A method for early warning of rock burst based on dynamic and static load disturbance superposition

Abstract

The present invention proposes a rock burst early warning method based on the superimposition of dynamic and static load disturbances. Firstly, the analytic hierarchy process is used to determine the weight of the dynamic and static load disturbance parameters. Quantitative characterization of accumulated vibration effect parameters; then the weighted average method is used to determine the final shock hazard area and its hazard level. The calculation of the formula parameters involved in the method is clear, has good universality, is easy to program and has strong practicability, and can approximate real-time warning of mine rockburst hazards in a large range.

Description

technical field [0001] The invention relates to the field of mine rock burst risk monitoring, in particular to a rock burst early warning method based on dynamic and static load disturbance superposition. Background technique [0002] The occurrence of rock burst is related to the physical and mechanical properties of coal rock, the static load and dynamic load on coal rock, etc. When the superposition of static load and dynamic load of coal rock mass exceeds the critical load of coal rock impact damage, it will induce Large energy mine earthquake or rock burst. According to long-term theoretical studies and field tests, mining factors such as rock burst faults, folds and other geological structures, coal pillars in unreasonable sections, coal pillars left in protective layers, nearby mining activities, and square working faces will cause local stresses in surrounding rocks. Concentration, microseismic events will also appear concentrated in the above areas, bringing dynami...

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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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