Coal pillar-free exploitation Y-shaped venting goaf drilling hole location method

A technology of drilling layout and goaf, which is applied in the direction of mining fluid, mining equipment, earthwork drilling and mining, etc., can solve the problems affecting the safety and efficient production of coal mining face, and achieve the accuracy and determination of the plastic zone and sealing height Accurate, accurate positioning effect

Inactive Publication Date: 2014-05-28
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

[0005] In the existing gob-side entry retaining Y-shaped ventilated goaf roof pressure relief gas drainage method, it fails to solve the problem of how to find the gas-enriched area in the overlying strata of the goaf, which seriously affects the coal mining face safe and efficient production

Method used

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  • Coal pillar-free exploitation Y-shaped venting goaf drilling hole location method
  • Coal pillar-free exploitation Y-shaped venting goaf drilling hole location method
  • Coal pillar-free exploitation Y-shaped venting goaf drilling hole location method

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Effect test

Embodiment 1

[0053] Embodiment one: if figure 1 As shown, a method for determining the gas enrichment area in a Y-shaped ventilated goaf is characterized in that it includes the following steps:

[0054] Step 1. The step of obtaining the gas migration law in the gob-side entry Y-shaped ventilation goaf; the acquisition of the gas migration law in the gob-side entry Y-shaped ventilation goaf is carried out according to the following steps:

[0055] B1. Carry out a similar simulation test on a rotatable box-type similar simulation test bench, and obtain the distribution law of the mining fracture field based on the three-dimensional laser scanning technology;

[0056] B2. Use UDEC (Universal Distinct Element Code, the discrete element method program of ITASCA Company) to simulate the field conditions to obtain the distribution law of the mining fracture field;

[0057] B3. Construct an observation borehole on the coal seam roof in front of the working face on site, use a borehole imager to ...

Embodiment 2

[0084] Embodiment 2: The flow process of the present invention is basically the same as Embodiment 1, the difference is: the gas source item is determined according to the on-site working conditions according to the following steps:

[0085] calculate Q g = l · ρ m · q 0 · v 0 · [ exp ( - l 1 v 0 t 0 ) - exp ( - l 2 v 0 ...

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Abstract

The invention discloses a coal pillar-free exploitation Y-shaped venting goaf drilling hole location method and belongs to the field of gas extraction. Drilling hole location is performed according to a gob-side entry retaining Y-shaped goaf gas moving law and a gas enrichment area, so the gas extraction effect is good, an extraction drilling hole penetrates through a caving zone and a fault zone in sequence to reach the lower part of a curved sinking zone, the problem of accurate positioning of the gas extraction holes of overlaying strata structures of different coal measure stratas is solved, and the gas extraction effects are ensured. As massive pressure-relieving gas and the goaf gas are extracted, the problems of upper corner gas ultralimit and return air gas ultralimit are fundamentally solved, and the safety production of a mine is ensured. Meanwhile, under the premise of ensuring the extraction effects, the drilling hole location method is strongly targeted at the gas enrich area, thus reducing the extraction hole number and enlarging the extraction hole location interval; the method has the advantages of small work amount and economy.

Description

technical field [0001] The invention belongs to the field of gas extraction, and in particular relates to a method for arranging boreholes in a Y-shaped ventilated goaf based on coal pillar-free mining. Background technique [0002] The source of gas in the mining space of a mine is mainly the gas gushing out of the working face and the goaf and the gas gushing in from the adjacent layers. The gas gushing out of the goaf accounts for about 40% of the gas gushing out of the mining space. In some mines, the gas gushing out of the goaf Gas accounts for 60% to 70% of the total gas emission in the mining space. Therefore, it is of great significance to study the laws of gas migration and enrichment in goafs for the prevention and control of mine gas disasters, the realization of gas drainage in goafs and the realization of coal and gas co-mining technologies. [0003] Before the ore body is mined, the rock mass is in a state of equilibrium. When the ore body is mined, an underg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/30
Inventor 尹光志李铭辉许江李文璞张东明黄滚王维忠蒋长宝宋真龙尚德磊邓博知韩佩博李生舟
Owner CHONGQING UNIV
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