CALIBRATION METHOD AND DEVICE FOR MEASURING SATURATION OF GROUND

摘要

PROBLEM TO BE SOLVED: To provide a calibration method and a device which enable a high-precision measurement to be achieved in measuring saturation of the ground on the basis of specific resistance of sand ground with air injected thereinto.SOLUTION: A calibration method obtains a relation between saturation and specific resistance by: filling a sample of the ground G in a container 2 which can be sealed and has two conducting electrodes 7 arranged with a distance in between as well as detection electrodes 8a to 8e separately arranged in the distance between the two conductive electrodes 7; bringing the sample of the ground G to have saturation of 100% by filling water in the container 2 through a water supply pipe 5 while deaerating the container 2 through a suction pipe 6; sequentially reducing the saturation by draining water from the container 2 through the water supply pipe 5; detecting voltages between the detection electrodes 8a to 8e, at respective saturation, by voltage detection means 11 with an electric current applied to the conducting electrodes 7 by conducting means 10; and calculating the specific resistance of the sample of the ground G by calculation means 12 on the basis of the electric current as well as the voltages.