Research progress on mine earthquake mechanism and secondary disaster monitoring technology
Mine earthquake is an inevitable dynamic phenomenon in deep mine mining.With the increase of mining depth,the frequency and influence range of mine earthquake show an upward trend.The dynamic disasters of composite coal rock occur frequently,which seriously threatens the safe mining of coal mine and has a bad impact on the realization of‘double carbon'target.Safe,accurate and reliable monitoring methods are the basis and premise of mine earthquake disaster prevention and control.Microseismic monitoring system can accurately reflect the state of coal rock and carry out risk assessment in advance by relying on mine earthquake wave signal,and has been widely used in underground mine earthquake monitoring.This paper reviews the three aspects of mine earthquake identification,microseismic monitoring and secondary disaster warning.The development process of mine earthquake mechanism and identification classification is reviewed.The characteristic signals,influencing factors and constraints of microseismic monitoring technology in the field of mine earthquake are analyzed.The microseismic monitoring technology is briefly introduced and reviewed according to the classification criteria such as monitoring purpose,signal acquisition mode and frequency band interval.On this basis,through field cases and experimental research and analysis,the theoretical basis and preliminary exploration of mine earthquake as the precursor warning information of coal-rock dynamic disaster are elaborated in detail.The contradiction between the small coverage area of the current microseismic monitoring system and the large demand for mine earthquake monitoring scale is summarized.Combined with the advantages of macro-scale verification of seismic monitoring network and micro-positioning analysis of microseismic monitoring,the idea of long-distance non-contact mine earthquake monitoring network is proposed.It provides a new idea for the development and research of mine earthquake mechanism and precursory information early warning in the future.
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