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Directional joint-cutting and fracturing roof main roadway scour-preventing and roadway-protecting method and safe mining method

A technology of fracturing and cutting, which is applied to ground mining, mining equipment, mining equipment, etc., and can solve the problem of insufficient consideration of the dual needs of roadway protection and anti-scouring, the large amount of engineering work for roadway maintenance, and the small range of pressure relief protection belts. To achieve the effects of controlling high-energy vibration and impact risk, creating economic benefits, and solving the limited cracking range

Active Publication Date: 2022-03-29
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a method of directional slit fracturing and fracturing roof roadway protection against erosion and a safe mining method to solve the problem that the existing methods do not fully consider the dual needs of roadway protection and erosion prevention, and most of them belong to One or more of the problems of passive pressure relief and danger relief, small range of pressure relief protection zone, large roadway maintenance, sometimes need to be repeated many times, great impact on production, and high comprehensive cost

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  • Directional joint-cutting and fracturing roof main roadway scour-preventing and roadway-protecting method and safe mining method
  • Directional joint-cutting and fracturing roof main roadway scour-preventing and roadway-protecting method and safe mining method
  • Directional joint-cutting and fracturing roof main roadway scour-preventing and roadway-protecting method and safe mining method

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Embodiment 1

[0075] A specific embodiment of the present invention discloses a roadway protection method for directional slit fracturing of the roof. Starting from the conditions and main controlling factors of deformation and failure of the roadway affected by mining and rock burst, it is proposed to adopt The technical method of roof directional fracture fracturing blocks the transmission path of mining stress, improves the surrounding rock stress state of the roadway, and forms double-layer fracturing cracks around the roadway (facing the mining side) through the cooperation of long and short fracturing holes , to achieve the purpose of pressure relief roadway protection. First determine the scope of fracturing protection, and then determine the fracturing timing. On the basis of analyzing the rock formation structure in the fracturing area, determine the key parameters such as fracturing horizon, fracturing hole depth, and fracturing angle; on this basis, design the long-term , short f...

Embodiment 2

[0166] Yet another specific embodiment of the present invention discloses a safe mining method capable of realizing safe mining in coal mines, comprising the following steps:

[0167] Step S1: Design the reserved width of the uphill anti-scouring coal pillar in the fully mining area on both sides;

[0168] Step S2: Carry out excavation according to the designed reserved width of the anti-scouring coal pillar, and perform directional fracturing and fracturing of the roof according to the method of directional fracturing and fracturing roof roadway anti-erosion protection in Embodiment 1 after mining.

[0169] Specifically, the reserved width of anti-scouring coal pillars in the mining area on both sides is designed in the mining area / belt area design stage; the mining area / belt area main road / uphill Excavation; After the layout of the mining area / belt area is completed, the equipment installation is completed on the working face in the mining area / belt area, and in the process ...

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Abstract

The invention relates to a directional kerf fracturing roof main roadway scour prevention and roadway protection method and a safe mining method.The scour prevention and roadway protection method comprises the steps that firstly, the main roadway fracturing range and the rock layer position to be fractured are determined; 2, the construction elevation angle and the construction length of the fracturing drill hole are determined; roof fracturing drill holes are constructed within the main roadway fracturing range, and the fracturing drill holes comprise first fracturing holes and second fracturing holes; and thirdly, directional slotting and high-pressure hydraulic fracturing are conducted on the first fracturing hole and the second fracturing hole. The safe mining method adopts a directional joint-cutting and fracturing roof main roadway scour-preventing and roadway-protecting method. The arrangement mode that the long fracturing holes and the short fracturing holes are combined is adopted, directional fracturing is conducted on the surrounding rock of the main roadway top plate, a double-layer protection belt is formed on the periphery of the main roadway, the influence of top plate movement and mining-induced bearing pressure on the main roadway is effectively blocked, the main roadway impact hazard source is fundamentally eliminated, and the dual purposes of impact prevention and roadway protection are achieved.

Description

technical field [0001] The application belongs to the technical field of rock burst prevention and roadway protection in coal mine roadways, and in particular relates to a roadway prevention and protection method and a safe mining method for directional slit fracturing roof roadway. Background technique [0002] Rockburst refers to the dynamic phenomenon of sudden and violent destruction of the coal body around the coal mine shaft or working face due to the instantaneous release of elastic deformation energy. It is one of the main factors restricting the safe mining of deep coal resources in my country. With the deterioration of the geological conditions of coal mines and the intensification of stress concentration, more and more coal mines have encountered problems such as the contradiction between mining at the working face and the maintenance of roadway development, and the development of roadways is affected by vibrations and even rock bursts appear. The anti-scour requi...

Claims

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Application Information

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IPC IPC(8): E21D9/10E21C41/18E21F17/00
CPCE21D9/10E21C41/18E21F17/00Y02A10/23
Inventor 贺虎岳晓明窦林名巩思园牟宗龙蔡武李祺隆沈礼明
Owner CHINA UNIV OF MINING & TECH
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