500 m级超长引张线式水平位移计测量准确度研究

Research on Measurement Accuracy of 500 m-level Super Long Tensile Line Horizontal Displacement Meter

双江口水电站下游堆石区布设的引张线式水平位移计最大长度达560 m,超长引张线不均匀变形、沿程阻力引起的测量误差大,500 m级引张线式水平位移计在业界应用尚属空白。通过对500 m级超长引张线式水平位移计测量准确度影响因素分析,并开展现场模拟试验研究,提出了一系列结构优化方案及监测操作方法,确定了其在双江口300 m级高土石坝的适用性和最佳监测实施方案,可为今后500 m级引张线式水平位移计的设计和安装提供参考。

The maximum length of the tensile line horizontal displacement meter is 560m in the downstream rockfill area of Shuangjiangkou Hydropower Station.The measurement error of the meter caused by the non-uniform deformation and the resistance along the line is larger.The 500 m-level super long tensile line horizontal displacement meter hasn't been applied in practical hydropower engineering yet.Based on the analysis of the factors affecting the measurement accuracy of 500 m-level super long tensile line type horizontal displacement meter and the field simulation test research,a series of structural optimization schemes and monitoring operation methods are put forward.The applicability and the best monitoring plan of this displacement meter in the 300 m-level high earth-rock dam at Shuangjiangkou Hydropower Station is determined,which can provide a reference for the design and installation of the 500 m-level super long tensile line horizontal displacement meter in the future.