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Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method

A technology of crushing surrounding rock and grouting reinforcement, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of grouting leakage and poor reinforcement effect, so as to improve the bearing capacity, ensure safe use, and improve the surrounding area. The effect of rock integrity

Pending Publication Date: 2021-12-17
SHANXI JINMEI GRP TECH RESEACH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of serious grouting leakage and poor reinforcement effect of coal pillar grouting in gob-side excavation of small coal pillars, the present invention proposes a grouting reinforcement method for broken surrounding rock in gob-side excavation of small coal pillars

Method used

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  • Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method
  • Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method
  • Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method

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Embodiment Construction

[0022] The present invention will be further described in conjunction with the accompanying drawings.

[0023] As shown in the figure, a small coal pillar gob-side roadway broken surrounding rock grouting reinforcement method, the steps are as follows:

[0024] On the side of the small coal pillar, according to the width of the small coal pillar, the drilling construction is first carried out, and the deep grouting drilling is carried out according to the parameters such as the height of the drilling hole, the row spacing and the diameter, and the hole depth is 1.5m smaller than the width of the coal pillar; Then construct a shallow grouting hole between the two deep grouting holes, and the depth of the shallow grouting hole is 2m shorter than that of the deep hole. After the drilling construction is completed, the intubation and hole sealing construction is carried out. The grouting steel pipe is inserted into the grouting hole, and then the hole is sealed. The length of the ...

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Abstract

The invention discloses a small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method, belongs to the technical field of coal mine construction, and can solve the problems that small coal pillar gob-side entry driving coal pillar grouting leakage is serious, and the reinforcement effect is poor.By combining deep and shallow holes, a free opening gap of a small coal pillar is blocked, the strength of a surrounding rock in a middle core bearing region of the small coal pillar is reinforced, and the bearing capacity of the small coal pillar is improved, so that the deformation of gob-side entry driving surrounding rock of the reserved small coal pillar is controlled, and safe use of the roadway is ensured.

Description

technical field [0001] The invention belongs to the technical field of coal mine construction, and in particular relates to a technical method for reinforcing the surrounding rock of the small coal pillar when the surrounding rock on the side of the coal pillar is broken in gob-side excavation of the small coal pillar. Background technique [0002] Gob-side entry of small coal pillars is an important technical method to improve the recovery rate of coal resources, extend the service life of mines, and is an important technical method for green mining of mines. Due to the mining stress of the previous working face, the surrounding rock of the side coal body was broken, and the small coal pillar was left in the stress reduction zone along the goaf. Large deformation and instability. Strengthening the support strength and improving the surrounding rock structure are commonly used technologies for controlling the surrounding rock of small coal pillars. However, due to the large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21B33/13
CPCE21D11/10E21B33/13
Inventor 张江利马赛陶广美王萌赵斌陈志强贾航王朋卫丛日东马晋琴原小路
Owner SHANXI JINMEI GRP TECH RESEACH INST
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