2022 Volume 17 Issue 2 Pages 217-225
This paper revealed the relationship between the precision for displacement measurement and the slope length based on the measured displacement until failure in model slopes and natural slopes. Displacement interval and time interval were examined as the precision of the displacement measurement. Examination of the relationships between the displacement intervals normalized by the displacement until failure and the deviations from the normalized displacement interval to measured displacement clarified that the normalized displacement interval should be less than 0.05 for precise measurement of the displacement. The time interval normalized by the time until failure was also revealed to be less than 0.05 in the same way. Combining the relationship between the slope length and the displacement until failure to the normalized displacement interval indicated that the displacement interval should be less than 22 mm for the displacement measurement in the slope of the length less than 50 m on which the shallow landslide is expected to occur. Time interval was revealed to be less than 400 seconds for precise measurement of the displacement in the slope of less than 50 m.
