A pressure relief method for coal mine rock burst prevention and control of hydraulic cracking and cut-off roof

Abstract

The invention provides a hydraulic cracking cut-off roof pressure relief method for prevention and control of rock burst in coal mines, and relates to the technical field of prevention and control of rock burst in coal mines. The method of the present invention comprises the following steps: step 1, determine the location of the target fault top rock layer and the thickness of the fault top; step 2, determine the construction parameters of the hydraulic splitting hole; step 3, the construction layout of the hydraulic splitting; step 4, the target fracture of the hydraulic splitting Top rock layer; step 5, cracking effect detection. The method for preventing and controlling hydraulic cracking in coal mine rock burst according to the present invention is applied to rock burst mines. The pressure relief of broken roof is safe and efficient, the construction operation is convenient, the expander can be used repeatedly, and the cost is greatly reduced; the goal of the roof is realized. Precise pre-cracking of the required fault top rock strata and fully connected caving under the action of overlying rock movement and mine pressure can reduce the damage of dynamic loads and avoid the safety defects and construction defects of explosive blasting top cutting. High application and promotion value.

Description

technical field [0001] The invention relates to the technical field of prevention and control of rock burst in coal mines, in particular to a pressure relief method for hydraulic cracking cut-off tops for prevention and control of rock bursts in coal mines. Background technique [0002] In recent years, many rockburst accidents have occurred in the Juye mining area in Southwest Shandong, causing serious economic losses and casualties. When rock burst occurs, it often shows the characteristics of large impact energy, wide damage range, and low predictability. At present, pressure relief by rock burst is mainly used for intervention. In addition to coal seam pressure relief, coal seam roof breaking pressure relief has gradually become the main pressure relief method. At present, the pressure relief of broken roofs is mainly achieved by explosive blasting roof cutting technology. The key to explosive blasting roof cutting technology is to fully connect the blasting cracks in t...

AI Technical Summary

Problems solved by technology

The application practice in underground coal mines shows that the existing explosive blasting roof cutting technology mainly has the following defects and disadvantages: First, to realize the successful cutting of the roof target rock strata, it is necessary to load a large amount of explosives and repeatedly verify the charge coupling and the blasting roof cutting effect. , Sealing and other processes are time-consuming and labor-intensive; second, it is generally impossible to visually peek at the development of cracks and evaluate the blasting effect after blasting due to hole sealing. If there is a broken shot or blast rejection, it is inconvenient to deal with it, which threatens the life safety of production and construction personnel; In addition, explosives and other pyrotechnics are currently controlled by the state, and their approval and use have strict requirements, and our country also explicitly prohibits or restricts their application in goafs of high-gas mines

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