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List of products by author: S. Yagi
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Application of a Rapid Non-Core Drilling Exploration Ahead of the Tunnel Face using Water-Powered Hammer Drilling on...
Abstract: Generally speaking, in order to survey the geological conditions existing ahead of the face, tunnel excavation must be discontinued temporarily, and therefore it is necessary to bore over a long distance in as short a time as possible. To overcome these requirements, we have developed an exploration system with a water-powered hammer of down-the-hole drilling type, which is capable of surveying...
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