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Method for determining reasonable width of gob-side entrydriving narrow coal pillar

A definite method and narrow coal pillar technology, which is applied in earthwork drilling, surface mining, underground mining, etc., can solve problems affecting the recovery rate of mining areas, difficulties in roadway maintenance, and affecting safe mining of working faces, so as to reduce the amount of maintenance engineering and maintenance costs, ensuring long-term stability, high theoretical significance and practical value

Inactive Publication Date: 2015-05-06
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1
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AI Technical Summary

Problems solved by technology

On the one hand, if the width of the coal pillar is too large, the coal pillar will undergo strong creep deformation because it is in the peak area of ​​the fixed support pressure, making it difficult to maintain the roadway; at the same time, it will inevitably affect the recovery rate of the mining area
On the other hand, if the width of the coal pillar is too small, when affected by the secondary mining, the section of the roadway will shrink too much, which will affect the safe mining of the working face

Method used

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  • Method for determining reasonable width of gob-side entrydriving narrow coal pillar
  • Method for determining reasonable width of gob-side entrydriving narrow coal pillar
  • Method for determining reasonable width of gob-side entrydriving narrow coal pillar

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Embodiment

[0040] 1 Overview of engineering geological conditions

[0041]The 8105 working face of a certain mine has a strike length of 1360m, a mining face length of 200m, fully mechanized caving mining, a mining height of 3.2m, and a mining depth of 500m. The east of the 8105 working face is the coal pillar of Caojia Village, the south is the 8104 goaf, the west is the 8 coal 3 downhill, and the north is the 8106 goaf. The thickness of 8 coal is 5.44-7.96m, the average is 5.90m, the dip angle is 4°, f=2-3, and the occurrence is stable. The direct roof of coal 8 is gray-black mudstone, sandy mudstone interbedded with powder-fine-grained sandstone, with a thickness of 0.00-6.55m, which is a weak and unstable roof that is prone to caving. The basic roof is medium to fine-grained siltstone, which is a relatively stable roof with weak-medium hardness. The floor is taupe aluminous mudstone, with a thickness of 0.71-16.01m. It is a moderately hard and relatively stable floor, which swells ...

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Abstract

The invention discloses a method for determining a reasonable width of a gob-side entrydriving narrow coal pillar; theoretical calculation, numerical simulation, field actual measurement and other various means are adopted to determine the reasonable width of the coal pillar, a reasonable gob-side entrydriving position is determined, a fracture line of a main roof is guaranteed to be located at the side, close to a goaf, of the narrow coal pillar, long-term stability of the narrow coal pillar and a roadway is ensured, on one hand, the roadway latter maintenance work amount and maintenance costs are substantially reduced, on the other hand, safe and high-efficiency stoping of a working face is ensured. Therefore, the method for determining the reasonable width of the narrow coal pillar has relatively high theoretical significance and practical value.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a method for determining the reasonable width of a narrow coal pillar in a gob-side entry. Background technique [0002] With the deepening of coal mines, the stress of the surrounding rock of the roadway is increasing, which puts forward higher requirements for the stability control of the surrounding rock of the roadway, and at the same time brings safety hazards such as rock bursts. Columns have an important impact on the safe mining and recovery rate of the working face. On the one hand, if the width of the coal pillar is too large, the coal pillar will undergo strong creep deformation because it is in the peak area of ​​the fixed support pressure, making it difficult to maintain the roadway; at the same time, it will inevitably affect the recovery rate of the mining area. On the other hand, if the width of the coal pillar is too small, when affected by the secondary mining, the s...

Claims

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Application Information

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IPC IPC(8): E21C41/16
CPCE21C41/18
Inventor 王红胜双海清李树刚李安洪李洪涛郑祥举
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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