A long wall panel 6,200 ft long with a face length of 820 ft is planned for
Question:
A long wall panel 6,200 ft long with a face length of 820 ft is planned for a seam 1,300 ft deep and 16.5 ft thick. Mining is full seam height. Assume UK conditions apply. Find:
1 The maximum subsidence that will develop during the life of the panel.
2 The maximum subsidence after the face has progressed 520 ft.
3 Peak strains: Et, Ec, ec.
4 The width of a barrier pillar needed to protect a ventilation shaft that serves the mine.
5 The maximum subsidence after mining four identical panels adjacent to the first panel and trough width.
6 The maximum subsidence and trough width after mining an identical panel 80 ft directly below the first panel.
7 Assuming Utah conditions with a subsidence factor of 0.65 and an angle of draw of 28◦, find the maximum subsidence and trough width for a single panel.
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