Stoping roadway gob-side entry retaining method suitable for liable-caving top plate

A technology for mining roadway and empty roadway retention, which is used in surface mining, earthwork drilling, underground mining, etc., can solve the problems of high cost, low supporting bearing capacity, long roof overhang, etc., and achieves high compressive strength and reduced The effect of roof load and material cost saving

Inactive Publication Date: 2017-11-17
NORTH CHINA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of small support bearing capacity, long roof overhang and high cost in the existing gob-side retaining technology, and provide a method that is simple, easy to operate, economical and fast, has a large support bearing capacity, and has a roof Method of retaining roadway along gob in mining roadway with short suspended roof suitable for easy-falling roof

Method used

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  • Stoping roadway gob-side entry retaining method suitable for liable-caving top plate

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specific Embodiment approach 1

[0018] Specific implementation mode 1: This implementation mode records a method for retaining roadways along the goaf of mining roadways that are suitable for roofs that are prone to caving, and the method includes the following steps:

[0019] Step 1: Hanging a metal mesh 8 on the side of the coal wall of the gob near the mining roadway 5 to prevent the gangue 3 from pouring into the remaining roadway;

[0020] Step 2: Set up a high-resistance roof cutting support 6 on the side of the coal wall of the goaf near the mining roadway 5 to cut off the outer roof 2 of the roadway;

[0021] Step 3: Cut off the outer roof 2 of the roadway through the high-resistance roof cutting bracket 6, and fill part of the goaf with falling gangue 3, forming a layer of barrier between the roadway and the goaf to isolate the goaf;

[0022] Step 4: After the falling roof 2 is stabilized, a layer of foaming agent 7 is sprayed on the metal mesh 8 close to the surface of the side of the gob to furthe...

specific Embodiment approach 2

[0023] Specific embodiment two: a method of retaining roadway along the goaf of the mining roadway that is suitable for the easy-to-cause roof as described in specific embodiment one. In step two, the high-resistance roof cutting support 6 should meet the requirements

[0024] F≥ql+F b ;

[0025] Among them, F-cutting resistance; ql-load above the roof; F b - Shear forces between rock blocks forming a masonry beam structure at the fractured old roof.

specific Embodiment approach 3

[0026] Specific embodiment three: a method of retaining roadway along the goaf of a mining roadway that is suitable for a roof that is prone to caving described in specific embodiment one, in step 4, the foaming agent 7 adopts materials with sealing, flame retardant and anti-oxidation functions, For example, polyurethane foaming agent for coal mines.

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Abstract

The invention provides a stoping roadway gob-side entry retaining method suitable for a liable-caving top plate, and belongs to the field of coal mine underground supporting. The stoping roadway gob-side entry retaining method suitable for the liable-caving top plate comprises the steps that 1, a metal net is hung at one side, close to a coal wall of a goaf, of a to-be-retained roadway, and caved gangues are prevented from inrushing in the retained roadway; 2, a high-resistance waste edge support is erected on one side, close to the coal wall of the goaf, of the to-be-retained road way , so that an outer side top plate of the roadway is cut to fall; 3, the outer side top plate of the roadway is cut to fall through the high-resistance waste edge support, parts of the goaf are filled with the caved gangues, a layer of barrier is formed between the roadway and the goaf, and the goaf is isolated; and 4, after the caved top plate is stable, the metal net close to the surface of a roadside of the goaf is sprayed with a layer of foaming agent, the goaf is further densely isolated, and air leaking is prevented. The stoping roadway gob-side entry retaining method suitable for the liable-caving top plate has the advantages that roadside filling supports are omitted, and material cost and transporting cost are saved significantly; and the high-resistance waste edge support is adopted for the roadway, the goal of roof cutting for the liable-caving top plate can be achieved effectively, and top plate load is reduced.

Description

technical field [0001] The invention belongs to the field of underground support in coal mines, and in particular relates to a method for retaining a roadway along the goaf of a mining roadway suitable for roofs that are prone to caving. Background technique [0002] Gobside entry retaining technology is an important roadway protection technology for coal pillar-free mining. It can increase the coal recovery rate, rationally develop coal resources, prolong the service life of the mine, alleviate the contradiction between mining and replacement, reduce the roadway excavation project, prevent It is beneficial to improve the technical and economic effects of mines and the safe production of mines by shortening the moving time and canceling the isolated working face. Therefore, gob-side entry retention has become an important research direction of underground coal mining technology. [0003] The traditional gob-side retaining technology adopts roadside support technology, inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 石建军许海涛吴润花高林生李昊郭均中
Owner NORTH CHINA INST OF SCI & TECH
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