Monitoring of Rock Slope Stability by the use of high Sensitive Tiltmeter

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Stability monitoring of rock slope is important for safety working of open cut mine.In this research project, a monitoring system of rock slope stability by the use of high sensitive tiltmeters has been proposed.(1) High sensitive tiltmeters were installed in a limestone mine and long term measurement has been performed. Analyzing the time series of tilt in rock mass, it is clarified that the cover rock of the slope is moving to downward and this moving is caused by the frictional sliding on the geological discontinuity between cover rock and base rock. From this result, it is confirmed that high sensitive tiltmeter is useful to monitor the rock slope stability.(2) A method to estimate the elastic moduli of rock mass using the earth moving as loading source has been proposed. By applying it to Shiriya mine, Young modulus and Poiison's ratio of rock mass in the present field were estimated to be lOGPa and 0.1, respectively.(3) A scheme to estimate the global stress state from the local stress state evaluated by the field stress measurement has been proposed. By applying it to Torigatayama mine, it is made clear that, in this region, the stress state induced by the horizontal movement of the upper crust is nearly uniaxial compression.