Rock burst early warning method based on dynamic and static load disturbance superposition

Abstract

The invention provides a rock burst early warning method based on dynamic and static load disturbance superposition. The method comprises the steps that firstly, an analytic hierarchy process is adopted for determining the dynamic and static load disturbance parameter weight, wherein static load disturbance is quantitatively described through a shock wave CT inversion wave velocity parameter, anddynamic load disturbance is quantitatively described through a microseismic accumulation shock effect parameter; and then, a weighted average method is adopted for determining a final impact dangerousarea and the danger level of the final impact dangerous area. The formula parameters involved in the method are clear in calculation, good in universality, easy to program and high in practicability,and the mine rock burst danger can be approximately early warned in real time in a large range.

Description

Technical field[0001]The present invention relates to the field of mine impact, in particular, to a mine-based impact, preloading method based on a dynamic sedation disturbance.Background technique[0002]The occurrence of impact ground pressure and the physical mechanical properties of coal rocks are related to the static load of coalstone, and when the static load of coal rock body, the superposition of the movable load exceeds the critical load of the coal rock body and the critical load of the coal rock body will be induced. Large energy ore or impact ground pressure. According to long-term theoretical research, on-site test, impact ground pressure mining fault, plaques and other geological structure and unreasonable segment coal columns, protective layer leggings, adjacent mining activities, work faces, etc., will result in local stress in surrounding rock Concentrated, the microveraint event will also appear in the above region, and the surrounding coal rock body is disturbed. T...

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Problems solved by technology

[0003] Most rock burst mines have unreasonable excavation layout or a large number of complex geological structures, which lead to significant static load disturbance of coal and rock mass due to mining secondary stress and tectonic stress, and are prone to rock burst under the action of microseismic cumulative vibration effect

However, the conventional seismic wave CT inversion technology needs to calculate the longitudinal wave velocity transmitted to the sensor by the shock wave to reflect the disturbance degree of the static load stress of the large-scale coal and rock mass. In order to obtain the static load stress distribution of the surrounding rock of the working face more accurately, A large number of microseismic events are required as the original data for inversion. The inversion calculation is large and the cycle is long, so it is difficult to achieve real-time inversion. The short-term dynamic load effect early warning of microseismic events is calculated based on the attenuation characteristics of shock waves in the coal-rock medium. Or the dynamic load disturbance of coal and rock mass near the working face. When mining earthquakes occur continuously in a certain area, the accumulated vibration effect may further induce strong mine earthquake events and even rock bursts. The short-term early warning of micro-seismic dynamic load effect has a short warning period. , close to the mining face, etc., but the effective early warning range is limited due to the fast shock wave speed

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