Gob-along roadway protection technology with narrow coal pillar and deep buried thick coal seam
A technology of narrow coal pillar and thick coal seam, applied in pillars/supports, shaft lining, tunnel lining, etc., can solve the problem of the difficulty of supporting the narrow coal pillar gob-side roadway, reduce the deformation of the surrounding rock of the roadway, control the roadway deformation effect
Active Publication Date: 2018-04-20
SHANDONG XINJULONG ENERGY
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Problems solved by technology
[0003] In order to solve the problem of difficult roadway support for narrow coal pillars along the goaf in working faces with deep buried thick coal seams, this invention proposes a narrow coal pillar gobside roadway protection technology, which can effectively control the deformation of the roadway and meet production needs
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[0019] With reference to the accompanying drawings, the gob-side protection roadway technology of the present invention is further described with a narrow coal pillar in a deep buried thick coal seam:
[0020] First, if figure 1 , figure 2 , image 3 As shown, after the gob-side roadway is excavated according to the designed section, the roof and the two sides are first supported in the form of "anchor belt mesh", that is, a layer of steel mesh 1 is hung on the roof and the two sides first, and then steel belts are used to support the roof and the two sides. 2 Press down, and then anchor the steel strip 2 on the roof with the anchor rod 3; the above-mentioned steel strip 2 is arranged along the section of the roadway, the distance between the steel strip 2 is 1000mm, and there is an anchor on the steel strip 2 every 900mm. Rod holes, so that the anchor rods 3 are arranged in the form of row spacing of 900×1000mm; the anchor rods 3 on the top plate adopt φ22×2500mm MSGLW-600...
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The invention discloses a kilometers-deep thick coal seam narrow coal pillar gob-side entry supporting process which is characterized by comprising the following steps: first, after a gob-side entry is dug according to the designed cross section, the roof and the two sides are supported in an 'anchor + band + net'-based supporting mode; second, the roof and the two sides are supported in a reinforced manner; and third, the gob-side entry is fore-poled. By combining 'anchor + band + net'-based supporting and anchor beam-based supporting, entry deformation can be effectively controlled, and the entry can meet the production needs of next working face. Unit-support forepolings are adopted in the gob-side entry in front of the working face to provide support in advance, and the amount of entry surrounding rock is significantly reduced. Compared with supporting based on single props, the average deformation of the two sides is reduced by 566mm, the convergence of the roof and the floor is reduced by 767mm, and the amount of floor heaving is reduced by up to 473mm.
Description
technical field [0001] The invention relates to coal mine mining technology, in particular to a gob-side roadway protection technology. Background technique [0002] At present, the depth of coal mining has reached 1,000 meters. With the increase of depth and intensity of coal mining, and the large demand for energy, many deep mines generally adopt the way of leaving narrow coal pillars along the gob for the backing roadway on the side of the goaf. Due to the increase of mining depth year by year, especially in the mining of thick coal seams (above 3.5m), the gob-side roadway highlights the strong deformation of the surrounding rock and the large damage range, which is prone to roof caving and slabs. It makes the maintenance of the gob-side roadway more and more difficult, restricts the advancing speed and safe production of the working face, and seriously affects the construction of a safe and efficient working face. The research on the support has also achieved certain r...
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IPC IPC(8): E21D11/15E21D20/00E21D15/00
CPCE21D11/152E21D11/155E21D15/00E21D20/00
Inventor 孙广京李爱民张治高李志深卢诗祥王延辉徐波谭文峰
Owner SHANDONG XINJULONG ENERGY