Figures of the Article
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Schematic diagram of sand coupling test device for controllable confining pressure sensing optical cable
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Sand with different particle sizes
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Schematic diagram of sample preparation method
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Comparison between actual and test tensions of sand samples A, B and C
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Curves of actual tension and pull-out displacement of sand samples A, B and C
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Curves of actual tension and pull-out displacement of different sand samples under same pressure
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Distribution curves of strain of sand sample C under confining pressure of 0 MPa
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Distribution curves of strain of sand samples A, B and C under confining pressures of 0 and 1 MPa
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Distribution of shear stress in optical fiber microunits
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Distribution curves of interfacial average shear stress of sand sample B
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Curves of particle size and strain transfer depth under confining pressures of 0~1 MPa
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Curves of deformation coordination coefficient
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The calculated critical confining pressures of different.sand soils
Tables of the Article
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性能参数 指标值 传感长度/m 100 空间分辨率/mm 10 采样率/Hz 4 应变测量精度/με ±1.0 应变测量范围/με ±15000 温度测量精度/ºC ±0.1 温度测量范围/ºC −200~1200 -
性能参数 指标值 纤芯直径d/mm 0.9 护套直径D/mm 2 弹性模量E/GPa 0.37 抗拉强度σm/MPa 23.08 应变范围/με −10000~+20000 -
砂样编号 颗粒描述 粒径/mm 干密度/
(g·cm-3)加压/
MPaA 细砂 0.5~1 1.52 0~1 B 中砂 1~2 1.57 0~1 C 粗砂 2~4 1.64 0~1