Support method for coal seam roadway to cross gob

A technology for going through goafs and goafs, which is applied in coatings, tunnels, tunnel linings, etc., and can solve problems such as failure to meet the stability requirements of surrounding rocks

Active Publication Date: 2013-10-30
SCI & TECH RES OF SHANXICOAL TRANSPORTATION & SALES GROUP
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  • Claims
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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

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Embodiment approach 1

[0018] The method for supporting a coal seam roadway passing through a goaf under the action of an AC electric field of the present invention supports the parking lot at the bottom of the mine passing through the goaf. The support process is:

[0019] I, first to a certain mine 15 # The regenerated surrounding rock in the goaf outside the contour line of the coal seam bottom parking lot is temporarily supported, and the small conduit is driven in advance according to the extrapolation angle of 15° and the circumferential spacing of 600mm. The length of the small conduit is 1600mm;

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

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

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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 seam roadway support, and is specifically a method for temporarily supporting and permanently supporting a coal seam roadway passing through a goaf under the action of an external AC electric field. The purpose of the support method is to improve the overall strength, stability and self-bearing capacity of the recycled surrounding rock in the goaf. Background technique [0002] With the increasing demand for coal in the national economy, coal production has increased year by year, and the intensity of coal mining has continued to increase. 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 only mining but not filling, improper mining methods, untimely processing of gobs, and damage to security coal pillars....

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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