Multi-Method Synergistic Determination of the Development Height of the Water-Conducting Fractured Zone in the 82209 Working Face

Why It Matters

Accurate zone height prediction reduces water‑inrush risk, protecting personnel and equipment while optimizing mine ventilation and drainage planning.

Key Takeaways

• Empirical formulas gave 56–135 m range.
• Key‑strata theory predicted 66.9 m height.
• Borehole measurements: 64.5 m and 113.6 m.
• Simulation max height 120.12 m, error 1.36‑4.56 %.
• Multi‑method approach validates water‑zone prediction.

Pulse Analysis

The mining industry has long grappled with the uncertainty of water‑conducting fractured zones that develop when overburden strata fracture during coal extraction. Traditional reliance on single empirical formulas often produces divergent estimates, as seen in the 82209 working face where predictions spanned from 56 to 135 metres. By layering key‑strata theory, which isolates hard‑rock layers and calculates break spans, engineers achieved a more focused forecast of 66.9 metres, narrowing the uncertainty window and providing a clearer target for field verification.

Field verification through surface boreholes added a critical reality check, revealing a lower measurement of 64.52 metres at one location and a higher 113.58 metres at another. These discrepancies underscore the spatial variability of fracture propagation, influenced by local geology and mining advance. Numerical simulation bridged this gap, modeling the progressive advance to 360 metres and projecting a peak fractured‑zone height of 120.12 metres. The simulation’s error margin of just 1.36‑4.56 % against borehole data validates its predictive power, offering a repeatable method for similar near‑horizontal seams.

The multi‑method synergistic framework delivers a robust, cross‑validated solution that can be embedded into mine safety protocols. By integrating empirical, theoretical, observational, and computational techniques, operators gain confidence in water‑inrush risk assessments, enabling proactive drainage design and emergency response planning. This holistic approach not only safeguards workers but also enhances operational efficiency, reducing downtime and costly water‑related incidents across the coal mining sector.