Sectional coal pillar-free exploitation method
A mining method and technology without coal pillars, applied in ground mining, mining equipment, earth cube drilling and mining, etc., can solve problems such as difficulties in construction space maintenance and construction organization, hindering normal production of the working face in the upper section, affecting high production and high efficiency, etc. Achieve the effects of wide practicability, simple method and improved recovery rate
Inactive Publication Date: 2013-07-03
CHINA UNIV OF MINING & TECH
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Problems solved by technology
The maintenance of construction space and construction organization are difficult, and there are great potential safety hazards. The key is to hinder the normal production of the working face in the upper section during the filling process, affecting high production and high efficiency.
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[0013] figure 1 As shown, between the working face 2 of the upper section and the working face 3 of the lower section, there is an upper section transport levelway 1 supported by anchor rods (cables), etc., and the rear part of the working face 2 of the upper section is mining Empty area 5, in the upper section transportation level roadway 1 after the mining of the upper section working face 2, close to the side coal wall of the lower section working face 3, use the filling material to construct the top filling wall 4 in the roadway for filling When filling the roadway, it is necessary to ensure that the filling wall 4 in the roadway is tightly connected with the roof and floor of the roadway without air leakage, and the compressive strength of the filling wall 4 connected to the top is not less than 5 MPa after compaction. If the upper section transport entryway 1 is a large-section entryway, that is, the width of the entryway exceeds 5m, it is only necessary to fill part of ...
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The invention discloses a sectional coal pillar-free exploitation method, which comprises the following steps of: constructing an in-lane roof-contact wall body in a place close to a lower section working surface side coal wall section by section as an upper section working surface advances till the recovery of the upper section working surface is finished; and excavating a lower section haulage roadway of the lower section working surface close to the filling wall body, by the supporting of the filling wall body, exploiting the lower section working surface, sequentially circulating, and finishing the coal exploitation of the whole area. The method overcomes the disadvantage that a mined out region cannot be well isolated because a coal pillar drift is arranged between traditional sections or the traditional sections are completely arranged along a gob entry. Exploitation without the coal pillar can be realized; mining rate of coal resources is improved; the aim of cleanly producing coal and reducing environmental damage is fulfilled; and the method is suitable for exploiting thin, middle and thick coal beds. The method is simple, safe, reliable and good in effect.
Description
technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal pillar-free mining method suitable for thick coal seam working faces. Background technique [0002] At present, coal pillars are left between the working faces of the mining (belt) areas in most of the country's mining areas. Effect of mine pressure on working face. In order to reduce the loss of coal pillars in sections between working faces, coal scientific research workers have proposed the technology of gob-side driving and gob-side entry retention on the basis of studying the law of mine pressure appearance in working faces. [0003] The technology of gob-side entry can be divided into complete gob-side entry (no coal pillars) and gob-side entry with narrow coal pillars. Since the water and gas in the goaf and the falling gangue will pose a danger to the normal excavation of the roadway and have a certain impact on the ventilation of the excavation, it is genera...
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IPC IPC(8): E21C41/16E21F15/04
Inventor 马立强张东升
Owner CHINA UNIV OF MINING & TECH