Multi‑strata hydraulic fracturing via surface vertical wells for rockburst mitigation in an extra‑thick coal seam under a protective layer: a case study
In extra-thick coal seams under a protective layer, the advanced coal mass (ETUPAC) may experience stress recovery and even abnormal concentration after a prolonged mining cessation, leading to rockburst occurrences under strong mining-induced tremors. In this study, a 'combined cantilever + voussoir beam' overburden s...