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Keywords: excavation section
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Proceedings Papers

Paper presented at the ISRM International Symposium - 2nd Asian Rock Mechanics Symposium, September 11–14, 2001
Paper Number: ISRM-ARMS2-2001-143
... of the excavation section. For two-layer excavation. two rows of shafts arc respectively arranged along the center line of the upper and lower excavation sections. For three-layer excavation, two rows of shafts are respectively arranged along the center line of the middle and lower excavation sections. Transverse...

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