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Method for inverting fracture position of end top plate of gob-side entry retaining

A technology of retaining entry and roof, which is applied in the direction of earthwork drilling, mining equipment, mining equipment, etc., and can solve the problems of difficult detection and control of timing and position

Pending Publication Date: 2022-08-05
CCTEG COAL MINING RES INST +1
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Problems solved by technology

[0005] The invention provides a method for reversing the fracture position of the top plate of gob-side entry retention, which is used to solve the defect that the timing and position of the "O-X" type fracture are difficult to detect and grasp in the prior art

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  • Method for inverting fracture position of end top plate of gob-side entry retaining
  • Method for inverting fracture position of end top plate of gob-side entry retaining
  • Method for inverting fracture position of end top plate of gob-side entry retaining

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Embodiment Construction

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Combine below Figure 3-Figure 5 Describe a method of the present invention for inverting the fracture position of the roof at the end of a gob-side entry retaining. The method for inverting the fracture position of the roof at the end of the gob-side entry retaining includes using three kinds of monitoring data to invert the breaking law of the roof at the end, which specifically includes:

[0032] First,...

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Abstract

The invention relates to the technical field of coal mining, and provides a method for inverting a fracture position of a top plate of a gob-side entry retaining end head. The method comprises the following steps: drilling holes in a coal body of a working face, mounting anchoring parts on top plates at different layers, and monitoring the displacement change of deep base points of the anchoring parts to obtain first change data; measuring the change of a stressometer in a goaf behind the bracket to obtain second change data so as to monitor a fracture position along the trend and tendency of the working face; monitoring stress changes at a plurality of positions with different distances from the coal pillar side to the roadway to obtain third change data; and inverting the fracture law of the end top plate through the first change data, the second change data and the third change data. According to the invention, the fracture rule of the end top plate is inversed according to the change of the three kinds of data obtained through monitoring; according to the method, a judgment mode of fracture of the two sides of the top plate of the end head is provided, and graded fracture of the top plate can be monitored by monitoring the stress change of the goaf.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for inverting the fracture position of the roof at the end of a gob-side entry retaining. Background technique [0002] like figure 1 and figure 2 As shown in the figure, after the working face is mined, the roof breaks in an "O-X" type, forming three key blocks A, B, and C (hereinafter referred to as block A, block B and block C), and the end roof mainly refers to block B , the timing and location of block B breaking have little effect on traditional roadways, but for gob-side retaining roadways, it greatly affects the choice of the strength of the roadside filling and the pressure relief method. probe. [0003] The structure of the top plate cannot be directly probed. Some scholars have theoretically calculated the breaking span, and believe that the span is close to the top plate period to press the step distance. Some scholars conduct drilling peeping throu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/18E21F17/00
CPCE21F17/18E21F17/00
Inventor 刘跃东王东攀张辉刘超儒
Owner CCTEG COAL MINING RES INST
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