Method and device for optimizing mining stopping line position with hydrofracture pressure relieving

Abstract

The invention relates to the technical field of coal mining, in particular to a method and device for optimizing a mining stopping line position with hydrofracture pressure relieving. The method for optimizing the mining stopping line position with hydrofracture pressure relieving comprises the following steps that the geological state of a working face is obtained, and structural data of a roof rock layer is determined; according to the structural data, holes are obliquely drilled towards a roof from a mining roadway and are drilled at a preset distance in the length direction of the mining roadway, and thus a plurality of hydrofracture pressure relieving holes arranged in sequence are obtained; hydrofracture pressure relieving treatment is carried out on multiple preset positions of each hydrofracture pressure relieving hole to form multiple cutting cracks; the roof rock layer is cut off along the cutting cracks of all the hydrofracture pressure relieving holes. By means of the method and the device, the influence of the advanced supporting pressure of the working face to the mining roadway can be effectively reduced, transferring of the prestress of the roof and weakening of surrounding rock can be achieved, the purpose of reducing and optimizing the mining stopping line position of the working face can be achieved, and the recycling rate of coal resources can be increased.

Description

technical field [0001] The invention relates to the technical field of coal collection, in particular to a method and a device for optimizing the position of a stop production line by using hydraulic fracturing to relieve pressure. Background technique [0002] my country's coal mines are dominated by underground mining, and a large number of roadways need to be excavated underground. Keeping the roadways smooth and the surrounding rock stable is of great significance to the safe production of coal mines. The roadway in the mining area is the roadway that serves the entire mining area, and generally serves multiple coal mining faces at the same time. During the mining process of coal mining face, high advanced support pressure and lateral support pressure will be generated. Due to geological conditions, roadway layout, production system and other reasons in the coal mining face, it is impossible to mine coal indefinitely forward. A production stop line will be artificially ...

AI Technical Summary

Problems solved by technology

The unreasonable position of the stop production line will cause two consequences. One is that the distance is too small, and the advanced support pressure of the coal mining face will have a greater impact on the roadway in the mining area, resulting in damage to the roadway in the mining area; the other is that the distance is too large, resulting in coal resources loss

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