Design and evaluation method of self-forming roadway mining without coal pillars by roof cutting and pressure relief

A technology of roof cutting, pressure relief and evaluation method, which is applied in mining equipment, ground mining, earthwork drilling and mining, etc., can solve the problems of time-consuming and labor-consuming, frequent safety accidents, large roadway excavation volume, etc., and achieve low coal mining cost, The effect of saving coal resources and high efficiency

Active Publication Date: 2022-04-05
CHINA UNIV OF MINING & TECH (BEIJING)
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AI Technical Summary

Problems solved by technology

Coal is generally formed underground. At present, the traditional underground coal mining methods mainly include short-wall and long-wall mining methods. Among them, the long-wall mining method has been widely used at home and abroad because of its high productivity and good ventilation performance. The 121 construction method in the longwall mining method (that is, mining one working face, digging two roadways, leaving one coal pillar) is widely used in coal mining, but it can be found from actual implementation that it still has the following shortcomings: 1) The amount of roadway excavation is large, which invisibly leads to high production costs: it is often necessary to carry out a large number of roadway excavation projects during mining, and the excavation cost is high. At the same time, the roadway excavation process is mostly manual construction, which is time-consuming and labor-intensive
2) Serious waste of resources and frequent safety accidents: the left coal pillars cannot be recovered, and the waste of coal resources is serious. At the same time, it leads to the concentration of surrounding rock stress and frequent safety accidents
3) Irreversible damage to land resources: due to the support of the coal pillar, the fracture and collapse of the overlying strata above the goaf and the coal pillar are inconsistent, and the cracks will continue to expand to the surface, so uneven surface settlement is likely to occur problems such as damaging the environment, causing damage to a large amount of land resources

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  • Design and evaluation method of self-forming roadway mining without coal pillars by roof cutting and pressure relief
  • Design and evaluation method of self-forming roadway mining without coal pillars by roof cutting and pressure relief
  • Design and evaluation method of self-forming roadway mining without coal pillars by roof cutting and pressure relief

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Embodiment Construction

[0019] Such as Figure 1 to Figure 3 As shown, the mining design and evaluation method of roof cutting and pressure relief without coal pillar self-forming roadway of the present invention includes steps:

[0020] 1) In the process of using coal mining equipment to carry out coal mining operations along the length direction of the working face, excavate the roadway space at the predetermined position of the coal seam 9 at the same time;

[0021] 2) Use the detection-while-drilling device to partition the excavated roadway 1 according to the equivalent rock mass strength, and divide multiple surrounding rock areas;

[0022] 3) Determine the prestressed support parameters and roof cutting parameters of each surrounding rock area according to the results of surrounding rock division, that is, the equivalent rock mass strength of each surrounding rock area;

[0023] 4) According to the determined prestress support parameters, perform high prestress energy-absorbing support on the...

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Abstract

The invention discloses a mining design and evaluation method for roof-cutting, pressure-relief, and coal-pillar-free self-formed roadway, which includes: simultaneously digging out the roadway space during the coal mining operation; dividing the surrounding rock of the excavated roadway; determining the prestress of each surrounding rock area Support parameters and roof cutting parameters; high prestressed energy-absorbing support for the roof, and directional roof cutting for the goaf side of the roof at the same time; gangue-blocking support for the roadway; gangue-blocking side of the roadway is closed to form a reserved roadway; Carry out real-time monitoring of roadway stability evaluation indicators for the reserved roadway, and conduct real-time evaluation of the stability of the reserved roadway based on the self-contained roadway stability evaluation system; optimize the reserved roadway according to the stability evaluation results. The invention realizes synchronous formation of roadway in the process of coal recovery and mining at the working face, ensures the stability of the roadway, does not leave coal pillars, has low cost, high working efficiency, safety and reliability, and is suitable for popularization.

Description

technical field [0001] The invention relates to a mining design and evaluation method for roof-cutting, pressure-relief and coal-pillar-free self-forming roadway, and belongs to the technical field of coal mining. Background technique [0002] As we all know, coal accounts for more than 50% of the primary energy produced and consumed in my country for a long time, and is the main energy source in my country. Coal is generally formed underground. At present, the traditional underground coal mining methods mainly include short-wall and long-wall mining methods. Among them, the long-wall mining method has been widely used at home and abroad because of its high productivity and good ventilation performance. The 121 construction method in the longwall mining method (that is, mining one working face, digging two roadways, leaving one coal pillar) is widely used in coal mining, but it can be found from actual implementation that it still has the following shortcomings: 1) The larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21D9/14
CPCE21C41/18E21D9/14
Inventor 王琦王亚军何满潮杨军江贝秦乾高红科
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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