| Under the influence of regional tectonic stress,the phenomenon of rock burst occurred frequently in the process of mining in Huayan Mine,which seriously affects the safety production and economic benefits of the mine.The monitoring and early warning technology of rock burst is the key to improve the prevention and control level,and it has important guiding significance for disaster avoidance and decision making in coal mine.Therefore,it is of great guiding significance to further study the monitoring and early warning technology of rock burst and form a scientific,reasonable and efficient space-time monitoring and early warning technology of multi-dimensional information fusion for the defense,reduction and control of dynamic disaster of rock burst.This paper around "Spatiotemporal monitoring and early warning model of multi-source information fusion for rock burst in Huayan mine",using the research methods include theoretical analysis,mathematical statistics,field monitoring,numerical calculation and engineering practice,systematic analysis of the characteristics of large energy distribution of two typical working faces in Huayan mine,study on the identification of multi-source precursor information of rock burst in Huayan mine,put forward the spatiotemporal monitoring and warning model of multi-source information fusion of rock burst,and it is applied in the field to test its practicability.The following research results have been obtained:(1)Through the analysis of the microseismic data of two typical working faces during mining in Huayan mine,the distribution of large energy microseismic events has the following characteristics:(1)Most of the large energy microseismic events are located in the advance bearing stress affected area in front of the working face,and are induced by the high static stress caused by the working face mining;(2)Some large energy microseismic events are located behind the advancing position of the working face,which are mainly induced by the roof strata rupture behind the working face.(3)In other stress concentration abnormal areas,because of the high static stress in coal and rock mass,it is also easy to induce large energy microseismic events;(4)In the far ahead position of the working face,there are very few large energy microseismic events,which are affected by the geological defect area and the mining pressure relief area.(2)through the analysis of coal rock stress-strain full curves and field stress evolution process of coal or rock,combined with the large energy microseismic events distribution characteristics,it is found that the rock burst induced by the dynamic-static load superposition has four basic types: high static load(high static load + low dynamic load),high dynamic load(low static load + high dynamic load),abnormal stress concentration and low critical load.The dynamic-static load superposition mechanism provides a basis for the identification of multi-source precursor information of rock burst and the selection of indicators.(3)Aiming at the rock burst precursor information identification is not clear,cannot effectively using the monitoring data abundant physical information of the problem,analyzes the microseismic monitoring,ground sound monitoring,drilling cuttings monitoring,stress online monitoring,support resistance monitoring multi-source information identification,selection of seismic energy,frequency,energy/frequency rate,sound energy/frequency rate of hours,shift and day,rate of pulverized coal cuttings index,stress values and stress rate,support resistance value as rock burst monitoring temporal or spatial index.(4)Aiming at the rock burst monitoring method is numerous,the early monitoring warning index of different dimensional problems,the quantitative monitoring and early warning models of rock burst,such as microseismic monitoring,ground sound monitoring,drilling cuttings monitoring,online stress monitoring and support resistance monitoring are established,and combining with various warning models,the spatiotemporal comprehensive monitoring and warning model of rock burst with multi-source information fusion is established,which can quantitatively reflect the impact risk of the monitored area.(5)Based on the idea of constructing multi-source spatiotemporal comprehensive early warning model of rock burst,the spatiotemporal comprehensive monitoring and early warning model of specific multi-source information fusion of rock burst at two typical working faces in Huayan mine is established.The results show that the time series comprehensive warning model of the multi-source information fusion of rock burst in250102-2 working face the accuracy rate of seismic detection of the level 3 warning is 100%and the forecast efficiency is 0.48.The accuracy rate of seismic detection of the level 4warning is 86%,and the forecast efficiency is 0.57.The time series comprehensive warning model of 250208 working face the accuracy rate of seismic detection of the level 3 warning is 100% and the forecast efficiency is 0.65.The accuracy rate of seismic detection of the level 4 warning is 82%,and the forecast efficiency is 0.70,which reduces the omission alarm rate of the working face.The spatial comprehensive early warning model based on the multi-source information fusion of rock burst can quantitatively reflect the impact risk of the monitored area in the monitoring period.The research results of this paper can effectively guide the safety production of Huayan Mine.In the mining process of the subsequent working face,when the time-series comprehensive early warning model is adopted,when the forecast level is 3 or above,it indicates that the working face has impact risk.The space comprehensive early warning model can be used to guide the pressure relief,danger relief and strengthen support.which can reduce the blindness of the site construction to a certain extent and effectively ensure the safety of the work face.There are 78 pictures,11 tables and 97 references in this paper. |
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