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

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.