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An approach to evaluate the slope stability by the combination of field displacement measurement and numerical stress analysis is presented.The deformation behavior of rock slope due to excavation has been analyzed by Boundary Element Method and the characteristics of the displacement field induced by bench cut excavation has been clarified. It is pointed out that the pre-calcuration is useful to select the field measurement system for the monitoring of the slope stability.The relative displacement in rock mass has been measured in a open cut limestone mine by the use of the multi-channel-extensometer.Young's modulus of rock mass and the initial stress state in the present field have been estimated by analyzing the relative displacement induced by the excavation of one bench. Using these results, the relative displacement along the measuring line has been predicted. Comparing observed values with predicted ones, it is concluded that the rock slope is stable at present.

Stability Assesment of Rock Slope by Displacement Measurement.