Resolution for measuring displacement to detect collapse in a sandy model slope

Abstract

This paper examines an appropriate interval measuring surface displacement and elapsed time to a slope failure using data measured in a large sandy slope under artificial rainfall. We compared the reproducibility by comparing a time-displacement curve of original data with that of thinned out data in different time and/or displacement. When intervals measuring surface displacement make less than 5% of total surface displacement to the slope failure, the reproducibility of original data becomes high. Similarly, high reproducibility is provided by making time intervals measuring the slope failure time less than 5% of total time to slope failure. These results imply that the adequate measurement accuracy depends on the displacement amount and time until failure and it is necessary to choose a monitoring device corresponding to the measurement accuracy.