Monitoring method and experiment for stratum stress based on fiber Bragg grating sensing

Zhao Bin; ZHONG Zhi-cheng; LIN Jun; LI Zhe; LIU Yu-juan

doi:10.3788/OPE.20162413.0346

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Monitoring method and experiment for stratum stress based on fiber Bragg grating sensing

更新时间：2020-08-13

- Monitoring method and experiment for stratum stress based on fiber Bragg grating sensing
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 346-352(2016)
- 作者机构：
  
  吉林大学仪器仪表与电气工程学院,吉林长春,130022
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0346
  CLC：
- Received：10 May 2016，
  
  Revised：12 June 2016，
  
  Published：14 November 2016
- 稿件说明：
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赵斌, 仲志成, 林君等. 基于光纤光栅传感地层应力的监测方法与实验[J]. 光学精密工程, 2016,24(10s): 346-352

ZHAO Bin, ZHONG Zhi-cheng, LIN Jun etc. Monitoring method and experiment for stratum stress based on fiber Bragg grating sensing[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 346-352
赵斌, 仲志成, 林君等. 基于光纤光栅传感地层应力的监测方法与实验[J]. 光学精密工程, 2016,24(10s): 346-352 DOI： 10.3788/OPE.20162413.0346.

ZHAO Bin, ZHONG Zhi-cheng, LIN Jun etc. Monitoring method and experiment for stratum stress based on fiber Bragg grating sensing[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 346-352 DOI： 10.3788/OPE.20162413.0346.

摘要

为了实现对地下岩层平面应力状态及其变化规律的有效监测，基于光纤光栅传感技术提出了一种平面直角应变花与光纤光栅相结合的监测方法。将光纤光栅胶结在碳纤维层积复合材料的凹槽内形成光纤应变传感单元，三个光纤应变传感单元以直角应变花的形式附着于圆柱形结构上，形成了对平面应力状态监测的钻孔三分量传感器。以二向应变特征方程与FBG应变传感理论为基础，推导出最大主应变与波长变化之间的关系，根据胡可定律及传感器所处地层的弹性模量得出了主应力与波长变化之间的关系。对光纤应变传感单元进行了温度与应变的标定，在室内对传感装置进行了模拟实验。实验结果表明：光纤应变传感单元可监测的应变为-1500～1500

；应力测量量程为0～4 MPa；主应力的监测平均误差为1.50%；应力分辨率为0.02816 MPa。传感器的监测结果与实际加载应力的变化规律相一致，可满足对地下岩层竖直平面应力状态连续监测的要求。

Abstract

To achieve effective monitoring of underground rock formation stress and its changing rules

a monitoring method combining rectangular strain rosette with FBG (Fiber Bragg Grating) based on FBG sensing technology is put forward. Method:adhere fiber grating to the groove of fiber carbon laminated composite materials to form the fiber strain sensor unit

and three fiber strain sensor units were attached to the cylindrical structure in the form of rectangular strain rosette to form the drilling three-component sensor for monitoring of plane stress state; deduce the relationship between the maximum principal strain and wavelength change based on bi-direction strain characteristic equation and FBG strain sensing theory

and then work out the relationship between principal strain and wavelength change in accordance with Hooke's Law and elasticity modulus of the formation where the sensor is located; carry out the temperature calibration and strain calibration in the fiber strain sensor unit

and then conduct a simulation experiment in the sensing devices indoors. The results indicate that strain monitoring range of the fiber strain sensor unit is -1500~1500

; the stress measuring span is 0~4 MPa; average monitoring error of the principal stress is 1.50%; the stress resolution is 0.02816 MPa. Monitoring results of the sensor is consistent with changing rules of the actually-loaded stress

which can meet the requirements for continuous monitoring of the underground vertical and plane stress.

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