(2) The special drilling structures, stepwise gradient pressurization, and segmented sequential downward grouting technique are proposed to ensure the grouting effect under goaf. (3) Finally, the ...

However, extensive coal mining has left behind Goaf areas underground voids and fractured zones that pose serious safety hazards and environmental risks. These challenges require innovative approaches ...

However, extensive coal mining has left behind Goaf areas underground voids and fractured zones that pose serious safety hazards and environmental risks. These challenges require innovative approaches ...

After coal seam extraction, stress in the overburden redistributes. When the overburden exceeds its bearing capacity, it fractures, generating mining-induced fractures and creating a symmetrical ...

School of Civil Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, P R China College of Environment, Shenyang University, Shenyang, Liaoning 110044, P R China ...