditions of fault water inrush channel are analyzed,and the influencing factors of fault water inrush are analyzed.（4）According to the experimental and numerical simulation results,the stress permeability relation of fractured rock mass is put forward,and a numerical model with fault mining under different hydrogeological conditions is constructed with FLAC^3D,and the stress field and the seepage field evolution characteristics of the interruption layer in the mining process are analyzed,and the stress field and displacement field of the surrounding rock in the interruption layer of the working face are obtained.The influence of the plastic zone and the seepage field,and the analysis of the particle size distribution of the fractured rock mass and the evolution law of the amount of the initial porosity to the frontal amount of the seepage field are analyzed,and the precursor law and prevention measures for the activated bursting of the fault are put forward.