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The excavation method in large underground cavity construction
The excavation method in large underground cavity construction
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机译：大型地下洞室施工中的开挖方法
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摘要
PROBLEM TO BE SOLVED: To minimize the displacement of a cavity accompanying excavation by excavating a block penetrating through the central part in advance, constructing side blocks zigzag on both sides thereof by block construction, and performing the excavation of a side wall finish part by breaker excavation. SOLUTION: A central block 20 penetrating through the central part is first excavated in advance. Side blocks 21 on both sides of the central block 20 are constructed zigzag by block construction. Namely, the excavation of a slant line part is performed in order of 1→4→5→9 every block. The excavation of a blanked part is then performed in order of 3→6→7→10. A breaker excavation by a breaker is performed after the side block excavation. Thus, a wide space is effectively utilized to improve safety, and excavation quantity per day can be increased since a number of facings are provided.
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