岩土力学2017，Vol.38Issue(8)：2456-2464,9.DOI:10.16285/j.rsm.2017.08.036
页岩单轴压缩破坏试验的光纤布拉格光栅测试技术研究
Testing Technology of fiber Bragg grating in the shale damage experiments under uniaxial compression conditions
摘要
Abstract
Since serious environmental pollution problems are caused by the continuous development of fossil energy industry and releasing huge combustion products,shale gas is gradually becoming the key element of the green revolution.The Longmaxi shale formations in the Sichuan basin are the main mining layers of shale gas in China.In the process of exploiting shale gas,monitoring the stress and strain of the shale gas reservoir is helpful to guide programs in exploitation of shale gas and provide management of security risk and other works.Fiber Bragg grating (FBG) strain sensor system is a widely-used advanced technique to monitor real-time strain in recent years.In this paper,the FBG system was employed to measure the strain of shale surface in uniaxial compression tests using the MTS 815 machine.The results show that the strain variation of shale surface was well recorded by FBG,and axial strain transferring was more effective than that of the radial strain.It is found that the strains measured by FBG sensors were superior to those from strain gage rosettes,but the axial strain variation was susceptible to the development of surface cracks,resulting in lower strain transmission efficiency.The strain transfer ratio was mainly influenced by the grating itself,the properties and thickness of the bonding layer.According to experimental results from two kinds of epoxy resins,it can be seen that the new 555 viscose was better than DP100.关键词
页岩/光纤布拉格光栅/单轴压缩试验/应变测量/变形监测Key words
shale/fiber Bragg grating/uniaxial compression testing/strain measurement/deformation monitoring分类
建筑与水利引用本文复制引用
范成凯,孙艳坤,李琦,鲁海峰,牛智勇,李霞颖..页岩单轴压缩破坏试验的光纤布拉格光栅测试技术研究[J].岩土力学,2017,38(8):2456-2464,9.基金项目
中国自然科学基金面上资助项目“酸气-咸水作用下岩石特异性破坏机理研究”(No.41274111).This work was supported by the National Natural Science Foundation of China "Failure mechanism of rock under acid gas and saline water interaction"(41274111). （No.41274111）
