土石坝GNSS监测水平位移与库水压荷载建模分析  

Analysis of modeling of GNSS monitored horizontal displacement and water pressure load of earth-rockfill dam

作　　者：张伟[1] 李陶[1,2] 何金平 陈德忠[1] 叶世榕[1] ZHANG Wei;LI Tao;HE Jinping;CHEN Dezhong;YE Shirong(GNSS Research Center,Wuhan University,Wuhan 430079,China;Collaborative Innovation Center of Geospatial Technology,Wuhan 430079,China;School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉430079 [2]地球空间信息技术协同创新中心,武汉430079 [3]武汉大学水利水电学院,武汉430072 [4]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《测绘科学》2019年第2期171-176,共6页Science of Surveying and Mapping

基　　金：水利部公益性行业科研专项经费项目(201401072);国家自然科学基金项目(41674032)

摘　　要：为揭示水库水位变化与土石坝表面位移的关系并建立相应的模型,该文收集了茜坑水库主坝体上下游多个监测点近半年的GNSS监测数据,通过解算短基线获取了各测站毫米级精度水平位移序列。结合坝体结构和水库水位监测结果,分析了库水位变化产生的面板水压荷载变化与监测站水平位移变化序列之间的关系。基于两者正相关特征,推导了水压载荷与监测点水平位移变化间简化的线性模型,并利用实测数据和最小二乘方法估计了模型参数。拟合结果表明,该模型较好地反映了水库调水期间,监测点水平位移的趋势和规律。To reveal the relationship between water level variation and earth rockfill dam surficial displacement,and construct a relevant model,five months of GNSS data from monitoring stations in the key dam of Xikeng reservoir was collected in this paper,with which horizontal displacement series in millimeter level precision were achieved.Combining with dam structure and water level data,correlation between horizontal displacement and water level data was analyzed.Considering this highly positive correlation,a simplified linear model between water pressure load and horizontal displacement was inferred,and the model parameters were estimated with GNSS and water level data by least square method.Fitting results showed that the horizontal displacement of these monitoring stations could be well reflected with the model and water level data.

关 键 词：土石坝 全球卫星导航定位系统 变形监测 水平位移 库水位 

分 类 号：P228.4[天文地球—大地测量学与测量工程] TV698.1[天文地球—测绘科学与技术]