Laserfiche WebLink
Figure 3. Estimated Gateroad Pillar Loads From Mining First Adjacent Panel. <br />After narrower pillar yields and transfers all possible load onto wider rigid pillar. <br />Estimated LTD is 329 feet. <br />90 ft~ Load Transfer Distance (LTD} <br />~ ~r ~,~• <br />~ // ~/,/ <br />I ~ fi/ <br />I // // <br />~ ~ <br />~ / /gel <br />i / / 5ca <br />~ / /o,~tio <br />i / / `' <br />~ ~ / / ~~r <br />~ ~ Qa~a~o° Area Below Arch Represents Load on Gob <br />~ ~ That Cannot Be Transferred To Gateroad Pillars <br />~ / <br />// / <br />I ~` ~ ~ <br />/ / <br />~~ / / <br />~ ~ <br />.~ 20ft ~ <br />Estimated rigid pillar design load on 80-ft wide by 180-ft long pillar for 160 PCF overburden is 4,792,000 tons and average pillar <br />stress is 4620 psi. Estimated minimum yield pillar load for 30-ft wide by 80-ft long pillar is 600,000 tons and average pillar <br />stress is 3470 psi. <br />