滑坡变形特征的GPS监测信息识别研究

Identification of GPS Monitoring Information of Landslide Deformation Characteristics

在滑坡监测预警工程广泛实施下,对监测信息的有效识别与运用是滑坡监测工作的重要研究内容。对三峡库区大量滑坡的地表GPS位移监测信息分析后得出,在库水作用下部分滑坡累积位移-时间曲线具有强烈的波动性,平面运动轨迹与勘察主滑方向存在较大差异,提出单从滑坡累积位移或将位移矢量投影到主滑方向来研究滑坡稳定性与预测预报,会产生很大误差。通过FLAC3D三维数值模拟对三峡库区某滑坡的位移矢量变化特征进行了模拟,结果表明通过分析监测点在不同工况下位移矢量变化情况来研究滑坡变形特征,能够很好地反映滑坡监测点的真实运动轨迹,对滑坡监测资料分析具有借鉴意义。

With the implementation of landslide monitoring and early warning project, effective identification and u- tilization of monitoring information is becoming a key research issue in landslide predictions. It＇ s found that cumu- lative displacement-time curve of partial landslide fluctuates strongly under the action of reservoir water, and great differences exist between plane motion trajectory and main sliding direction. As a result, errors would occur in the results of landslide stability and prediction by analyzing cumulative displacement or projecting displacement vector onto the main sliding direction. The variation features of displacement vector of Jiaojiawan landslide in Three Gorges Reservoir area is simulated by FLAC3D. The results show that the real motion trajectory of landslide monitoring points can be reflected by analyzing the variation features of displacement vector. This research would be referential for the analysis of landslide monitoring data.