Tunnel heading front geological features inquiry method and

摘要

PROBLEM TO BE SOLVED: To conduct a geological survey of the boundary surface accurately by transmitting a radar signal from the surface of the cutter face of a shield machine, superposing and processing reflected waves from the inside of the ground at a large number of times and removing noises. ;SOLUTION: An antenna 3 for reception and transmission in combination for an electromagnetic radar or an antenna for transmission and an antenna for reception are arranged on the surface of a cutter face 2 for a shield machine 1, and the radar signals of electromagnetic pulses are transmitted to the front of an excavated facing surface at fixed time intervals. Reflected waves from the inside of the ground are received, and input to a computer through an electromagnetic radar body, and the waveforms of receiving waves at a large number of times are superposed and processed and a composite receiving waveform is acquired. Noises generated at random places are weakened by superposing processing, reflected waves from a stratum boundary surface 6 existing even in any receiving wave are intensified, and the stratum boundary surface 6 can be surveyed accurately.;COPYRIGHT: (C)1998,JPO