A method of reducing load and prying to prevent rockburst in coal seam group with large dip angle

Abstract

The invention discloses a method for reducing load and prying to prevent and control rockburst of a coal seam group with a large dip angle. The three-dimensional numerical model is used to calculate the static load stress, simulate the distribution of mining stress during the mining of coal seam groups, and determine the location of the peak mining stress; according to the monitoring results of the spatial distribution of microseismic events and the simulation results of mining stress distribution, determine the pressure of the coal seam group with a large dip angle. Pry stress concentration area; arrange blast holes in the pressure pry stress concentration area; charge and detonate the blast holes to realize pressure relief in the stress concentration area. The present invention can accurately judge the stress concentration area in the mining process of large-inclination coal seam groups, perform effective pressure relief in a timely and precise manner, reduce the risk of rock burst and the cost of rock burst prevention, and is suitable for mining large-inclination coal seam groups.

Description

technical field [0001] The invention relates to the technical field of rockburst disaster prevention and control, in particular to a method for preventing and controlling rockburst of a coal seam group with a large dip angle by reducing load and prying. Background technique [0002] As one of the main coal-rock dynamic disasters in coal mines, rock burst is very destructive, often causing damage to tunnel equipment and casualties. With the reduction of horizontal and gently inclined coal seam reserves in the east and the deepening of mining depth, the government began to approve the mining of large dip angle coal seams with complex coal and rock occurrence conditions in the west. Due to the special coal-rock occurrence conditions, the rockburst in the steep-angle coal seam begins to appear in the shallow part, and its appearance characteristics are significantly different from those of the gently inclined coal seam, especially during the mining process of the coal seam group...

AI Technical Summary

Problems solved by technology

Due to the special overlying rock structure in large-dipping coal seams, the blasting pressure relief method proposed by the predecessors for horizontal and gently inclined coal seams often results in waste of manpower and material resources, the effect of pressure relief is not obvious, and rock bursts still occur frequently

At the same time, the blasting holes in the existing blasting pressure relief method for some inclined coal seams are only drilled obliquely along the surrounding rock of the roadway, and each hole has the same depth, resulting in some holes being relatively shallow in the stress concentration area, and the pressure relief effect is not obvious , some holes are too deep, resulting in high cost

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