摘要
在役预应力钢筒混凝土管道结构内部预应力钢丝断裂会引发爆管,威胁长距离调水工程的长期安全稳定运行。基于"远场涡流-电感耦合效应"的电磁检测法可用于检测和定位预应力钢丝断裂区域。应用轴对称有限元方法模拟极低频电磁场从预应力钢筒混凝土管内到管外的传播情况,分析预应力钢丝环绕形成的电感效应和薄钢筒内涡流场的耦合作用,总结预应力钢丝断裂数量对管内壁附近磁感应强度和相位分布的影响规律,为预应力钢筒混凝土管道断丝检测提供初步的理论依据。
Pre-stressed concrete cylinder pipes in service often suffer from the wire breakage problems,it may cause pipe burst accidents and is a threat on the safety and service stability of the long-distance water conveyance projects.Based on the remote field eddy current-inductance coupling effect,the electromagnetic method can be used to detect and locate the broken zone of pre-stressed steel wire.This paper tries to apply the axisymmetric finite element method to simulate the propagation of the extreme low frequency electromagnetic wave from inside to outside of a pipe.Then the coupling effect of the eddy field in the thin steel cylinder and the windings of the prestressed steel wires is discussed and the relationship between the distribution of the magnetic induction intensity and related phase close to the inner pipe wall and number of broken wires is concluded,supplying the preliminary theoretical basis for the wire breakage detection of the pre-stressed concrete cylinder pipe.
作者
商峰
董猛
王正
SHANG Feng;DONG Meng;WANG Zheng(Research Center for Sustainable Hydropower Development,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《无损检测》
2019年第4期18-23,共6页
Nondestructive Testing
基金
国家重点研发计划(2018YFC0406903)
中国水利水电科学研究院科研专项(SS0145B122017)
关键词
预应力钢筒混凝土管
无损检测
远场涡流-电感耦合效应
有限元
pre-stressed concrete cylinder pipe
nondestructive test
remote field eddy current-inductance coupling effect
finite element method
