基于光时域反射技术和瑞利散射原理,将高精度的自动力-光耦合测试系统与土工大三轴剪切试验仪相结合,完成了光纤滑动监测的力-光本构关系模型试验.结果表明,传感光纤的初始损耗达30～50dB,动态范围达3.0～3.5 mm,又利用试验测试数据,经曲线拟合,得出滑动损耗的半经验公式.%Based on Optical Time-Domain Reflectometry and Rayleigh Scattering, fully automatic control mechanics-optics coupling test system was designed for triaxial shear model tests of sliding sensing and the constitutive relation of sliding sensing using distributed fiber sensing was investigated. Its initial sensing sliding light loss attained 30～50 dB, dynamic sensing range reached 3. 0～3. 5 mm and semi-empirical formula was fitted from data.
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