Study Of Main Controlling Factors Of Datun Mining Area And Identifying Dangerous Mining Induced Tremors

Rock burst is a destructive coal mine dynamic disaster.With the increasing of coal mining depth and the deterioration of mining conditions,the threat of rock burst to mining safety production is increasing quickly.At present the identification of disastercausing factors of rock burst is extremely vague,and simple qualitative analysis is basically based on field experience.It is impossible to accurately quantify the impact of various disaster-causing factors.At the same time,for the frequent mining tremor disasters,there is a lack of reasonable and effective identification methods and identification basis to quantify the disaster risk.Therefore,based on the geological and technical conditions of the mines in Datun mining area,this paper adopts theoretical analysis,numerical calculation and engineering practice to study the identification method of the main controlling factors of rock burst and the identification of dangerous mining tremor,and the following results have been obtained:Through the statistical analysis of dynamic manifestations and mine tremor events in Datun mining area,the laws of mine tremor activity under the influence of different geological and technical conditions of rock burst manifestations are summarized.It is found that there are frequent occurrences of mine tremor in areas with unstable roof structures such as fault structures and mined-out areas.In the remaining coal pillar areas,the bearing capacity of the coal pillars makes the roof collapse insufficient.The frequency of mine tremor events is significantly lower than in other areas,but The vertical distribution range is larger.Based on the sensitivity between impact hazard factors and the energy frequency of mine tremor,the analytic hierarchy process was used to determine the impact weights of impact hazard factors in the typical working face of Datun mining area.The results showed that the fault structure,the remaining coal pillars and the mining speed are the impact-causing factors.The main controlling factor of the disaster.Based on the results of the weight calculation,the entropy method is used to quantify the degree of influence of the impact and hazard factors on different areas of the working face.Based on the theoretical basis of the source moment tensor,Matlab numerical calculation software and particle swarm algorithm are used to calculate the source moment tensor parameters and mechanical parameters of typical working faces in different Datun mining areas,revealing the source rupture under the influence of different geological and technical conditions types and characteristics of source mechanics parameters.The results show that the rupture mode of the mine tremor in Datun mining area is dominated by tensile rupture,the source rupture mode is closely related to the roof failure and instability characteristics,and the source rupture surface parameters are closely related to the fault structure and roof failure characteristics.Under the influence of different geological conditions,there are obvious differences in the mechanical parameters of the seismic source of the mining tremor.Under the influence of the remaining coal pillars,the mechanical parameters of the mining tremor source of different fracture forms are all at the same level;under the influence of fault structure,the mechanical parameters of the seismic source are at the same level.The occurrence of the fault plane is closely related;under the influence of the fault group,the seismic moment,apparent volume and stress drop of the tensile source are higher;for the isolated working face,the rupture strength of the shear source is higher than that of the tensile source.The apparent volume and stress drop are larger,the scale of coal and rock mass involved in the fracture during the fracture process is larger,and the energy release degree is higher.The study found that the various mechanical parameters of the mining tremor in Datun mining area have varying degrees of positive correlation with the source energy.Based on this,the functional relationship between each parameter and the source energy was fitted,and the various mechanics in the mining tremor risk evaluation system were determined.For the evaluation weight of the parameters,the energy comprehensive index method for the dangerous mining tremor evaluation method and evaluation index is proposed,and the method and index are applied to the monitoring and early warning of the impact hazard and dangerous mining tremor in the Datun mining area.The paper has 66 pictures,63 tables,and 99 references.