Stability and control of room mining coal pillars—taking room mining coal pillars of solid backfill recovery as an example

ZHANG Ji-xiong; HUANG Peng; ZHANG Qiang; LI Meng; CHEN Zhi-wei

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Stability and control of room mining coal pillars—taking room mining coal pillars of solid backfill recovery as an example

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The stability of room mining coal pillars during their secondary mining for recovering coal was analyzed. An analysis was performed for the damage and instability mechanism of coal pillars recovered by the caving mining method. During the damage progression of a single room coal pillar, the shape of the stress distribution in the pillar transformed from the initial stable saddle shape to the final arch-shaped distribution of critical instability. By combining the shapes of stress distribution in the coal pillars with the ultimate strength theory, the safe-stress value of coal pillar was obtained as 11.8 MPa. The mechanism of instability of coal pillar groups recovered by the caving mining method was explained by the domino effect. Since the room coal pillars mined and recovered by the traditional caving mining method were significantly influenced by the secondary mining during recovery, the coal pillars would go through a chain-type instability failure. Because of this limitation, the method of solid backfilling was proposed for mining and recovering room coal pillars, thus changing the transfer mechanism of stress caused by the secondary mining (recovery) of coal pillars. The mechanical model of the stope in the case of backfilling and recovering room coal pillars was built. The peak stress values inside coal pillars varied with the variance of backfilling ratio when the working face was advanced by 150 m. Furthermore, when the critical backfilling ratio was 80.6%, the instability failure of coal pillars would not occur during the solid backfill mining process. By taking Bandingliang Coal Mine as an example, the coal pillars' stability of stope under this backfilling ratio was studied, and a project scheme was designed.

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《中南大学学报（英文版）》 |2017年第5期|1121-1132|共12页
作者
ZHANG Ji-xiong; HUANG Peng; ZHANG Qiang; LI Meng; CHEN Zhi-wei;
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作者单位

School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

The State Key Laboratory for Geo Mechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;

School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

School of Mines, China University of Mining & Technology, Xuzhou 221116, China;

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Stability and control of room mining coal pillars—taking room mining coal pillars of solid backfill recovery as an example

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