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王军, 刘志明, 蔡国军, 叶飞龙, 宋小进. 基于砂土界面剪切试验的自传感压电土工电缆监测效果评价[J]. 岩土工程学报, 2023, 45(10): 2023-2031. DOI: 10.11779/CJGE20220891
引用本文: 王军, 刘志明, 蔡国军, 叶飞龙, 宋小进. 基于砂土界面剪切试验的自传感压电土工电缆监测效果评价[J]. 岩土工程学报, 2023, 45(10): 2023-2031. DOI: 10.11779/CJGE20220891
WANG Jun, LIU Zhiming, CAI Guojun, YE Feilong, SONG Xiaojin. Monitoring effects of sensor-enabled piezoelectric geocable based on sand interface shear tests[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(10): 2023-2031. DOI: 10.11779/CJGE20220891
Citation: WANG Jun, LIU Zhiming, CAI Guojun, YE Feilong, SONG Xiaojin. Monitoring effects of sensor-enabled piezoelectric geocable based on sand interface shear tests[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(10): 2023-2031. DOI: 10.11779/CJGE20220891

基于砂土界面剪切试验的自传感压电土工电缆监测效果评价

Monitoring effects of sensor-enabled piezoelectric geocable based on sand interface shear tests

  • 摘要: 近年来,基于分布式的路堤边坡内部变形实时监测技术受到了学者们的广泛关注和研究,然而由于技术、成本、场景等因素的限制,目前还没有一种技术可以完全实现大面积应用。对此,测试了一种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),并通过获得SPGC-砂土界面剪切试验中产生的阻抗及电压信号评价其监测效果。试验结果表明,剪切位移-剪应力曲线与剪切位移-归一化阻抗曲线具有良好的对应关系(可检测剪切带土体应变软化的发展);有效值电压随着剪切速率的增大而成正比例关系增大(可量化剪切带的土体位移速率);随着法向应力和相对密实度的增大,有效值电压逐渐增大,归一化阻抗逐渐减小(可反映剪切带土中应力的变化);通过双线性模型描述剪切位移-归一化阻抗的相互关系的效果较好。SPGC可以实现路堤边坡滑坡灾变定位和前兆识别,有望为路堤边坡施工和运维监测提供一种分布式、低成本、自驱动的解决方案。

     

    Abstract: In recent years, the distributed real-time monitoring technology for internal deformation of bank slopes has received extensive attention and researches by scholars. However, due to the limitations of such factors as technology, cost and scenarios, there is currently no technology that can achieve large-scale applications. In this regard, a sensor-enabled piezoelectric geocable (SPGC) based on the piezoelectric effects and impedance strain effects is tested, and its monitoring effects are evaluated by obtaining the impedance and voltage signals generated in the SPGC-sand interface shear tests. The test results show that the shear displacement-shear stress curve has a good correspondence with the shear displacement-normalized impedance one (the development of strain softening of soil in the shear zone could be detected). The effective voltage increases proportionally with the increase of the shear rate (the displacement rate of soil in the shear zone can be quantitatively calculated). With the increase of the normal stress and relative compactness, the effective voltage gradually increases, and the normalized impedance gradually decreases (the change of stress of soil in the shear zone can be reflected). The shear displacement-normalized impedance correlation is better described by the bilinear model. The SPGC can realize to locate landslide disasters and identifiy their precursors. It may provide a distributed, low-cost, self-driving solution for the construction and operation monitoring of bank slopes.

     

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