The roof caving and tunnel protecting method

A technology for roadway and coal seam roof, applied in the field of surrounding rock stability of coal mine roadway, can solve the problems of increasing roadway deformation, limited control effect, restricting roadway passage and transportation function, etc., so as to improve coal mining rate and reduce coal pillar width. Effect

Inactive Publication Date: 2009-08-19
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Therefore, increasing the support strength has a very limited control effect on the stability of the roadway surrounding rock near the goaf
[0011] 3) Repair the damaged roadway and reinforce the surrounding rock with grouting (cement slurry or chemical slurry), which not only greatly increases the amount of roadway repair work and material consumption, but also seriously affects the succession of the working face and production. Work properly
[0012] 4) The method of drilling pressure relief or blasting pressure relief on the two sides of the roadway or the floor to release the stress of the surrounding rock of the roadway will seriously damage the integrity of the surrounding rock of the roadway and increase the deformation of the roadway
However, within a certain range of the c...

Method used

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  • The roof caving and tunnel protecting method
  • The roof caving and tunnel protecting method
  • The roof caving and tunnel protecting method

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Embodiment Construction

[0035] The present invention will be further explained below in conjunction with the accompanying drawings.

[0036] A method for controlling roof caving and roadway protection of the present invention includes the following:

[0037] The coal mining face coal wall 1, the working face transportation lane 2 and the working face return air lane 3 form the production system of the working face as shown in the figure. The control caving is implemented in the working face return air lane to protect adjacent work Surface transportation lane 4. Under this condition, the process of implementing controlled placement is as follows:

[0038] 1) In the return air tunnel 3, the coal wall of the advanced coal mining face is 3~5m, close to the coal pillar side coal wall 10 of the return airway, and inclined α=15~45° to the coal pillar side. Drilling spacing B=3~5m, and the drilling depth S is based on the minimum control height h f To determine, the minimum control height h f Is based on the bre...

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Abstract

The invention relates to a method for controlling caving and lane-guarding. The method is characterized in that in a working surface roadway, drilling, blasting or cracking are carried out on a roof of a coal seam of complete hard strata with large thickness of a hanging arch in a goaf; bursting or cutting off are carried out on a complete hard roof strata with large thickness to facilitate the hanging arch in the goaf to collapse at the back of a force piece; collapsed waste rock fills the goaf, supports superincumbent stratum in a fissure zone and releases high bearing stress passed into the coal body adjacent to the goaf from weight of the large-thickness complete hard strata of the hanging arch in the goaf and the superincumbent stratum in the fissure zone thereof, so that the bearing stress in the coal body adjacent to the goaf is reduced and laneways in the space are protected. The method of the invention fundamentally improves stability of surrounding rock of laneways adjacent to the goaf and increases coal mining rate of ends of thick coal seam caving coal working surface.

Description

Technical field [0001] The invention relates to the technical field of the stability of the surrounding rock of a coal mine roadway. Background technique [0002] When there is a large and complete hard rock layer in the roof of the mined coal seam at a certain height, the hard rock layer will not rise to the goaf after mining, causing high supporting stress in the coal near the goaf. The supporting stress greatly affects the stability of the roadway in the coal near the goaf. For example, the 15# coal seam in a certain coal field and the 3# coal seam in a certain coal field contain complete and hard limestone or sandstone with a thickness of more than ten meters or even tens of meters in a certain range. The roadways near the mined-out areas, especially the mining roadways reserved for adjacent working faces by isolating the coal pillars, will produce large deformations and damages, and even fall, which seriously affects the normal use of these roadways. Through observation and ...

Claims

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Application Information

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IPC IPC(8): E21F15/00E21D11/00
Inventor 康天合柴肇云李义宝高鲁李东勇杨永康王东
Owner TAIYUAN UNIV OF TECH
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