Huai-Qian Liu

Fracture propagation and permeability enhancement mechanisms induced by near-roof hydraulic fracturing in soft coal seams

Soft and low-permeability coal seams are prone to borehole collapse, unstable gas-extraction pathways, and a restricted stimulation range when conventional in-seam fracturing is applied. To overcome these limitations, this study proposes a near-roof hydraulic-fracturing strategy. Coal–immediate-roof assemblages from He...