岩层变形检测的植入式光纤Bragg光栅应变 传递分析与应用

 为研究深部岩层的变形及其发展过程，构建光栅–传感器结构–水泥砂浆–岩层的应变传递系统，根据光纤光栅传感器的应变传递理论，分析用于岩石检测的光纤、中间层和岩层力学参数对光栅应变传递率的影响，给出光纤光栅传感器及钻孔参数设计，为工程应用提供依据。研究表明，深孔岩层监测的钻孔直径宜选100 mm左右，光纤光栅传感器的临界长度为149.23 mm。将其应用于济三煤矿第四系松散地层沉降变形监测中，结果表明，光纤光栅传感器可对松散层的应变变化进行实时检测。

STRAIN TRANSFER OF EMBEDDED FIBER BRAGG GRATING SENSORS FOR ROCK DEFORMATION AND ITS APPLICATION

In order to detect the deformation and development of deep rock strata，a FBG-GFRP-cement mortar- unconsolidated soil layer strain transfer system is formed；based on the theoretical analysis results of the strain transferring of FBG sensor，the effects of the mechanical parameters of optical fiber，middle layer and host material on the strain transfer rate are analyzed；and the FBG sensor used for rock deformation monitoring and the borehole parameters are designed，which provides a basis for engineering application. The results show that，in the monitoring of rock strata，the diameter of the borehole is adopted to be about 100 mm，the critical length of FBG sensor used in this system is 149.23 mm. This system is then applied to the settlement monitoring of Quaternary system unconsolidated soil layer in Jining coal mine No.3，it is shown that FBG sensors can be used to monitor strain change of unconsolidated layer.