A method of directional slit fracturing roof roadway anti-scouring and roadway protection and safe mining method
A technology of fracturing and cutting, which is applied in ground mining, mining equipment, underground mining, etc. It can solve the problem of not fully considering 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: 2022-05-31
CHINA UNIV OF MINING & TECH
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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
Method used
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Embodiment 1
[0080]
[0084] L
[0086] K
[0089] The second method: Because the direct roof 12, the old roof 11, and the roof 10 are developed sequentially above the coal seam, as shown in Figures 4 to 5. according to
[0090]
[0091] The rock formation that meets the above formula is determined to be the old top 11 rock formation entering the fissure zone; in the formula:
[0092] H
[0093] H'
[0095] K
[0096] H
[0097] K
[0103]
[0106] r: cracking crack propagation radius, referred to as cracking radius, m;
[0108]h: the vertical distance of the fractured horizon from the fractured orifice, m.
[0109] Wherein, the crack-causing crack propagation radius r is determined based on the way of on-site crack-causing construction or experimental testing. Exemplary
[0113] The numbering starts from the boundary of the fracturing area, as shown in FIG. 3 , the fracturing boreholes are sequentially recorded as 1#, 2#, …
[0115] 0.5r≤D≤r;
[0116] Preferably, the distance D between two ad...
Embodiment 2
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The present application relates to a method of directional fracturing and fracturing roof roadway protection against scour and a safe mining method, wherein the method of roadway protection against scour includes: Step 1: determining the cracking range of the roadway and the rock strata to be cracked Step 2: Determine the construction elevation angle and construction length of the fracturing drilling; construct the roof fracturing drilling within the fracturing range of the main road, and the fracturing drilling includes the first fracturing hole and the second fracturing hole; Step 3: Directional slotting and high-pressure hydraulic fracturing are carried out in the first fracturing hole and the second fracturing hole. The safe mining method adopts the method of anti-scouring and roadway protection of roadway with directional slit fracturing roof. This application adopts the combination of long and short fracturing holes to conduct directional fracturing on the surrounding rock of the roof of the road, and forms a double-layer protective belt around the road to effectively block the influence of roof movement and mining support pressure on the road. Fundamentally eliminate the impact hazards of the main road, and achieve the dual purpose of anti-scour and road protection.
Description
A kind of directional slit fracturing roof roadway anti-scour roadway protection method and safe mining method technical field The application belongs to coal mine roadway rockburst prevention and control and roadway protection technical field, specifically relate to a kind of directional Slotted fracturing roof roadway anti-scour roadway protection method and safe mining method. Background technique Rockburst refers to the sudden release of elastic deformation energy of coal mass around coal mine roadway or working face. The dynamic phenomenon of sudden and violent destruction is one of the main factors restricting the safe mining of deep coal resources in my country. with coal mines The deterioration of geological conditions and the intensification of stress concentration, more and more coal mines have encountered problems of working face mining and roadway maintenance. Contradictions, the problem of the development of the main road being damaged by vibration and ...
Claims
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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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