Author(s)

Fengfeng Yang, Jufeng Zhang, Chao Zheng, Shuang Li and Dongfang Gao

Corresponding Author

Fengfeng Yang

ABSTRACT

When measuring gas pressure in high-pressure gas-containing coal bodies, the quality of sealing pores plays a decisive role in the determination results, and the selection of reasonable grouting pressure during sealing is particularly important. Aiming at the deficiencies in the current grouting pressure research, based on the range of plastic zone, a slurry permeability diffusion model under multi-field coupling was established. According to the theoretical model created, the law of slurry diffusion under different grouting pressures was analyzed, and the reasonable grouting pressure was verified by gas pressure measurement results. The field test results show that the 5MPa grouting pressure simulated by this model is reasonable and can be consistent with the in-situ grouting effect.

KEYWORDS

Percolation grouting, gas-bearing coal, grouting pressure, numerical simulation, coupling effect