Coal Engineering ›› 2023, Vol. 55 ›› Issue (3): 36-40.doi: 10.11799/ce202303007

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Study on Dense Drilling Pressure Relief in Irregular Pillar along Fault

  

  • Received:2022-08-22 Revised:2022-11-17 Online:2023-03-20 Published:2023-04-11
  • Contact: SUN Yanbin SONG HouwuPENG Xiangfeng E-mail:1134781551@qq.com

Abstract: In view of the instability problem of the coal column roadway in Fucun Coal Mine under the complex geological conditions of the secondary mining, theoretical analysis, numerical simulation and field measurement were conducted. The main work and conclusions are as follows. The technical parameters of dense drilling top cutting are rationally configured according to the theory of masonry beam. A numerical model of different coal pillar widths was established. The stress evolution characteristics of the coal column and roadway under the influence of mining was studied. The rationality of the top cutting parameters and the reinforcement and support scheme were verified. A mineral pressure monitoring system including the content of the monitoring of roadway surrounding rock deformation, roof off-layer monitoring, anchor rod (cable) force monitoring and the development monitoring of the internal cracks of the surrounding rock has been established. The results show that the top-cutting pressure relief scheme has successfully prefabricated the noncontinuous artificial weak surface. The stress state of the roadway surrounding rock has been optimized. The disturbance of coal pillar stress caused by rock covering movement is weakened.

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