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基于PPP-BOTDA的泵站进水流道钢模板施工期变形监测研究
包腾飞1, 张兰兰2, 胡雨菡1, 王一兵1, 李涧鸣1
1.河海大学 水利水电学院;2.绍兴市水利水电勘测设计院有限公司
摘要:
在泵站施工过程中,加强对进水流道钢模板的变形监测对保障泵站安全运行具有重要意义。针对传统变形监测方法难以适用于复杂异形曲面和易受环境因素制约等不足,本文基于预泵浦布里渊光时域分析技术(PPP-BOTDA) 提出了一种泵站流道钢模板施工期变形监测方法。首先提出了一种温度补偿方法以解决布里渊频移对温度和应变交叉敏感的问题,然后采用改进共轭梁法将温度补偿后的应变监测值转换为结构变形。该方法成功应用于某排水泵站工程流道钢模板变形监测。监测结果表明,钢模板顶部和两侧均监测到拉应变和变形,测值均随混凝土浇筑逐渐增加,并在浇筑完成一段时间后趋于稳定。
关键词:  变形监测  分布式光纤传感  预泵浦布里渊光时域分析  温度补偿  泵站
DOI:
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Deformation Monitoring of Steel Templates for Suction Boxes of Pumping Stations during construction based on PPP-BOTDA
Bao Tengfei1, Zhang Lanlan2, Hu Yuhan1, Wang Yibing1, Li Jianming1
1.College of Water Conservancy and Hydropower Engineering,Hohai University;2.Shaoxing Water Resources and Hydropower Survey and Design Institute Co,Ltd Shaoxing
Abstract:
During the construction of a pumping station, the deformation monitoring of the steel template for its suction boxes is of great importance to guarantee the safe operation of pumps. A PPP-BOTDA based deformation method is proposed to overcome the shortcomings of traditional methods with regard to poor adaptability to complicated shaped surfaces and the constraints of environmental factors. A temperature compensation method is proposed to solve the problem that the Brillouin frequency shift is sensitive to both temperature and strain. An improved conjugated beam method is then adopted to convert the strain after removing the temperature effect to structural deformation. The method is successfully applied to the deformation monitoring of steel templates for suction boxes of a drainage pumping station. The results show that tensile strain and deformation were occurred on the top and both sides of the steel templates, which increased during concrete pouring and stabilized after completion.
Key words:  deformation monitoring  distributed fiber optic sensing  pulse-prepump Brillouin optical time domain analysis  temperature compensation  pumping station
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