Asymmetrical bolt-net-cable combined supporting method for special-shaped recovery tunnel of large inclination angle coal bed
A technology of mining roadway and large inclination angle, which is applied in the direction of mining equipment, earthwork drilling and bolt installation, etc. It can solve problems such as difficult maintenance, strong drumming, deformation of roadway surrounding rock, etc., to solve particularly serious deformation and reduce the number of repairs , cost reduction effect
Inactive Publication Date: 2013-10-30
ANHUI UNIV OF SCI & TECH
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Problems solved by technology
However, due to the lack of in-depth research on the structural characteristics of the roadway surrounding rock, the stress load transfer characteristics of the roadway surrounding rock, and the mine pressure characteristics of the roadway with a coal seam dip angle of 25°-45°, especially for the roadway roof, high side of the roadway and low roadway The mechanical characteristics of the surrounding rock are not clear, and conventional bolt support is used, resulting in particularly serious deformation of the roadway surrounding rock, strong bulging of the side, difficult maintenance, and frequent repairs, high cost of roadway support, and difficulty in adapting to large-angle coal seam recovery The requirements for asymmetric deformation of the surrounding rock of the roadway cannot meet the requirements for safely controlling the stability of the surrounding rock of the roadway
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[0032] The inclination angle of the coal seam in this embodiment is 28°, figure 1 with figure 2 Shown is a solid coal mining roadway, image 3 with Figure 4 Shown is the mining roadway with small coal pillars. The cross-section dimensions of the solid coal mining roadway and the small coal pillar mining roadway are: roadway width 4800mm, roadway low side height 1600mm, roadway high side height 4150mm, small coal pillar width 5000mm, and asymmetric anchor mesh cable for large inclined coal seam special-shaped mining roadway The combined support method, the implementation steps are as follows:
[0033] 1. Excavate the roadway according to the shape of the roadway section 1, and then use the prestressed bolt 2, the steel mesh 3 and the steel belt 4 to support the roadway roof, the roadway high side and the roadway low side surrounding rock.
[0034] Among them, the prestressed bolt 2 adopts high-strength prestressed bolts with a diameter of 25mm and a length of 2500mm; the ultimate...
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The invention discloses an asymmetrical bolt-net-cable combined supporting method for a special-shaped recovery tunnel of a large inclination angle coal bed. The method is characterized by comprising the following steps of: digging the tunnel according to the shape of the tunnel section, and supporting tunnel top plates, tunnel high-cut surrounding rock and tunnel low-cut surrounding rock by using prestressed anchor rods, steel bar nets and steel strips; arranging top plate prestressed anchor cables on the tunnel top plates; for the solid coal recovery tunnel, arranging high-cut prestressed anchor cables on the tunnel high-cut surrounding rock when the tunnel is dug for 5 to 7 days, and arranging struts in the center of the tunnel towards one side of the low-cut surrounding rock; and for the small coal post reserved recovery tunnel, arranging low-cut prestressed anchor cables on the tunnel low-cut surrounding rock when the tunnel is dug for 5 to 7 days, and arranging struts in the center of the tunnel towards one side of the low-cut surrounding rock. The combined asymmetrical supporting method has good application effect of stability control of the special-shaped recovery tunnel of the large inclination angle coal bed, the repair frequency of the tunnel is greatly reduced, and the supporting cost of the tunnel is reduced.
Description
Technical field [0001] The invention relates to a method for supporting a special-shaped mining roadway in a large inclination angle coal seam with a coal seam inclination angle of 25° to 45°, and more specifically to a method suitable for a non-symmetrical structure coal mining roadway with large surrounding rock deformation and serious bulging. Support method. Background technique [0002] The large inclination coal seams with coal seam inclination angles of 25°~45° have a certain amount of occurrence in the world. They are mainly distributed in Urumqi, Beijing, Huainan, Kailuan, Xuzhou, Changguang, Nantong, Zixing, Datong, etc. This mining area accounts for more than 14% of the mineable coal seams. [0003] At present, most of the mining roadways in high-incline coal seams are supported by U-shaped steel retractable supports or I-beam supports. During the mining period, the roadways are severely deformed, and there are many repairs and maintenance is extremely difficult. Not on...
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IPC IPC(8): E21D21/00E21D20/00
Inventor 谢广祥杨科
Owner ANHUI UNIV OF SCI & TECH