A long wall panel 1,900mlong with a face length of 250mis planned for a seam 396m deep and 5.0 m thick. Mining is full seam height. Assume UK conditions apply. Find (in m when):

1 The maximum subsidence that will develop during the life of the panel.

2 The maximum subsidence after the face has progressed 158 m.

3 Peak strains: E+, E−, e.

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 25 m directly below the first panel.

7 Assuming US 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.