Physically Similar Simulation Test of Induced Rock Burst under Dynamic Load
In order to study the energy release law of overlying rock under dynamic load during high-intensity mining of thick coal seam,the influence of dynamic load on overlying rock breaking law is ana-lyzed by physical similar simulation test based on field microseismic data.It is found that in the early stage of dynamic loading,the microseismic energy signals are mainly concentrated in the subcritical layer,and the microseismic signals show obvious accumulation phenomenon,and the damage has not yet appeared,and the microseismic signals are relatively weak.However,with the continuous dynamic loading,the accu-mulation gradually increases,and the microseismic signals become more obvious,suggesting the beginning of the overburden failure process.With the increase of dynamic load times,the accumulation pattern of mi-croseismic signals changes.The energy not only accumulates in the sub-critical layer,but also extends to the lower part of the main critical layer,showing a"saddle-type"distribution feature,indicating that dy-namic load accelerates the failure process of overburden rock,especially the failure of the main critical layer begins to occur in advance,and the failure amplitude and intensity gradually increase.Further analysis shows that multiple dynamic loading significantly intensifies the overburden failure,and the cyclic and cu-mulative effects of dynamic loading promote the release of overburden energy in a short period of time,re-sulting in more serious failure.The research results not only help to predict the overburden failure during coal mining,but also provide theoretical basis and technical support for improving the safety and stability of coal mining.
rock burstsimilar simulation testmicroseismic monitoring
万方数据
维普
