ABSTRACT

Principally where movement is occurring, where safety factors against sliding are low, or where a major work would become endangered by a slope failure, instrumentation is required to monitor changing conditions and provide early warning of impending failure. Slope stability analysis is far from an exact science, regardless of the adequacy of the data available, and sometimes the provision for an absolutely safe slope is prohibitively costly. In cut slopes, instrumentation monitors movements and changing stress conditions to provide early warning and permit invoking contingency plans for remedial measures when low safety factors are accepted in design. In an unstable or moving slope, instruments were installed to locate the failure surface and determine pore water pressures for analysis, and to measure surface and subsurface movements, velocities, and accelerations which provided indications of impending total failure. In this research, the factors affecting the instability of the slope, the solution for stabilization of the slope, behavioral variation of sliding, the necessity of behavior measurement of the slope movements and investigation of the various tools related to the slope are briefly introduced and their performance and also the method of measurement and the general points related to interpretation of the monitoring data have been presented.

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