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Support method for coal seam roadway to cross gob

A technology of over-goaf and goaf, applied in coating, tunnel, tunnel lining, etc., can solve the problem of not meeting the stability requirements of surrounding rock

Active Publication Date: 2012-06-20
SCI & TECH RES OF SHANXICOAL TRANSPORTATION & SALES GROUP
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  • Abstract
  • Description
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Problems solved by technology

In view of the impact of the caving zone, crack zone and overall bending zone of the overlying strata in the goaf on the stability of the surrounding rock in the goaf, when the deformation and displacement of the surrounding rock in the goaf are serious and the dynamic pressure is concentrated, the above support methods cannot meet the requirements of the coal seam. Surrounding rock stability requirements for roadway passing through goaf

Method used

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  • Support method for coal seam roadway to cross gob
  • Support method for coal seam roadway to cross gob

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Embodiment approach 1

[0018] The support method for the coal seam roadway passing through the goaf under the action of the alternating current electric field of the present invention supports the well bottom depot passing through the gob. The support process is:

[0019] I, first to a certain mine 15 # The regenerated surrounding rock in the goaf beyond the outline of the coal seam bottom depot is temporarily supported, and the small guide pipe is driven in advance according to the outer insertion angle of 15° and the circumferential spacing of 600mm, and the length of the small guide pipe is 1600mm;

[0020] II. Build an AC electric field grouting system. The main components of the system include the regenerated surrounding rock in the goaf, the bottom hole parking lot, a small conduit, cement slurry and an AC electric field;

[0021] III. Inject cement slurry into the small conduit, apply an AC electric field, the voltage is 660V, and the admixture is an acidic electrolyte Na 2 SiO 3 , the con...

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Abstract

A support method for a coal seam roadway to cross a gob belongs to the technical field of roadway supporting for coal measure strata and utilizes combination of temporary support and permanent support. The support method is characterized in that the temporary support includes applying an alternating-current field after double-slurry is grouted into small ducts, increasing scattering radius of the slurry under electric effect of electro-osmosis and electrophoresis, filling the double-slurry into holes and slits inside regenerated surrounding rock of the gob sufficiently so as to reinforce of the regenerated surrounding rock of the gob again, and finally forming the integrated surrounding rock. The support method aims to increase integral strength, stability and self-bearing capacity of the regenerated surrounding rock of the gob. The integral strength of the regenerated surrounding rock of the gob is increased by at least 230% by using the support method as compared with the existing support method for the coal seam roadway to cross the gob.

Description

technical field [0001] The invention relates to a support method for a coal seam roadway passing through a goaf, which belongs to the technical category of coal measure stratum roadway support, and specifically relates to a temporary support and permanent support for a coal seam roadway passing through a goaf under the action of an external alternating current electric field. The purpose of the support method is to improve the overall strength, stability and self-bearing capacity of the regenerated surrounding rock in the goaf. Background technique [0002] With the increasing demand for coal in the national economy, the output of coal is increasing year by year, and the intensity of coal mining is increasing. When coal resources are integrated, a merged and reorganized mine is often composed of several small coal kilns. When mining coal resources, these small kilns are due to insufficient mining, improper selection of mining methods, untimely treatment of mined areas, and d...

Claims

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Application Information

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IPC IPC(8): E21D19/00E21D11/10C25D13/02
Inventor 于喜东李风珍王东贾存华陈军胜孙春伟郑铜镖韩浩孔金龙
Owner SCI & TECH RES OF SHANXICOAL TRANSPORTATION & SALES GROUP
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