利用表面波对预应力钢筒混凝土管砂浆保护层开裂监测的数值仿真*

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胡少伟,汪旭,任姝璇,朱开源.利用表面波对预应力钢筒混凝土管砂浆保护层开裂监测的数值仿真*[J].,2021,40(4):569-578

Numerical modeling on crack monitoring of mortar moating of PCCP based on surface wave

投稿时间：2020-08-02修订日期：2021-07-06

中文摘要:

预应力钢筒混凝土管(PCCP)长期受到土壤腐蚀介质与各种静动荷载耦合作用，当砂浆保护层出现裂缝并不断发展会促使外界腐蚀介质锈蚀高强预应力钢丝，诱发断丝爆管事故，因此亟需开展PCCP管道运行过程中的砂浆保护层开裂过程安全性监测方法的研究。在进行合理简化及消除不稳定因素的基础上，该文基于ABAQUS有限元软件设置了长度、深度、宽度、频率4个对照组用于判断表面应力波监测PCCP环向裂缝发展的效果(主要依据接收端电压幅值的变化幅度判断)，发现接收端信号随裂缝深度增加时变化最为明显，对预应力钢丝是否即将遭受腐蚀具有预警作用；而接收端信号幅值随裂缝宽度的增大会缓慢增加，且对裂缝长度的变化敏感性较弱；在压电片间距相同(1.2 m)的情况下，10 kHz为本次监测的最优频率。该文还改变了压电陶瓷(PZT)的布置方式，比较了表面粘贴式和内置式两种方法的监测效果(即比较面波与体波的监测效果)，发现在1.2 m 间距及10 kHz电压源频率下，面波监测的效果较好。上述结果表明PZT表面应力波动法可用于PCCP砂浆保护层的监测，这对PCCP生命周期预测极具价值。

英文摘要:

Prestressed concrete cylinder pipe (PCCP) bears long-term coupling action of corrosion and static and dynamic load. When cracks appear in the protective layer of mortar and develop continuously, the corrosion media corrode the high-strength prestressed steel wires, inducing the pipe burst accident. Therefore, it is urgent to carry out the research on the safety monitoring method on mortar layer cracking during the operation of PCCP. On the basis of reasonable simplification and elimination of unstable factors, four control groups of length, depth, width and frequency are set to judge the effect of surface wave monitoring on PCCP circular cracks (mainly through the amplitude of the receiving terminal voltage) based on ABAQUS finite element software. It is found that the signal at the receiving terminal changes most obviously with the increase of crack depth, which had an early warning effect on whether the prestressed steel wire was about to be corroded. The amplitude of the signal at the receiving terminal increases slowly with the increase of the width, and hardly changes with the change of the crack length. Under the condition of the same spacing of piezoelectric plates 10 kHz is considered as the optimal frequency for this monitoring. This paper also changed the layout of PZT, comparing the monitoring effects of two methods—surface sticking method and built-in method (namely, comparing the monitoring effects of surface wave and body wave), finding that the effect of surface wave monitoring is better at the spacing of 1.2 m and 10 kHz voltage source frequency. The above results indicate that surface wave measurement by PZT can be used to monitor mortar coating of PCCP, which is of great value to the life cycle prediction of PCCP.

DOI：10.11684/j.issn.1000-310X.2021.04.011

中文关键词:PCCP 压电传感技术表面应力波裂缝监测

英文关键词:PCCP Piezoelectric sensor technology surface wave crack monitoring

基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）

作者	单位	E-mail
胡少伟	重庆大学	hushaowei@cqu.edu.cn
汪旭	重庆大学	wangxu2902@126.com
任姝璇	重庆大学	397066876@qq.com
朱开源	重庆大学	247974313@qq.com