Dam & Safety ›› 2023, Vol. 0 ›› Issue (1): 30-32.

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Calculation of effective aperture of plumb line hole by the circle graphic method

YU Shengli, KE Chuanfang and DUAN Hang   

  1. China Three Gorges Construction Management Co., Ltd.
  • Received:2020-03-30 Online:2023-02-10 Published:2023-04-18

“逐圆图解法”计算垂线孔有效孔径

于胜利，柯传芳，段 杭   

  1. 中国三峡建设管理有限公司，四川 宁南，615421
  • 作者简介:于胜利（1974—），男，山东潍坊人，高级工程师，主要从事变形监测工作。

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Abstract:

The plumb line hole is often set in the dam deformation monitoring system. The relevant standard requires that the effective aperture shall not be less than 75 mm after the installation of protective pipe in the plumb line hole. Therefore, the position of circle center on each elevation in protective pipe should be measured in time to calculate whether the effective aperture meets the requirement, and the center coordinates of the effective circle should be determined. Based on simulation analysis of intersection of two circles, the circle graphic method is proposed to calculate the effective aperture, and the corresponding formulas are given. In addition, the calculation results of this method and other methods are compared. On one hand, the reliability of this method is checked. On the other hand, it is concluded that there is no unique solution for the effective aperture in plumb line hole.

Key words: safety monitoring, plumb line hole, effective circle, effective aperture, graphic method

摘要：

大坝变形监测系统中常设置垂线孔，相关标准要求垂线孔安装保护管后，管内有效孔径不小于75 mm，因 此应及时测量保护管内各高程圆心所在位置，以计算有效孔径是否满足要求，并确定该孔径对应的有效圆圆心坐 标。基于两圆相交模拟分析，提出“逐圆图解法”计算有效孔径，并给出相应算式。此外，就相同数据对比了其他 方法的计算结果，一方面校核“逐圆图解法”的可靠性，一方面得出了垂线孔内有效孔径并无唯一解的结论。

关键词: 安全监测, 垂线孔, 有效圆, 有效孔径, 图解法

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