Application test of rock fall detection system using steel wire cable sensor and mobile multimedia network for a cropped slope

摘要

According to some researches on the monitoring of a slope failure, frequency of various scale rock fall tends to increase just before a big failure. The authors propose the frequency monitoring of small rock falls as a useful way to predict large-scale rock falls or slope failures. In this study, practical applicability of the rock fall detection system using steel wire cable sensor and satellite phone was earried out. The proposed system is able to transmit the measured rock fall signals to a remote office. The rock fall frequency and the rock fall source could be evaluated, even when the steel wire cable sensor was stretched on the cropped slope having no net, which made easy the propagation of the rock fall impact. It was confirmed that rock fall characteristics, such as the falling velocity, could be evaluated through analysis of the data registered by the field side personal computer. As a result of composition study of measured waveforms, it was concluded that stretching interval of steel wire cable sensors could be increased up to 10 million without deterioration of the detection abilities.