podbierane i nadbierane
English translation: undermined and overmined
| 02:08 Aug 22, 2010 |
| Polish to English translations [PRO] Tech/Engineering - Mining & Minerals / Gems | |||||||
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|  Selected response from: geopiet | ||||||
Grading comment
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| 2 | undermined and overmined |
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| Podział złóż węgla na poziomy. - |
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Answers
7 hrs confidence: 
undermined and overmined Explanation: 1. Undermining – This situation represents classic top-down multiple seam mining. The upper seam is mined first and abandoned, prior to mining the lower seam. Gob-solid boundaries, barrier pillars, pillar remnants or other structures left over from full extraction mining in the upper seam may cause adverse stress concentrations in the lower seam. 2. Overmining – This situation represents classic bottom-up multiple seam mining. Full extraction mining in the lower seam causes the upper seam to fully subside prior to its development. In addition to stress concentrations due to pillar remnants or gob-solid boundaries in the lower seam, the upper seam and surrounding rock may suffer damage from subsidence-induced displacement and fracture http://www.cdc.gov/niosh/mining/pubs/pdfs/fmoms.pdf - page 2 ------------------ http://www.cdc.gov/niosh/mining/pubs/pdfs/uscho.pdf -------------------------------------------------- Note added at 7 hrs (2010-08-22 09:47:13 GMT) -------------------------------------------------- Stability analysis for a portal and mains in a virgin reserve undermined and overmined within 100 feet to 200 feet respectively, Harlan County, Kentucky. - http://www.ame-geolab.com/Representative Projects.htm |
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Reference comments
6 hrs |
| Reference: Podział złóż węgla na poziomy. - Reference information: podbieranie głównych wyrobisk wyższego poziomu poprzez prowadzenie eksploatacji na poziomie niższym |
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