Deep well coal-pillar-free gob-side entry driving method and formed roadway

A coal pillar-free, deep well technology, applied in tunnels, wellbore linings, tunnel linings, etc., can solve problems such as large engineering volume, narrow scope of application, and complex processes

Pending Publication Date: 2021-07-30
NORTH CHINA INST OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the technical problems of narrow application range, complicated process and large engineering quantity of the existing technology, the present invention changes the structure of the broken coal rock mass and the layout position of the roadway at the side of the goaf, and proposes a method of driving along the goaf without coal pillars in a deep mine and t

Method used

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  • Deep well coal-pillar-free gob-side entry driving method and formed roadway
  • Deep well coal-pillar-free gob-side entry driving method and formed roadway
  • Deep well coal-pillar-free gob-side entry driving method and formed roadway

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Embodiment 1

[0038] Such as Figure 1~3 As shown, a gob-side entry method without coal pillars in a deep mine comprises the following steps:

[0039] 1) Construction of airtight walls

[0040] In the mining process of the last working face, a closed wall 13 is constructed at intervals of d in the downward channel by stacking coal powder bags, where d is twice the length of the closed wall 13;

[0041] 2) Construction advanced grouting drilling

[0042] Drill four advance grouting holes 11 with a diameter of 150mm at the head-on face of the gob-side excavation roadway 1.5m away from the top plate. The advance grouting holes 11 are parallel to the bottom plate of the excavation roadway 4 and form an angle of 30° with the axis direction of the excavation roadway 4. Included angle, the first advanced grouting drilling is 0.5m away from the goaf side roadway side, and the other advanced grouting drilling holes are arranged in a straight line perpendicular to the roadway side at intervals of 0...

Embodiment 2

[0050] Such as Figure 1~3 As shown, a gob-side entry method without coal pillars in a deep mine comprises the following steps:

[0051] 1) Construction of airtight walls

[0052] In the mining process of the last working face, a sealed wall 13 is constructed at intervals of d in the downward channel by stacking coal powder bags, and d is the same length as the sealed wall 13;

[0053] 2) Construction advanced grouting drilling

[0054] Drill four advanced grouting holes 11 with a diameter of 120mm at the head-on face of the gob-side driving roadway 1.0m away from the top plate. The advanced grouting holes 11 are parallel to the bottom plate of the roadway 4 and form 20° with the direction of the axis of the roadway 4. Included angle, the first advanced grouting drilling is 0.3m away from the side roadway side of the goaf, the other advanced grouting drillings are arranged in a straight line perpendicular to the roadway side at intervals of 0.3m, and the final hole is in the...

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Abstract

The invention relates to the technical field of coal mining, in particular to a deep well coal-pillar-free gob-side entry driving method and a formed roadway. The deep well coal-pillar-free gob-side entry driving method comprises the steps of constructing a closed wall, constructing an advanced grouting drilling hole, constructing an observation drilling hole, grouting a residual area of a gate road under a previous working face and performing gob-side entry driving construction. Solid coal is positioned on one side of the formed roadway, a filling separation wall is positioned on the other side of the formed roadway, and the filling separation wall is positioned in the residual area of the gate road under the previous working face. According to the deep well coal-pillar-free gob-side entry driving method, a narrow coal pillar in the prior art is omitted, a filling material is used for filling the residual space of the adjacent roadway to form the low-elasticity filling separation wall, resource waste is reduced, meanwhile, the safety of gob-side entry driving is greatly improved, the process is simple, and operation is easy.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for digging a gob-side roadway in a deep mine without coal pillars and the roadway formed. Background technique [0002] Coal mining in my country generally adopts the method of digging along the goaf with narrow coal pillars with a width of 3-6m. This method mainly has the following three problems. Second, narrow coal pillars are damaged by dynamic pressure, which cannot effectively block gas and water in goafs. Third, leaving narrow coal pillars causes waste of coal resources. In view of this, Chinese scholars have tried a variety of coal pillar-free mining technologies along the goaf in recent years. [0003] Meng Jinsuo of the General Institute of Coal Science Research proposed the concept of "in-situ" gob-side excavation for fully-mechanized caving, that is, excavating the roadway at the position of the original abandoned roadway in the upper section to serve th...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21F17/103E21F15/04
CPCE21D9/00E21D11/105E21F17/103E21F15/04
Inventor 刘金海李昊高林生朱权洁康庆涛王悦平
Owner NORTH CHINA INST OF SCI & TECH
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