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Method of supporting along spatially keeping lane end

A support method and composite admixture technology, applied in the direction of pillars/supports, fillings, safety devices, etc., can solve the problems of violent surrounding rock activities in the roadway, difficulty in maintaining the stability of the roadway, and difficult maintenance of the roadway, so as to prevent spontaneous combustion , reduce pressure and maintain stability

Active Publication Date: 2009-02-25
HUAINAN MINING IND GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the implementation of this method, gob-side entry retention is the foundation and premise. However, because gob-side entry retention is strongly affected by two mining operations, the surrounding rocks of the roadway are violently active, and the maintenance of the roadway is difficult. To maintain the stability of the roadway, however, there is currently no more effective method

Method used

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  • Method of supporting along spatially keeping lane end

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Preparation

[0047] Cement, fly ash, gravel, sand and water, the amount of each component is by weight:

[0048] 14 parts of cement and 20 parts of fly ash

[0049] 28 parts of stone, 22 parts of sand, 16 parts of water

[0050] The content of the effective components of the composite admixture is 1.3% of the total amount of cement and fly ash by weight percentage.

[0051] The composition of used composite admixture is by weight:

[0052] 30 parts of polycarboxylic acid as water reducing agent,

[0053] Carboxymethylcellulose as a water-retaining agent is 1.5 parts,

[0054] Rosin thermopolymer as air-entraining agent is 1.2 parts,

[0055] Calcium chloride as an early strength agent is 67.3 parts.

[0056] The cement, fly ash, gravel and sand used are:

[0057] Cement: P.042.5 grade, fly ash: II grade, stone: maximum particle size: 6mm, sand: medium sand.

[0058] 2. Construction process

[0059] Cement, fly ash, gravel, sand and composite admixtures are ...

Embodiment 2

[0065] 1. Ingredients

[0066] Cement, fly ash, gravel, sand and water, the amount of each component is by weight:

[0067] 20 parts of cement and 7 parts of fly ash

[0068] 40 parts of gravel, 20 parts of sand, 13 parts of water

[0069] The active ingredient content of the composite admixture is 1.6% by weight of the total amount of cement and fly ash.

[0070] The composition of used composite admixture is by weight percentage:

[0071] 30 parts of polycarboxylic acid as water reducing agent,

[0072] Carboxymethylcellulose as a water-retaining agent is 1.5 parts,

[0073] Rosin thermopolymer as air-entraining agent is 1.2 parts,

[0074] Calcium chloride as an early strength agent is 67.3 parts.

[0075] The cement, fly ash, gravel and sand used are:

[0076] Cement: P.042.5 grade, fly ash: II grade, stone: maximum particle size: 6mm, sand: medium sand

[0077] Two, construction process is the same as embodiment 1

[0078] 3. Product performance:

[0079] 1. The...

Embodiment 3

[0083] 1. Preparation

[0084] Cement, fly ash, gravel, sand and water, the amount of each component is by weight:

[0085] 10 parts of cement and 40 parts of fly ash

[0086] 15 parts of stone, 15 parts of sand, 20 parts of water

[0087] The content of the effective components of the composite admixture is 1.5% of the total amount of cement and fly ash by weight percentage.

[0088] The composition of used composite admixture is by weight:

[0089] 30 parts of polycarboxylic acid as water reducing agent,

[0090] Carboxymethylcellulose as a water-retaining agent is 1.5 parts,

[0091] Rosin thermopolymer as air-entraining agent is 1.2 parts,

[0092] Calcium chloride as an early strength agent is 67.3 parts.

[0093] The cement, fly ash, gravel and sand used are:

[0094] Cement: P.042.5 grade, fly ash: II grade, stone: maximum particle size: 6mm, sand: medium sand

[0095] Two, construction process is the same as embodiment 1

[0096] 3. Product performance:

[00...

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Abstract

A method for supporting and protecting gob roadway walls built along the gob road-way is characterized in that the filling bodies of gob roadway walls are built along the working surface at the side of the goaf to establish a supporting and protecting belt for gob roadway walls. The method can effectively control the roof delamination of a direct roof and can timely cut off the roof and the lower basic roof and also can fill out goaf with the falling recrement, thereby reducing the bending of the basic roof, and the loading of the inner supporting and protecting structure and the deformation of the wall rock of the gob roadway, as well as keeping the stability of the gob roadway, meanwhile, the method also can seal the goaf, prevent air leaking and spontaneous combustion of coal, and avoid harmful air coming into the working area.

Description

technical field [0001] The invention relates to a support method for maintaining the stability of gob-side entry retention applied in underground coal mines. Background technique [0002] Anhui Huainan Mining Area is located in the hinterland of East China and is an important coal energy base in my country. The proven coal seams are all soft, low-permeability and high-gas coal seams, with gas reserves of 592.8 billion m 3 . [0003] In order to be able to extract the desorbed free gas from the mining layer and pressure relief layer through the crack channel circle formed by the overlying strata in the goaf affected by the mining to the upper part of the goaf and the annular crack circle, one method is to use Y-shaped ventilation is realized in the gob-side entry retention, and inclined gas drainage boreholes are set in the pressure relief fracture area. For the implementation of this method, gob-side entry retention is the foundation and premise. However, because gob-side...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D15/02E21F15/00
Inventor 袁亮程桦薛俊华郑是立孙全业孙道胜卢平王春林曹广勇
Owner HUAINAN MINING IND GRP
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