引水钢岔管水压试验分布式应力测量  

Distributed stress measurement for water pressure test of diversion steel branch pipe

作　　者：尹国路 马璟铭 姜胜先 王鑫 张元寅 朱涛[2,1] YIN Guolu;MA Jingming;JIANG Shengxian;WANG Xin;ZHANG Yuanyin;ZHU Tao(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;Key Laboratory of Optoelectronic Technology and Systems,Chongqing University(Ministry of Education),Chongqing 400044,China;Chongqing Branch,Changjiang River Scientific Research Institute,Chongqing 400026,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学光电技术及系统教育部重点实验室,重庆400044 [3]长江科学院重庆分院,重庆400026

出　　处：《光学精密工程》2024年第17期2635-2644,共10页Optics and Precision Engineering

基　　金：国家重点研发计划资助项目(No.2023YFF0715700)。

摘　　要：引水钢岔管的结构尺寸大、焊接工况复杂,且需要长期耐受6 MPa的水压,迫切需要一种分布式、高精度、高空间分辨率的应力测量技术,以便在水压试验中进行全方位的应力测量和结构健康评估。传统的点式应变片只能进行局部应力测量,且测量精度受制于防水措施、贴片工艺、温度变化等因素。为此,提出了一种基于光频域反射仪的引水钢岔管水压试验应力测量方法,采用沿焊缝布设的标准单模光纤作为传感器,测量空间分辨率达到5.8 cm,应力与水压力成线性关系并且沿焊缝存在0.2~0.6 m的周期性变化。月牙肋板焊缝的腰部应力最大,达到196.2 MPa;主锥环缝的应力在300 MPa附近;相贯线焊缝的应力呈180°对称分布,在腰线附近存在352.0 MPa的最大应力,顶部和底部基本不存在应力。The diversion steel branch pipe is large and complex to weld,requiring endurance for long-term water pressure of 6 MPa.There is a need for a high-precision,high-resolution stress measurement tech⁃nique for comprehensive assessment during water pressure tests.Traditional strain gauges are limited to lo⁃calized measurements and restricted by waterproofing,application processes,and temperature changes.This study proposes using optical frequency domain reflectometry for stress measurement in the pipe.A standard single-mode fiber sensor is laid along the weld seam for a spatial resolution of 5.8 cm.Stress correlates linearly with water pressure and varies periodically from 0.2 to 0.6 m along the weld seam.Maximum stress reaches 196.2 MPa at the crescent rib weld seam's waist,about 300 MPa at the main conical ring seam,and distributes symmetrically along the intersecting line,with a peak of 352.0 MPa near the waist⁃line and minimal stress at the top and bottom.

关 键 词：分布式应力测量 光频域反射仪 引水钢岔管 抽水蓄能 

分 类 号：TN253[电子电信—物理电子学]