| 摘要 |
PROBLEM TO BE SOLVED: To investigate a situation in the vicinity of a bolt tip desired most to be investigated, while avoiding an disturbance due to a rock volt drilled into the ground. SOLUTION: In this underground radar survey method, an electromagnetic wave Ew of prescribed frequency is emitted from a transmission antenna SA arranged on a ground surface GS, into the ground G, and an underground reflected wave Grw reflected with the electromagnetic wave Ew emitted into the ground G, in a reflection point in the ground G, is received by a reception antenna CA arranged on the ground surface GS, a visualization data of underground structure is composed based on a received reflection time and a waveform indicating an intensity of the reflected wave to from an image. At least one of the transmission antenna SA and the reception antenna CA is brought into contact with a base end of the rock bolt RB implanted in the ground G, and at least one of the transmission of the electromagnetic wave Ew and the reception of the underground reflected wave Grw is carried out via the rock bolt RB, in the underground radar survey method. COPYRIGHT: (C)2008,JPO&INPIT
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