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

岩质边坡稳定性监测对露天矿安全生产具有重要意义。本课题提出了一种利用高灵敏度倾斜仪监测岩质边坡稳定性的系统。(1)在石灰石矿山安装了高灵敏度倾斜仪，并进行了长期测量。通过对岩体倾斜时间序列的分析，可以看出边坡的盖层在向下移，这种下移是由于盖层与基岩之间的地质不连续面发生摩擦滑动造成的。由此验证了高灵敏度倾斜仪在岩质边坡稳定性监测中的应用价值。(2)提出了一种以土移为加载源估算岩体弹性模量的方法。将其应用于石梨矿，估算出该矿区岩体杨氏模量为lOGPa，泊松比为0.1。(3)提出了一种由应力场测量得到的局部应力状态估计整体应力状态的方案。通过对Torigatayama矿的应用，明确了该地区上地壳水平运动引起的应力状态为近单轴压缩。

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.