Method for actively controlling motion of coal mine critical layers by using strip filling walls

Abstract

The invention relates to a coal mine rock burst pre-controlling method, particularly to a method for actively controlling motion of coal mine critical layers by using strip filling walls. The method comprises the steps of calculating initial fracture steps of the coal mine critical layers by using a mine pressure theoretical model, determining intervals of the strip filling walls through combining experience safety factors, and calculating widths of the filling walls according to coal bed buried depths, rock stratum volume weights and unidirectional compressive strength of filling materials, and performing construction of the strip filling walls. According to the method, danger relieving measures passively adapted to abrupt fractures of critical layers in the prior art are changed into the measure of eliminating preconditions of fracture of coal mine critical layers in advance, so that pre-defense for coal mine rock burst is achieved. According to the method, the coal mining production efficiency can be improved, the work amount of filling construction of coal mine working faces is reduced, filling materials are saved, and the production cost per unit of coal is reduced.

Description

technical field [0001] The invention relates to a method for pre-controlling rock burst in coal mines, in particular to a method for actively controlling the movement of key layers in coal mines by using strip filling walls. Background technique [0002] Coal mine rock burst is a catastrophic dynamic phenomenon in which the coal or rock mass suddenly protrudes during the excavation and mining process, causing casualties, roadway, equipment damage, and even ground vibration. [0003] The control of rock burst in coal mines is still an international problem. Every year, thousands of meters of tunnels are damaged by rock burst, causing many casualties and causing direct economic losses of billions of yuan, affecting nearly 10 billion tons of deep coal resources. safe mining. Therefore, the rock burst pre-control technology has important scientific value for overcoming the international problem of rock burst prevention and control. [0004] The mining rockburst refers to the r...

AI Technical Summary

Problems solved by technology

[0005] 1. By inducing the simultaneous release of the compressive elastic energy of the coal seam at the peak position of the bearing pressure, it leads to the destruction of the surrounding rock of the working face and the advanced roadway;

[0006] 2. Instantaneous high-speed subsidence when the roof is broken, and damage caused by impacting and squeezing the coal wall

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