基于GPS技术的滑坡动态变形监测试验结果与分析

Experiment Results and Analysis of the Dynamic Deformation Monitoring of a Kind of Landslide Based on GPS Technology

结合某类滑坡的大型物理模型试验,在滑坡体上布设了若干监测点,并用GPS单历元定位技术和RTK技术对该滑坡体进行了连续实时监测。通过对该滑坡从开始滑动至产生破坏全过程监测数据的处理与分析,以及将GPS监测结果与全站仪三维监测结果的对比,发现在观测条件较好和基线较短时,基于Track模块GPS单历元定位技术监测滑坡变形的平面精度在5mm左右,高程精度约为9mm;RTK定位技术的平面精度在11mm左右,高程精度约为17mm;而用小波变换等方法进行滤波后的精度还会更高。

Some monitoring points were set on the landslide body and GPS single epoch positioning and RTK methods were used to monitor the landslide with real time combined the big physics model experiment of one kind of landslide.Through the processing and analysis on monitoring data of the landslide from start slipping to breaking down and the contrast of monitoring results of GPS and total station,it is detected that the precision on plane and height of GPS single epoch positioning based on Track is about 5 mm and 9 mm,the precision of RTK is about 11mm and 17mm when the observation conditions are favorable and the baseline is short,and the results after filtered by wavelet transformation or other methods are more higher.At the same time,the experiment data are also displayed that the mean differences of monitoring results obtained by GPS single epoch positioning and RTK on the same epoch are 5mm and 11mm respectively in the direction of plane and height.Those phenomena showed that the monitoring results of GPS single epoch positioning and RTK are accordant preferably,and they all can be used to monitor the dynamic and real time deformation of this kind landslide.The key parameters obtained by this experiment can provide important technique references for the study on deformation monitoring and forecast of this kind landslide.