Hydraulic fracturing roof-cutting pressure relief method for coal mine rock burst prevention and control

Abstract

The invention provides a hydraulic fracturing roof-cutting pressure relief method for coal mine rock burst prevention and control, and relates to the technical field of coal mine rock burst prevention and control. The method comprises the following steps that 1, the position and the roof-cutting thickness of a target roof-cutting rock stratum are determined; 2, hydraulic fracturing hole construction parameters are determined; 3, hydraulic fracturing construction arrangement is conducted; 4, hydraulic fracturing is conducted on the target roof-cutting rock stratum; and 5, the fracturing effect is detected. The hydraulic fracturing roof-cutting pressure relief method for coal mine rock burst prevention and control is applied to a rock burst mine, roof-cutting pressure relief is safe and efficient, construction operation is convenient and fast, an expansion device and the like can be repeatedly used, and the cost is greatly reduced; and accurate pre-fracturing of the roof-cutting rock stratum needed by a roof target is achieved, full communication and caving are achieved under the action of overlying strata movement mine pressure, the dynamic load damage effect is reduced, the safety defects and the construction defects of explosive blasting roof cutting are avoided, and extremely high application and popularization value is achieved in coal mine rock burst prevention and control engineering practice.

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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