6
Figure 9. Element safety factor distributions at the bottom
of the shaft in Oil Shale using laboratory rock properties
(A) and jointed rock properties (B) after excavating 500 ft
upwards from the mining horizon. Gray elements are
excavated and shaft diameter is 26 ft (7.9 m). Black circles
are safety factor contours at an interval of 0.5
Figure 10. distribution of element safety factors in a vertical
section after complete shaft excavation (not to scale)
Figure 9. Element safety factor distributions at the bottom
of the shaft in Oil Shale using laboratory rock properties
(A) and jointed rock properties (B) after excavating 500 ft
upwards from the mining horizon. Gray elements are
excavated and shaft diameter is 26 ft (7.9 m). Black circles
are safety factor contours at an interval of 0.5
Figure 10. distribution of element safety factors in a vertical
section after complete shaft excavation (not to scale)