在垂直循环载荷作用下对基层土壤进行循环剪切试验时,对传感器压电土工电缆进行评估

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

摘要

近来,路基土的变形导致了越来越多的道路沉陷病害。实时监测路基变形对于确保路基运营安全至关重要。本文测试了具有阻抗应变效应和压电效应的传感器压电地电电缆(SPGC)。通过垂直静载荷循环剪切试验和垂直循环载荷循环剪切试验获得的 SPGC 阻抗和电压信号来评估监测效果。结果表明,法向应力对土壤的抗剪强度影响最大,而法向应力和水平剪切位移振幅对土壤的应变影响显著。改变法向和水平剪切频率对土壤的剪切强度和应变影响不大。在剪切循环的初始阶段,SPGC 的归一化阻抗和电压分别快速下降和上升;在剪切循环的中后期,这些变化相对较小。SPGC 电压波形揭示了不同法向和水平剪切频率下剪应力和垂直位移的变化,由此可以评估上述条件下基层土的稳定性。在垂直静载荷和垂直循环载荷下进行的循环剪切试验中,SPGC 阻抗和有效电压随循环次数的变化基本保持一致。但不同的是,垂直循环载荷下的 SPGC 阻抗波谷大于垂直静态载荷下的波谷;同样,循环载荷下的 SPGC 有效电压也大于静态载荷下的有效电压。通过分析路基土壤中的 SPGC 阻抗和电压信号,明确了 SPGC 归一化阻抗和有效电压与剪应力的一致性;这有助于我们评估路基的健康状况,并在滑动发生前监测前兆信号的特征,从而有机会及时发出警告。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of sensor-enabled piezoelectric geoelectric cable in cyclic shear tests of subgrade soil under vertical cyclic loads

Of late, deformation of subgrade soil has led to an increasing number of road subsidence diseases. Real-time monitoring of subgrade deformation is critical to ensure the safety of subgrade operations. In this paper, a sensor-enabled piezoelectric geoelectric cable (SPGC) with impedance strain effect and piezoelectric effect is tested. The SPGC impedance and voltage signals obtained by cyclic shear test under vertical static load and cyclic shear test under vertical cyclic load are used to evaluate the monitoring effect. The results showed that normal stress had the greatest effect on the shear strength of the soil, whereas the normal stress and horizontal shear displacement amplitude significantly influenced the strain in the soil. Varying the normal and horizontal shear frequencies had little effect on the shear strength and strain of the soil. The normalized impedance and voltage of the SPGC, respectively, decreased and increased rapidly during the initial stage of the shear cycle; these changes were relatively small during the middle and late stages of the shear cycle. The SPGC voltage waveform revealed the changes in the shear stress and vertical displacement under different normal and horizontal shear frequencies, from which the stability of the subgrade soil under the aforementioned conditions could be evaluated. The variations in the SPGC impedance and effective voltage from the cyclic shear tests under both vertical static and vertical cyclic loads remained essentially consistent with the number of cycles. However, there was a difference in that the trough of the SPGC impedance under the vertical cyclic load was larger than that under the vertical static load; likewise, the effective SPGC voltage under the cyclic load was larger than that under the static load. Through an analysis of the SPGC impedance and voltage signals in the subgrade soil, the consistency of the SPGC-normalized impedance and effective voltage with shear stress was clarified; this helped us evaluate the health of the subgrade and monitor the characteristics of the precursor signals before a slide were to occur, thereby affording us an opportunity to issue timely warnings.

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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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