Roof strata control is crucial to production safety in underground coal mines. In this study, a
field trial was carried out involving large-scale hydraulic fracturing (LHF) to weaken strong …

Traditional methods of controlling hard roofs have a limited scope of action and cannot
effectively release the strong ground pressure behavior (SGPB) induced by high‐position …

Ground fracturing is a new and effective method for controlling high-level hard roofs. In
underground coal-seam mining, the maximum principal stress is horizontal stress, along …

Surface hydraulic fracturing of far-field hard roof is an effective mean to hard roof control, in
which determination of target stratum is the key. However, groundless selection without …

High mining-induced stresses can cause a series of problems related to the stability of
entries and pillars including roof fall, rib failure, floor heave, and even coal bursts. In extreme …

The high strength and large caving span of hard roofs results in a strong mine pressure
which is a major problem in roof control. Especially in the condition of extra thick coal seam …

Highlights What are the main findings? The 3D stress distributions around the gob after
mining are numerically calculated. What is the implication of the main finding? The …

In extra-thick coal seams, mining operations can lead to large-scale disturbances, complex
overburden structures, and frequent and strong strata behavior in the stope, which are …

The presence of hard roof poses a significant threat to the safety of underground coal
mining. In this study, a mechanical model is established for underground stopes to analyze …

Fully mechanized top-coal caving mining with high mining height, hard roofs and strong
mining pressure are popular in the Shendong mining area, China. The occurrence of …