Surrounding rock stability control method adapted for coal mining area main roadway

Patent metadata

Field	Value
Publication number	US-12221887-B2
Application number	US-202017605771-A
Country	US
Kind code	B2
Filing date	Apr 15, 2020
Priority date	Apr 23, 2019
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

The present disclosure relates to a technical field of coal mining, in particular to a surrounding rock stability control method adapted for a coal mining area main roadway. The method comprises the following steps: reinforcing support on a roof and two sides of the mining area main roadway on a basis of an original support form; digging a safety roadway along a stop line of a present working face required by coal mine design, and supporting the safety roadway, wherein a protective coal pillar is formed between the safety roadway and the mining area main roadway; performing slitting blasting on the roof in the safety roadway, wherein blast holes are arranged on a roadway corner line on one side of the present working face to form a pre-splitting slit; and performing stoping at a next working face after completing coal mining at the present working face when stoping at the present working face advances to the safety roadway. By cutting the roof and relieving pressure at the stop mining line of the working face, an influence of mining disturbance on stability of the mining area main roadway in the stoping process of the working face is reduced, and by reinforcing support, a yielding deformation capacity of the mining area main roadway is improved, and the stability of the surrounding rock of the mining area main roadway is further improved.

First claim

What is claimed is:

1. A surrounding rock stability control method adapted for a coal mining area main roadway, comprising the following steps:
reinforcing support on a roof and two sides of the mining area main roadway on a basis of an original support form;
digging a safety roadway along a stop mining line of a present working face required by coal mine design, and supporting the safety roadway, wherein a protective coal pillar is formed between the safety roadway and the mining area main roadway;
performing slitting blasting on the roof in the safety roadway, wherein blast holes are arranged on a roadway corner line on one side of the present working face to form a pre-splitting slit,
and a latest time of completing construction of the pre-splitting slit is when a length of the present working face to be stopped is equal to a width of the protective coal pillar; and performing stoping at a next working face after completing coal mining at the present working face when stoping at the present working face advances to the safety roadway.

2. The surrounding rock stability control method adapted for a coal mining area main roadway of claim 1 , wherein one end of the pre-splitting slit extends to a roadway corner line of a first gateway near a previous working face, another end of the pre-splitting slit extends to a roadway corner line of a second gateway near the next working face, and both ends of the pre-splitting slit extend along the roadway corner lines of the two gateways to a direction away from the safety roadway.

3. The surrounding rock stability control method adapted for a coal mining area main roadway of claim 2 , wherein a length of the pre-splitting slit extends along the roadway corner line of the first gateway or the second gateway is 10 m to 15 m.

4. The surrounding rock stability control method adapted for a coal mining area main roadway of claim 1 , wherein in a step of reinforcing support on the roof and two sides of the mining area main roadway, a constant resistance support structure is used for reinforcing support on the roof, and a grouting anchor cable is used for reinforcing support on the two sides.

5. The surrounding rock stability control method adapted for a coal mining area main roadway of claim 4 , wherein substantially simultaneously with a stoping process of a working face, the grouting anchor cable is used to grout the roof and sides of the mining area main roadway with cracks, so as to improve strength of surrounding rock of the roof and sides.

6. The surrounding rock stability control method adapted for a coal mining area main roadway of claim 1 , wherein in a step of performing slitting blasting on the roof in the safety roadway, the blast hole is designed to be 8000 mm to 1000 mm in depth and 42 mm in diameter, leans to the working face and has an angle of 10° to 20° with a plumb line, and spacing between blast holes is 400 mm to 700 mm.

7. The surrounding rock stability control method adapted for a coal mining area main roadway of claim 6 , wherein in a step of performing slitting blasting on the roof in the safety roadway, a bidirectional tensile shaped charge device is used for shaped charge blasting, a shaped charge blasting tube is used for loading 3 #emulsion explosive, and decoupling deck charging is used for blasting to form the pre-splitting slit.

Assignees

• Univ China Mining
• Univ China Mining

Inventors

• Wang Jiong
• Yu Guangyuan
• Jiang Jian

Classifications

• E21D9/14

  Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings · CPC title

• E21D20/02

  with provisions for grouting · CPC title

• E21C41/18 Primary

  for brown or hard coal · CPC title

• F42D3/04

  for rock blasting · CPC title

• E21D20/00 Primary

  Setting anchoring-bolts (anchoring bolts for shafts, tunnels or galleries E21D21/00; means for anchoring structural elements or bulkheads specially adapted to foundation engineering E02D5/74; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose F16B13/00) · CPC title