基于柔性压电振动传感的埋地管道渗漏监测试验研究

    Experimental Study on Leak Detection Monitoring of Buried Pipelines Based on Flexible Piezoelectric Vibration Sensing

    • 摘要: 近年来,管道渗漏实时监测技术备受学者们关注与研究,然而受技术特性、成本投入及应用场景等因素制约,目前还缺乏有效的分布式振动传感技术。对此,本文针对基于压电效应和阻抗应变效应的自传感压电土工电缆(Sensor-enabled piezoelectric geocable,SPGC)开展测试,通过获取输水管道渗漏试验产生的阻抗及电压信号,系统评价其监测效果。试验结果表明,渗漏孔直径16 mm、水压0.1-0.6 MPa时:SPGC电压信号与加速度计数据时频域同步,渗漏瞬间电压峰值较稳定时提4.4倍,能够有效捕捉管-土耦合作用下的渗漏动态演变过程;归一化阻抗与应变片均能有效表征渗漏诱发的土体微应变响应。研究结果表明SPGC具备出色的工程适用性,其多参数同步监测机制突破了传统方法的单一维度局限,有望为管道长期运维提供一种全新的技术手段。

       

      Abstract: In recent years,real-time pipeline leakage monitoring technology has garnered significant attention and research from scholars. However, constrained by factors such as technical characteristics, cost investment, and application scenarios, effective distributed vibration sensing technology remains lacking at present.To address this, this paper conducts tests on sensor-enabled piezoelectric geocable (SPGC) based on the piezoelectric effect and impedance strain effect. By acquiring impedance and voltage signals generated during water pipeline leakage tests, the monitoring effectiveness of SPGC is systematically evaluated.Test results indicate that at a leakage pore diameter of 16 mm and water pressure ranging from 0.1 to 0.6 MPa:The SPGC voltage signal exhibits time-frequency domain synchronization with accelerometer data. - The instantaneous voltage peak during leakage is 4.4 times higher than the steady-state value, effectively capturing the dynamic evolution of leakage under pipe-soil interaction. - Both normalized impedance and strain gauges can effectively characterize the microstrain response of soil induced by leakage.Research findings demonstrate that SPGC possesses outstanding engineering applicability. Its multi-parameter simultaneous monitoring mechanism overcomes the limitations of traditional single-dimensional approaches, offering a promising new technical solution for long-term pipeline operation and maintenance.

       

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