Novel coal mine rock burst treatment method

Abstract

The invention provides a novel coal mine rock burst treatment method which is suitable for being used in a mine. After a working face roof is stable after goaf, a new working face gate roadway is tunneled along a goaf, small coal pillars are reserved, construction drilling is conducted on the boundary area of the adjacent goaf through advancing gate roadway tunneling till the goaf is reached, andconcrete grout is poured into drilled holes to fill the boundary gap of the goaf; and the small coal pillars are reserved to tunnel the gate roadway along the goaf, drilling is conducted on the roadway surrounding rock separation layer fracture area through lagging tunneling, surrounding rock is reinforced through drilling grouting, construction is repeated till construction of the whole gate roadway is completed, the concrete grout forms a filling slope-filling concrete wall along the goaf, then another gate roadway and a cutting hole of a new working face are arranged to conduct mining on the new fully mechanized coal mining face, and after stoping is completed, the steps are repeated to achieve mining of the small coal pillars reserved between the working faces of the whole goaf. According to the novel coal mine rock burst treatment method, stress concentration can be eliminated, generation of rock burst is avoided, the goaf is effectively isolated, deformation and damage of the small coal pillars are significantly reduced, spontaneous combustion of residual coal of the small coal pillars and the goaf is eradicated, and the resource recovery rate is increased.

Description

technical field [0001] The invention relates to a method for controlling rock burst, especially for use in modern mines with comprehensive mechanized coal mining, and provides a novel method for controlling rock burst in coal mines that improves the resource recovery rate. Background technique [0002] In order to ensure the safety and high efficiency of coal mine mining, an isolated coal pillar with a width of 20-40m is left between the working faces of most mines. It also ensures the safety and efficiency of all production systems and channels that make up the production face. [0003] At present, there are mainly two technologies for coal pillarless mining, that is, gob-side entry retention and gob-side entry entry technology. It is common for countries such as Russia, Germany, and Poland to implement longwall mining methods without coal pillars, and most of them are gob-side entry retention. However, when this technology is implemented in my country, it encounters diffi...

AI Technical Summary

Problems solved by technology

① When the coal pillar is connected to the mining face, if the small coal pillar adjacent to the gob is too narrow, it will be deformed and unstable due to the influence of the support force; Support is difficult, and the risk of rock burst is high; ②There is a large amount of broken coal left in the goaf and there is a threat of spontaneous combustion. As far as the country is concerned, more than half of the coal seams are prone to spontaneous combustion. As far as the Ordos area is concerned, almost all mined coal seams are prone to spontaneous combustion. The mine has already been hidden from this hidden danger ③The cracks produced by the small coal pillars due to compression deformation communicate with the goaf and form a water guide channel. Mine with a lot of water in the goaf can easily cause the working face to be flooded

[0012] To sum up, mining with wide coal pillars has problems such as rock burst, spontaneous combustion of residual coal in gobs, and waste of resources. ", the stress concentration caused by the "shoulder pole effect" structure behind the surface can not only solve the problem of rock burst, but also improve the resource recovery rate

[0013] However, the existing coal pillarless mining technology needs to take into account the construction of the next working face at the same time during the mining process of the previous working face, and there is no effective technology for the goaf that has been formed.

If small coal pillars are left, it is obvious that small coal pillars will be deformed and severely damaged by mine pressure, which may easily cause coal spontaneous combustion in spontaneous combustion coal seams, and cannot effectively prevent and control major hidden dangers such as water inrush caused by water accumulation in adjacent goafs

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