2015
DOI: 10.1016/j.tust.2015.06.012
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Excavation cycle times recorded during sinking of a deep shaft in crystalline rock – A case example at Ventilation Shaft of Mizunami URL, Japan

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“…It was found that the orientation of the major in situ principal stress is between N26°W and N35°W in the horizontal plane. e shaft was excavated using short rounds of full-face drilling and blasting, which is an approach that is widely used for shaft sinking [41]. e advance length in each excavation round was set to 4.0 m, and each excavation cycle took about 24 hours.…”
Section: Case Study Project Descriptionmentioning
confidence: 99%
“…It was found that the orientation of the major in situ principal stress is between N26°W and N35°W in the horizontal plane. e shaft was excavated using short rounds of full-face drilling and blasting, which is an approach that is widely used for shaft sinking [41]. e advance length in each excavation round was set to 4.0 m, and each excavation cycle took about 24 hours.…”
Section: Case Study Project Descriptionmentioning
confidence: 99%