Method for determining sizes of and distance between artificial pillars for room coal pillar recycling

A technology of artificial ore pillars and room-type coal pillars, applied in mining equipment, earthwork drilling, filling and other directions, can solve problems such as staying in primary ore pillars, and achieve the effect of avoiding accidents, ensuring high efficiency, and ensuring safe production in mines

Inactive Publication Date: 2017-06-20
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology

At present, the room-and-pillar method, which uses concrete pouring artificial pillars to replace the original

Method used

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  • Method for determining sizes of and distance between artificial pillars for room coal pillar recycling
  • Method for determining sizes of and distance between artificial pillars for room coal pillar recycling
  • Method for determining sizes of and distance between artificial pillars for room coal pillar recycling

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[0041] The method for determining the size and spacing of the artificial pillars of the recovered room-type coal pillars of the present invention: in the process of recovering the room-type coal pillars, the process of supporting the upper roof by the room-type coal pillars is divided into the stage of separate roof support by the artificial pillars Combined support stage with artificial pillars and solid filling materials; according to the force balance principle and Winkel foundation model, according to the support characteristics of two different stages, the artificial pillars alone support the roof stage and the artificial pillars cooperate with solids The mechanical model of the combined support stage of the filling material shows the force of the artificial pillar. According to the artificial pillar, the load should be less than its allowable stress [σ 1 ], draw the relationship between the artificial pillar size a×a and the artificial pillar spacing l at the stage when the...

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Abstract

The invention discloses a method for determining the sizes of and the distance between artificial ore pillars for room coal pillar recycling. In the room coal pillar recycling process, the supporting and protecting process of room coal pillars to a roof over the room coal pillars is divided into a stage that the roof is independently supported and protected by artificial ore pillars, and a combined supporting and protecting stage that the artificial ore pillars cooperate with solid filling materials; and a mechanical model of the artificial ore pillars and the roof is built according to the supporting and protecting characteristics of the two stages on the basis of the force equilibrium principle and a winkler foundation model, and the stress condition of the artificial ore pillars is obtained. According to the criterion that the load of the artificial ore pillars should be smaller than the allowable stress [sigma 1] of the artificial ore pillars, the relation between the allowable stress of the artificial ore pillars, the size a*a of the artificial ore pillars, and the distance between the artificial ore pillars in the two supporting and protecting stages is obtained, the relationship of the size of the artificial ore pillars and the distance between the artificial ore pillars during different stages is obtained through the relation, and finally, the size of the artificial ore pillars and the distance between the artificial ore pillars are comprehensively determined. The method is simple and easy to implement and high in accuracy and has important influence on development of the room coal pillar safety recovery basic theory in China.

Description

technical field [0001] The invention relates to a method for determining the recovered room-type coal pillar in filling mining, in particular to a method for determining the size and spacing of artificial pillars suitable for recovering the room-type coal pillar. Background technique [0002] The mining areas in western my country have attracted much attention at home and abroad for their rich reserves, excellent coal quality, simple geological structure and superior mining conditions. Since the 1980s, the national coal market has been weak, and many places in this region have adopted a large number of coal mines with relatively low production costs. The "room-and-pillar" or "residual-pillar" method of drilling and blasting coal mining has a low level of production technology and equipment and backward production technology. In pillar-type gobs, these legacy house-type coal pillars will cause a great waste of national resources on the one hand, and on the other hand, due to th...

Claims

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Application Information

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IPC IPC(8): E21F15/00
CPCE21F15/00
Inventor 张吉雄韩晓乐方坤张强陈亚东钟思见
Owner CHINA UNIV OF MINING & TECH
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