›› 2017, Vol. 38 ›› Issue (8): 2456-2464.doi: 10.16285/j.rsm.2017.08.036

• 测试技术 • 上一篇    

页岩单轴压缩破坏试验的光纤布拉格光栅测试技术研究

范成凯1, 2,孙艳坤1, 2,李 琦1,鲁海峰3,牛智勇1, 2,李霞颖1, 2   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室,湖北 武汉 430071; 2. 中国科学院大学,北京 100049;3. 安徽理工大学 地球与环境学院,安徽 淮南 232001
  • 收稿日期:2016-09-23 出版日期:2017-08-11 发布日期:2018-06-05
  • 通讯作者: 李琦,男,1972年生,博士,研究员,主要从事酸气回注、二氧化碳地质利用与封存方面的研究工作。E-mail: qli@whrsm.ac.cn E-mail:chengkaivan@163.com
  • 作者简介:范成凯,男,1994年生,硕士研究生,主要从事岩石物理与渗流监测方面的研究工作。
  • 基金资助:

    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)。

Testing Technology of fiber Bragg grating in the shale damage experiments under uniaxial compression conditions

FAN Cheng-kai1, 2, SUN Yan-kun1, 2, LI Qi1, LU Hai-feng3, NIU Zhi-yong1, 2, LI Xia-ying1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. School of Earth and Environment, Anhui University of Science and Technology, Huainan, Anhui 232001, China
  • Received:2016-09-23 Online:2017-08-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China “Failure mechanism of rock under acid gas and saline water interaction” (41274111).

摘要: 由于化石能源工业的不断发展及其大量燃烧造成的严重环境污染问题等原因,促使页岩气逐渐成为绿色革命的关键能源组成之一。四川盆地龙马溪组是我国页岩气主力开采层位,在页岩气开采过程中,针对储层变形监测将有利于指导现场页岩气开采方案和安全风险管理等工作。光纤布拉格光栅测量应变的方法是近年来被广泛使用的一种新颖先进的实时应变监测技术,研究将其运用于页岩单轴压缩试验并对页岩表面应变进行监测。结果表明:(1)光纤布拉格光栅能够较好地监测页岩表面应变变化且环向应变传递效率高于轴向;(2)光纤布拉格光栅测试结果优于十字应变花,但轴向应变变化极易受表面裂缝发育影响而导致较低传递效率;(3)光栅传递效率受光栅本身力学性质、粘贴层性质及厚度等因素影响。从试验选择的两种环氧树脂黏胶对比试验结果中可知,新型555黏胶效果更佳。

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

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.

Key words: shale, fiber Bragg grating, uniaxial compression testing, strain measurement, deformation monitoring

中图分类号: 

  • TU 454

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