ESTIMATION OF SUBSURFACE STRUCTURE AROUND MINING GALLERY BY MEANS OF MULTI-COMPONENT SIGNAL PROCESSING OF DRILLING NOISE WHILE CORE-BORING

Abstract

Imaging technique by passive measurements of vibration has been developed in order to use for investigation and development in a high level nuclear waste disposal repository. The drilling-noise of core-boring was recorded in a mining gallery, and characterization of the signal was conducted with a room experiment. Because the obtained signal was low quality with cyclic noises, the signal processing techniques such as adaptive filtering and 3D hodogram analysis were applied. Finally, the imaging results were reasonably consistent with the geology estimated from rock core samples. This paper presents the possibility of utilization of various passive vibrations to image subsurface structure at very low cost.