Quantification of Slope Movement Using Time Domain Reflectrometry-An Experimental Trial

Abstract

Time Domain Reflectometry (TDR) is gaining widespread attention as a cost-effective method to monitor mass movements in both soil and rock. It has been used successfully for a number of years to monitor deep-seated failures in soil deposits and for monitoring many different kinds of movements in rock masses. A chief benefit of using this technology is that it can be a cost effective means of remotely monitoring the effectiveness of slope hazard remediation measures. TDR cannot determine the actual amount of movement. In this paper, laboratory results of an experiment using opencast mine model with two types of coaxial cables indicated a relationship between the reflection coefficient and the shear displacement. Increase in the deformation was proportional to the reflection coefficient. reflection coefficients were 0.93 to 0.98 for RG6 coaxial cable, for displacement of 0 to 7 mm in the model. Attempts are being made to implement the above TDR system of slope monitoring in the opencast mines in India as part of Ministry of mines, Government of India(GOI) sponsored project