摘要
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100mm左右,光纤光栅传感器的临界长度为149.23mm。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。
In order to detect the deformation and development of deep rock strata, a FBG-GFRP-cement mortarunconsolidated 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 ram, 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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第12期2551-2556,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50374055
50774060)
陕西省岩层控制重点实验室项目(02JS43)
关键词
采矿工程
岩层变形
钻孔植入式
光纤光栅
应变传递
应用
mining engineering
rock strata deformation
borehole-embedded
fiber Bragg grating
strain transfer
application
