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Method for reserving and supporting special-shaped gob-side roadway for longwall mining along strike of large-inclination medium-thick coal seam

A technology with thick coal seam and large inclination angle, applied in mining equipment, earthwork drilling, safety devices, etc., can solve the complex situation of the roof and floor of the coal seam, the complex stress environment of the surrounding rock in the transportation level roadway, and the difficulty of retaining and supporting the gob-side roadway. It can achieve the effect of stable support, simple implementation, and reduction of deformation of surrounding rock.

Active Publication Date: 2020-03-27
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] In the mining of high-inclination coal seams, due to the large inclination angle, the roof and floor of the coal seam are complex, and the roof collapse and gangue filling have nonlinear characteristics along the inclination, resulting in a complex stress environment for the surrounding rock of the transport level roadway at the lower part of the working face. High difficulty

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  • Method for reserving and supporting special-shaped gob-side roadway for longwall mining along strike of large-inclination medium-thick coal seam
  • Method for reserving and supporting special-shaped gob-side roadway for longwall mining along strike of large-inclination medium-thick coal seam
  • Method for reserving and supporting special-shaped gob-side roadway for longwall mining along strike of large-inclination medium-thick coal seam

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Embodiment 1

[0039] This embodiment provides a method for retaining and supporting special-shaped gob-side roadways in longwall mining with large dip angles and medium thickness coal seams; figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, the thickness of the coal seam is 2m-3m, and the inclination angle of the coal seam is 35°-55°.

[0040] Step 1: Reservation of gob-side roadway in medium-thick coal seam with large dip angle. Such as figure 1 , including: working face 1 in the current section, mining working face 2 in the lower section, air return level roadway 3 in the working face, hydraulic support in the working face 4, goaf 5, top cutting line 6, flexible molded concrete wall 7, gangue retaining Support 8, bamboo fence 9, working face transportation level lane 10, working face end support 11, gob-side retaining lane 12, top plate "O-X" broken D; figure 2 As shown, it includes: cut top line 6, flexible molded concrete wall 7, gangue retaining bracket 8, bamboo...

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Abstract

The invention provides a method for reserving and supporting a special-shaped gob-side roadway for longwall mining along the strike of a large-inclination medium-thick coal seam. The method comprisesthe following steps: 1, reserving of the gob-side roadway of the large-inclination medium-thick coal seam; 2, flexible formwork concrete and flexible cushion layer strong-weak combined roadside filling support; and 3, single prop and full-anchor system rigid-flexible combined roadway interior support. By means of the method, the stability of gob-side entry retaining of the large-inclination medium-thick coal seam can be achieved, the coal recovery rate is improved, the labor intensity of workers is reduced, and the construction safety is greatly improved.

Description

technical field [0001] The invention relates to the field of coal mine mining and roadway support; in particular, it relates to a method for retaining and supporting a special-shaped gob-side roadway for mining with a large dip angle and a medium-thick coal seam moving toward a long wall. Background technique [0002] With the implementation of the sustainable development strategy of coal resource mining in my country, gob-side entry retention, as an effective coal pillar-free mining technology, has been successfully applied in near-horizontal, gently inclined, thin and medium-thick coal seams and with good roof and floor conditions. . The roadway retention methods are divided into in-situ and semi-in-situ roadway retention. The support methods include roadway support and roadside support. The roadway support mainly adopts bolts, anchor nets, etc. to strengthen the support to improve the stability of the surrounding rock The roadside support mainly adopts small coal pillars,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/04E21D20/02
CPCE21D20/02E21F15/04
Inventor 王宏伟焦建强宋远洋
Owner XIAN UNIV OF SCI & TECH
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