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It is necessary to investigate the existance of obstacles or geological structure in front of a shield tunneling machine, especially in case of tunneling under the urban area or sea-bed. Accordingly, some field experiments were carried out for the purpose of developing a monitoring system regarding obstacles in front of the machine. Tow methods which use an acoustic wave and Rayleigh wave respectively, were examined. As a result, both methods were proved to be useful for detecting obstacles in size of 40cm in diameter or more and exist in the maximum range of 7-10m. Joint application of the both methods is expected to improve the reliability of the judgement.

EXPERIMENTAL STUDIES ON MONITORING OBSTACLES IN FRONT OF A SHIELD TUNNELING MACHINE USING AN ACOUSTIC WAVE AND RAYLEIGH WAVE