Study on the Layout Form of Comprehensive Mining Working Face with Existing and Abandoned Natural Gas Wells in Coal Mines

Tianyu Dong

doi:10.54097/m30brf10

Authors

Tianyu Dong

DOI:

https://doi.org/10.54097/m30brf10

Keywords:

Cross Mining; Numerical Simulation; Ground Pressure Manifestation; Roof Deformation.

Abstract

The safety issues caused by the phenomenon of overlapping mining in China's mineral resource overlap areas are becoming increasingly prominent. Taking the example of the Shen 30 well (natural gas drilling) within the 5-20111 working face of the Qinglongsi Coal Mine, a study was conducted on the effects of the relative positions of the working face and natural gas drilling on the advancement of the working face. This study is of significant importance for the safe exploitation of overlapping mineral resources. Utilizing the advantages of numerical simulation, numerical models with different relative positions of natural gas drilling and the working face were established to investigate the effects of natural gas drilling at different locations on the displacement and deformation patterns of the working face's roof and the impact on the drilling and floor during the advancement of the working face. The results indicate: (1): As the drilling moves away from the central position of the working face, the high roof displacement area gradually disappears, with the minimum deformation of the roof occurring when the natural gas drilling is located in the middle left position of the working face. (2): Within a range of 80m below the working face floor, the rock within a 0.3m range around the drilling will undergo damage. When the working face moves 14m away from the drilling, both the sealing material inside the drilling and the surrounding rock will undergo yielding damage in the roof.(3): The maximum working resistance of the hydraulic support in the working face is approximately 43.8MPa, with a periodic advance spacing of about 10m to 15m, an average periodic advance spacing of about 12m. When the working face is close to and slightly away from the Shen 30 well, the average periodic advance spacing increases slightly to 14m, and the working resistance of the hydraulic support also reaches a maximum of 43.8MPa. As the working face continues to advance, the average periodic advance spacing returns to around 12m.

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