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Behaviors of overlying strata in extra-thick coal seams using top-coal caving method

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Figure

Fig. 1. Deformation of the roadway and safety valves of hydraulic support in field.
Fig. 3. Columnar section between two coal seams obtained from borehole No. 1204 and associated strata
Fig. 7. Two-dimensional (2D) inversion of strata resistivity monitored by the measuring line No
Fig. 9. Profile of working face in the dip direction.
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