Microseismic monitoring based early warning method of ground pressure disaster

Abstract

The invention discloses a microseismic monitoring based early warning method of a ground pressure disaster, and belongs to the field of mine safety. The method comprises the following steps of firstlyscreening out effective microseismic events from abundant original microseismic monitoring data, establishing a microseismic data base which includes seismogenic time, three-dimensional coordinates,seismic magnitude sizes and epicentral energy of the microseismic events; secondly, calculating or judging an active stage, a time sequence concentration ratio Q[time], an active region, an epicentralconcentration ratio Q[space], a b value, a beta[n] value, an eta value and a CUFIT model in the microseismic data base, so as to calculate a time factor f1, a space factor f2 and a quantitative seismological factor f3, finally, calculating an early warning judgment target function F, and determining whether to need to carry out ground pressure disaster early warning on a field or not and a levelaccording to the F. A microseismic factor to which the method relates is specific in mathematic model and clear in physical significance; multiple indexes are comprehensively considered in an early warning target function; the quantitative description of the possibility and strong or weak extent of the ground pressure disaster can be realized; the application feasibility is good; and the early warning efficiency is high.

Description

technical field [0001] The invention belongs to the field of mine safety, and relates to an early warning method for ground pressure disasters based on microseismic monitoring, in particular to an early warning technology for judging whether there is a possibility of ground pressure disasters at a mining site. Background technique [0002] Mine mining will cause the local stress of the mine and surrounding rock system to exceed the limit, and ground pressure disasters such as roadway deformation and cracking, stope roof collapse and even rockburst will occur in the shaft and stope, which will easily cause casualties or equipment damage, affecting mineral production. The safe exploitation of resources restricts the improvement of mine economic benefits. [0003] For this reason, due to their own needs and national policy requirements, ground pressure monitoring has been widely carried out. Even many well-known mines at home and abroad have adopted international advanced micro...

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Problems solved by technology

[0002] Mine mining will cause the local stress of the mine and surrounding rock system to exceed the limit, and ground pressure disasters such as roadway deformation and cracking, stope roof collapse and even rockburst will occur in the shaft and stope, which will easily cause casualties or equipment damage, affecting mineral production. The safe mining of resources restricts the improvement of mine economic benefits

[0003] For this reason, due to their own needs and national policy requirements, ground pressure monitoring has been widely carried out. Even many well-known mines at home and abroad have adopted international advanced microseismic monitoring technology. However, due to the complexity, diversity and suddenness of ground pressure disasters from the mechanism to the disaster-causing process, the single parameter in the existing early warning methods at home and abroad aims to highlight a certain factor, and multiple parameters are used in the field. The application is prone to conflicts, forming a situation of partial generalization or neglecting the other, and often only stays at the abnormal and qualitative level of some microseismic parameters, and cannot effectively quantify the possibility of land pressure disasters, making early warning of land pressure disasters difficult and difficult. low efficiency

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