Setting the plural courses of traverse where length

摘要

PROBLEM TO BE SOLVED: To facilitate the prediction of breakage and collapse of ground and enhance the reliability of the prediction. ;SOLUTION: Two or more profile lines differed in length are set in a prediction subject area GA where the ground is predicted to be unstable, electrodes 1 are set on both sides thereof, and the ground potential difference is measured between the electrodes 1 and 1, respectively. The measured ground potential difference data are recorded every fixed time by a data logger 2, and transmitted to a personal computer 7 set in an observation station or the like through a data transmitting means 3, where necessary processing such as noise removal or the like is performed to evaluate a collapse or breakage precursory phenomenon of the ground of the area GA.;COPYRIGHT: (C)2003,JPO