Study On The Process And Characteristics Of Rockburst Induced By Deep Mining Disturbance

As the background of the deep mining ore body of Macheng Iron Mine.Numerical simulation experiments and meso-static stress and dynamic disturbance rockburst experiments were designed to induce rockburst inoculation experiments in complex and superimposed mining disturbance states.The process and mechanism of rockburst in deep large-scale mining were studied.The main research contents are as follows:1)The numerical model of the deep stope and roadway was constructed,and the law of energy release,transfer and accumulation of the roof,pillar and surrounding rock of the roadway in the disturbed area during the excavation process under this environment is analyzed.The stress and energy evolution law and characteristics of the rockburst inoculation process of the high energy storage rock mass are revealed.2)Based on the simulation results of rockburst incubation process,three deep mechanical models were extracted to conduct rockburst experiments induced by different radial stress and dynamic disturbance amplitude.3)Through rockburst tests on specimens under three different stress states,the critical stress index and rockburst characteristics of rockburst occurrence were revealed.The test shows that when the radial stress is 25 MPa,30MPa,35 MPa,the critical peak stress when rockburst occurs is 88 MPa,98MPa and 112 MPa respectively,and the peak stress of the specimen increases by 59%.Particle ejection,splitting into slabs,outer slab bulging,and fragment ejection are the four stages of the rockburst process.The cracks under different radial stresses are mainly tensile cracks.4)The perturbation test shows that the critical dynamic load of rockburst induced by perturbation stress is reduced by 8%,6% and 5% respectively compared with the static load,indicating that the perturbation load is more likely to induce rockburst.The fractal dimension of rockburst debris increases with the increase of dynamic disturbance load,and shear cracks dominate during rockburst.Figure 90;Table 5;Reference 61...