Gas permeability characteristics of the hanging wall and footwall in normal faults based on true triaxial experimental system
Weihua Song, Luo Yan, Huice Jiao
TL;DR
This study examines how normal faults affect coal seam permeability at different depths, helping improve gas extraction and safety in deep mining.
Contribution
The study introduces true triaxial experiments to analyze gas permeability differences in hanging wall and footwall coal seams of normal faults.
Findings
Permeability decreases exponentially with increasing confining pressure.
Hanging wall permeability is consistently lower than footwall permeability, with the difference increasing with depth.
Post-fracturing permeability increases more in the footwall compared to the hanging wall.
Abstract
In deep mining environments, normal fault structures significantly influence coal seam permeability, which plays a crucial role in coal and gas outbursts. Utilizing a true triaxial multifunctional physical simulation system, this study conducted gas seepage and hydraulic fracturing experiments on normal fault-associated coal seams at depths of − 400 m, − 600 m, and − 800 m. The research systematically investigates the gas permeability evolution in hanging wall and footwall coal seams of normal faults and proposes enhanced control measures tailored to the Guodishan normal fault. The results showed: Permeability exhibited a negative exponential relationship with confining pressure. As confining pressure increases, the permeability disparity between the hanging wall and footwall diminishes. Under true triaxial conditions, the permeability of the coal in the hanging wall of the normal fault…
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Taxonomy
TopicsCoal Properties and Utilization · Rock Mechanics and Modeling · Methane Hydrates and Related Phenomena