Fibre Bragg grating based effective soil pressure sensor for geotechnical applications
Fibre Bragg grating based effective soil pressure sensor for geotechnical applications
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DOI：
10.1117/12.835751
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
R. Correia;Jin Li;S. Staines;E. Chehura;S. James;J. Kutner;P. Dewhurst;P. Ferreira;R. Tatam
中科院分区：
文献类型：
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作者：
R. Correia;Jin Li;S. Staines;E. Chehura;S. James;J. Kutner;P. Dewhurst;P. Ferreira;R. Tatam
提出了一种基于光纤布拉格光栅的土工有效土压力传感器。该传感器可以同时测量总土压力和孔压，从而可以计算土壤的有效应力。用加压空气对传感器进行了标定，总压力和孔压的压力灵敏度分别为2.02×10~(-3)±2.84×10~(-5)nm/kPa和1.87×10~(-3)±6.88×10~(-5)nm/kpa。这相当于使用1 PM询问系统对总压和孔压的压力分辨率分别为4.95x10-1kPa和5.46x10-1kPa.在两种类型的土壤中进行的测量表明，总压力敏感性与土壤密度/硬度有关。孔压测量结果与初步标定结果吻合较好。
An effective-soil-pressure sensor for geotechnical applications based on Fibre Bragg Gratings is presented. The sensor simultaneous measures total soil pressure and pore pressure, allowing the calculation of the effective stress of soil. Calibration of the sensor using pressurised air demonstrated a pressure sensitivity of 2.02x10-3 ± 2.84x10-5nm/kPa and 1.87x10-3 ± 6.88x10-5nm/kPa for the total and pore pressure respectively. This corresponds to a pressure resolution of 4.95x10-1kPa and 5.46x10-1kPa for total and pore pressure using a 1pm interrogation system. Measurements undertaken in two types of soil demonstrated dependence of the total pressure sensitivity on soil density/stiffness. Pore pressure measurements agreed well with the preliminary calibration.