| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of efficiently excavating an adit and efficiently crushing a bedrock of an excavation object section every area partitioned with a groove by extending to the running direction of excavation in the adit and to the direction at a right angle to the running direction of excavation to form a free surface of the inside of the groove partitioning an excavation object section or a part of the excavation object and, at the same time, by electrically discharging in a discharging hole by providing the discharging hole in the area partitioned with the groove. SOLUTION: The free surface 3 extending to the running direction of excavation in the adit and the direction at a right angle to the running direction of excavation is formed in the excavation object section 51 for the adit and, at the same time, the discharging hole 11 extending to the running direction X of excavation is formed, a discharging electrode 70 is provided in the discharging hole 11, an impulsive wave is generated by electrical discharge in a discharge section 79 of the discharging electrode 70, and the excavation object section 51 between the discharging hole 11 and the free surface 3 is crushed by the impulsive wave to excavate the adit. COPYRIGHT: (C)2006,JPO&NCIPI
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