Application of optical fiber Bragg grating sensing technology to tunnel model test

MA Hao-hao; LIU Bao-jian; WENG Xiao-lin; YAO Bei-bei

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Application of optical fiber Bragg grating sensing technology to tunnel model test

更新时间：2026-06-25

- Application of optical fiber Bragg grating sensing technology to tunnel model test
- Vol. 33, Issue S2, (2012)
- 作者机构：
  
  1. 长安大学公路学院,西安,710064
  2. 同济大学地下工程系,上海,200092
- 作者简介：
- 基金信息：
- DOI：
  CLC： U452
- Online First：11 December 2012，
  
  Published：2012
- 稿件说明：
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MA Hao-hao, LIU Bao-jian, WENG Xiao-lin, et al. Application of optical fiber Bragg grating sensing technology to tunnel model test[J]. 2012, 33(S2).
DOI：

MA Hao-hao, LIU Bao-jian, WENG Xiao-lin, et al. Application of optical fiber Bragg grating sensing technology to tunnel model test[J]. 2012, 33(S2). DOI：

摘要

在模型试验中，锚杆一般尺寸较小，应变监测较为困难，可将光纤Bragg传感技术（FBG）应用于隧道模型试验中解决该问题。基于西安地铁二号线4个典型断面实际工况进行隧道模型试验，将自行设计封装的光纤Bragg光栅传感器粘贴在锚杆模型表面，监测其在不同应力状态下的应变。根据隧道开挖前、隧道开挖后、衬砌支护后、抗裂极限状态和极限破坏状态5个应力状态的实测数据，得到锚杆轴力在隧道受力过程中的变化规律。试验结果表明，锚杆受力大小在隧道开挖前后有一定变化。衬砌支护后，随围岩压力增加，锚杆轴力基本呈增加趋势，拱顶附近锚杆承受压力，支护后压力变化不大；拱肩到墙角的锚杆承受拉力，衬砌支护后受力开始增加；锚杆在含水率大的黄土隧道中受力较大，更能发挥其作用。文中方法在模型试验中的应变监测方面提出新的可靠途径。

Abstract

The monitoring of bolt strain in the model test is relatively difficult for its small size. To solve the problem

the optical fiber Bragg grating sensing technology is applied to the tunnel model test. By constructing tunnel model test based on the actual working conditions of four typical sections in the metro line 2 in Xi’an

the strain of bolts in different stress states can be monitored by the fiber Bragg grating (FBG) sensors sticked to the bolt surface which are packaged by own design. According to the recorded data of five stress states: before the tunnel excavation

after the tunnel excavation

after lining

crack limit state

destruction limit state

the change law in the loading process of anchors axial force in the tunnel is obtained. Test results show that the anchor force has certain change before and after the excavation.After lining the axial force of anchor is increased with the increase of rock pressure. After lining the bolt pressure near the vault begin to decrease

the bolt tension from spandrel to corner begin to increase; the axial force of bolts in the larger water content loess is higher than in smaller ones. It is shown that the method presented provides a new and reliable approach for monitoring bolt strain in the model test.

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