基于三角形试验的引张线卡阻位置定位分析

引张线广泛应用于大坝水平位移监测,但在长期运行过程中会因线体卡阻而影响观测成果的真实性。因引张线的护管为不透明的PVC管或镀锌管,直接观察引张线卡阻部位存在一定难度,更换整根护管也显得不经济。为经济有效地消除卡阻,介绍运用三角形试验来准确判定卡阻位置的方法,并给出了相关计算公式。工程实例验证表明,该方法可准确找到卡阻位置,为以后引张线卡阻问题处理提供了参考。

Positioning analysis of extension line obstruction location based on triangle test

The extension line is widely used in dam horizontal displacement monitoring, but obstruction would occur in long-term operation and may affect the authenticity of observation results. Generally, as the protective pipe of extension line is opaque PVC pipe or galvanized pipe, it is difficult to directly observe the obstruction location, and the complete replacement of protective tube is not economical. In order to economically and effectively eliminate the obstruction, the method of using triangle test is introduced and the relevant calculation formula is given. The engineering practice shows that this method can accurately find the obstruction location, which provides reference for extension line obstruction in other project.