A method for controlling dynamic stress in counter-mining and excavation of short-distance coal seams

A technology of mining stress and control method, which is applied in surface mining, mining equipment, underground mining, etc., can solve the problems of easy-to-drop anchor failure, tearing, and failure to protect the watch.

Inactive Publication Date: 2020-02-21
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] ①The deformation of the roadway is large and the surrounding rock is broken, resulting in poor anchoring effect and easy anchor failure. ②The metal mesh is easy to form a "net pocket" or even torn, which cannot achieve a good surface protection effect at all. ③Traditional shed support Under the action of strong dynamic pressure, the deformation is serious, or even broken. ④The repair rate of the roadway is high, the maintenance time is short, and the waste of materials is caused by repeated repairs, and the support cost is high. The study only involves the counter-mining and excavation of the coal seam, and does not involve the maintenance of the roadway maintenance of the adjacent coal seam. Roadway Surrounding Rock Stability and Sectional Control Technology Research" and other related literatures only have the research on the surrounding rock control of the coal seam counter-excavation roadway, and there is no research on the surrounding rock control of the adjacent coal seam counter-excavation roadway.

Method used

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  • A method for controlling dynamic stress in counter-mining and excavation of short-distance coal seams
  • A method for controlling dynamic stress in counter-mining and excavation of short-distance coal seams
  • A method for controlling dynamic stress in counter-mining and excavation of short-distance coal seams

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 and Figure 4 As shown, the mining stress control method of this coal seam is: when the driving face 6 of the mining roadway in this coal seam meets the adjacent working face 7, that is, when the distance 5 between the working face and the driving face is 0m, the tunneling is stopped at this time. Continue the roadway excavation after the working face is 100m away from the excavation surface, and the support is carried out synchronously with the roadway excavation. The specific support measures are: use the anchor rod 1 and the anchor cable 3 to cooperate with the steel wire mesh 4 for support, and the steel wire mesh 4 covers the roof of the roadway With the two gangs, it is used to strengthen the support and prevent the two gangs of coal walls; the support is carried out synchronously with the roadway excavation, the anchor rod 1 is a twist-type resin anchor rod, Φ20×2000mm, and the distance between the anchor rods is L 1 The row spacing is 900mm, 5 ...

Embodiment 2

[0030] Such as figure 2 and Figure 5 As shown, the mining stress control method when adjacent coal seams are excavated and excavated: when adjacent coal seams are overlapped or staggered (the stagger distance is less than 10m) when mining; For the mining roadway of the coal seam working face, continue to excavate after the lower coal seam working face 9 is 70m away from the upper coal seam mining roadway excavation face 10, and the support is carried out synchronously with the roadway excavation. The specific support measures are: use the anchor rod 1 and the anchor cable 3 The steel wire mesh 4 is used for support, wherein the steel wire mesh 4 covers the roof and two sides of the roadway to strengthen the support and prevent the two sides of the coal wall; the support is carried out synchronously with the roadway excavation, and the bolt 1 is a twisted resin bolt , Φ20×2000mm, bolt 1 spacing L 2 The row spacing is 900mm, 5 in each row, the three in the middle are driven ...

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Abstract

The invention discloses a method for controlling roadway surrounding rock deformation under the condition of opposite stoping and tunnelling of close-range coal seams, and the method is used for the field of mining-induced stress control methods for opposite stoping and tunnelling of the close-range coal seams. The mining-induced stress control methods corresponding to three types of conditions include: the mining-induced stress control method for opposite stoping and tunnelling of the corresponding coal seam, the mining-induced stress control method for lower stoping and upper tunnelling of the adjacent coal seam, and the mining-induced stress control method for upper stoping and lower tunnelling of the adjacent coal seam. The technical problems of roadway large deformation, low roadway support efficiency and high support cost under the influences of stoping are effectively solved; and it can be seen that the roadway large deformation phenomenon is reduced by 70%, the support efficiency is improved by 20%, and compared with the prior art, the support cost is lowered to 60%.

Description

technical field [0001] The invention relates to a mining dynamic stress control method, and is especially suitable for a short-distance coal seam counter-mining dynamic stress control method used in the field of short-distance coal seam counter-mining dynamic stress control methods. Background technique [0002] In the process of underground mining, it is very common for the phenomenon of counter-mining and excavation between the working face and the roadway. Under normal conditions, the mining of the working face will only have a certain impact on the adjacent working face. Under certain conditions, due to the small interlayer spacing of the coal seam, the mining of the working face will also affect the excavation of the adjacent coal seam. Due to the impact of mining stress, the excavation and maintenance of the roadway have been greatly affected, especially in the space Before and after the superposition, the mining stress and the disturbance stress of the excavation surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21D20/00E21D20/02E21D11/15
CPCE21C41/18E21D11/152E21D20/00E21D20/025
Inventor 张强张吉雄吕目晓陈杨慈忠贞孟凡林武中亚张琪
Owner CHINA UNIV OF MINING & TECH
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