2008-01-16_APPLICATION CORRESPONDENCE - C2008086 ‎(2)‎

• Permit No: C2008086
• IBM Index Class Name: Application Correspondence
• Doc Date: 1/16/2008
• Doc Name: Preliminary Draft Environmental Impact Statement/Subsidence Figures 1 to 15
• Media Type: D
• Archive: No

Theoretical design loads and stresses on rigid and yield pillars after passage of second adjacent panel.
Estimated LTD is 329 feet. Estimated LTD is 329 feet.
Load Transfer Distance (LTD) 80 ft Load Transfer Distance (LTD)
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Area Below Arch Represents Load on Gob s~ , ~' ~' ~ ~Qa Area Below Arch Represents Load on Gob
That Cannot Be Transferred To Gateroad Pillars ~~ ~ i ~ j That Cannot Be Transferred To Gateroad Pillars
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.1 20ft 1
Estimated minimum rigid pillar design load on 80-ft wide by 180-ft long pillars for 160 PCF overburden is 7,184,000 tons and average pillar stress is 6930 psi. Estimated minimum yield
pillar load is
600,000 tons and average pillar stress is 3470 psi.