A method of retaining half-alley and gob-side alley

A technology for empty roadway and roadway retention, which is applied in earthwork drilling, surface mining, underground mining and other directions, can solve the problems such as the inability to effectively solve the problem of the repair rate of the stope mining pressure roadway, and can solve the problem of gas over-limit in the upper corner and improve the Resource recovery rate and the effect of reducing the 10,000-ton excavation rate

Active Publication Date: 2021-05-04
ZHONGBEI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Since the roadway retaining period is the time period when the stope pressure of the coal mining face appears the most serious, for high stress or ultra-high stress coal face, the above four methods cannot effectively solve the problems of stope mine pressure and roadway renovation rate

Method used

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  • A method of retaining half-alley and gob-side alley

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Effect test

Embodiment approach 1

[0018] The maximum horizontal principal stress of the 15# coal seam 15108 coal mining face in a mine is 26.68MPa, the minimum horizontal principal stress is 14.36MPa, and the vertical stress is 18.79MPa, which is a medium-high stress area. , excavation along the roof and floor of the 15# coal seam, with a rectangular section, 4.2m wide, 4.0m high, and a sectional area of ​​16.8m2. The classification result of surrounding rock is grade Ⅳ, unstable surrounding rock. In the roadway, implement a method for retaining half-alley and gob-side entry of the present invention, the steps are:

[0019] In the return air trough 3 of the high-stress coal mining face 15108 (1), the gob-side retaining is carried out. The width of the entry retention is 1 / 2 of the width of the return air trough 3, which is 2.1m. In the return air trough 3 of the stress mining face 15108 (1), the height of the space 6 to be poured is the height of the return air trough 3, which is 4.0m, the width of the space ...

Embodiment approach 2

[0022] The burial depth of the 3201 coal mining face in the second mining area of ​​the 3# coal seam of a mine is about 300m, the thickness of the coal seam is 7m, fully mechanized top coal caving mining, high gas mine, the return air channel is 4.2m wide and 3.5m high. In this roadway, a method of retaining a half-alley and gob-side entry of the present invention is implemented, and the gob-side entry is carried out in the return air trough of the high-stress coal mining face 3201. The width of the entry is 2.1m, and the space to be poured is arranged in In the return air channel of the high-stress coal mining face 3201, the height of the space to be poured is 3.5m, the width of the space to be poured is 1.0m, and the length of the space to be poured is 4.0m; after pouring, the roadway is reserved as the high-stress coal mining face 3201 The return air tunnel is used to form a Y-shaped one-inlet and two-return ventilation mode; when it is used as a replacement for the 3203 air...

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Abstract

The invention discloses a gob-side entry retaining method, which belongs to the technical field of green mining without coal pillars. The half-entry process is adopted to carry out gob-side entry retention on high-stress or ultra-high-stress coal mining face return air along the trough. The width of the roadway retention is 1 / 2 of the width of the original return air trough, and the roadway retention period is the time period when the stope pressure on the coal mining face is the most serious, effectively controlling the mine pressure manifestations such as coal wall deviation, bottom heave, and roof separation layer phenomenon, effectively reducing the repair rate of the roadway, and forming a Y-shaped one-inlet and two-circle ventilation mode, which can effectively solve the problem of gas overrun in the upper corner of the coal mining face; The side of the coal pillar is expanded to restore the width of the trough.

Description

technical field [0001] The invention relates to a method for retaining a half-entry and gob-side entry, and belongs to the technical field of coal pillar-free green mining. Background technique [0002] At present, the methods of green mining without coal pillars in domestic coal mines are mainly gob entry retention with roof cutting and pressure relief self-formed entry entry, flexible formwork concrete gob entry entry retention, paste filling gob entry entry retention, and high water quick-setting filling gob entry entry retention, etc. method. Among them, the roof cutting and pressure relief self-formed roadway retaining method along the goaf, that is, the 110 construction method, is to use constant resistance anchor cables for reinforcement and support at the 0.3m distance from the cutting seam line along the wind inlet of the coal mining face. A row of blast holes is constructed on the top line, and energy-gathering kerf blasting cuts off the connection between the roo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 韩文梅李建军张建军武晋文关学锋杨文博
Owner ZHONGBEI UNIV
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