| 分布埋入式光纤与隧道衬砌耦合性能试验及应用 |
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| 引用本文： | 侯公羽,谢冰冰,韩育琛,胡涛,李子祥,杨兴昆,周天赐,肖海林.分布埋入式光纤与隧道衬砌耦合性能试验及应用[J].岩土力学,2020,41(2):714-726. |
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| 作者姓名： | 侯公羽 谢冰冰 韩育琛 胡涛 李子祥 杨兴昆 周天赐 肖海林 |
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| 作者单位： | 1. 中国矿业大学（北京）力学与建筑工程学院，北京 100083；2. 新疆工程学院 矿业工程与地质学院，新疆 乌鲁木齐 830091；
3. 国电联合动力技术有限公司，北京100039；4. 中铁十八局集团轨道交通工程有限公司，天津300350 |
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| 基金项目： | 中央在京高校重大成果转化项目（No. ZDZH20141141301）；国家自然科学基金委员会与神华集团有限责任公司联合资助重点项目（No. U1261212） |
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| 摘 要： | 为探究埋入式光纤与隧道衬砌的耦合性能，分别从理论与试验两个方面进行研究，并在实际工程中进行了验证。构建了光纤、中间体和基体结构力学分析模型，进行光纤应变传递机制理论分析，计算了光纤应变传递效率；使用钢筋混凝土梁模拟隧道衬砌，进行了2组不同加载速率的试验。其中，在同一根梁内（同一工况）设计6种光纤的布设方式，以位移控制的方式在梁跨中部位进行单点多级加载，使用BOFDA（布里渊散射光频域分析）技术分别对6条光纤进行监测。试验结果表明：6条光纤均可以有效监测梁从开始加载至钢筋开始屈服阶段，光纤与梁耦合性最好；钢筋开始屈服直至梁破坏阶段，光纤应变不再增加甚至减小或呈现出光纤断裂的状态，此过程光纤与梁耦合性较差；除开槽埋入式光纤的有效监测应变差为3 000×10?6外，其余布设方式光纤有效监测应变差为2 000×10?6；光纤在长距离（>>146 mm）埋入式布设情况下可认为其应变传递效率接近100%，2组不同试验结果呈现相似规律。在北京市新机场线地铁暗挖隧道CRD工法区间进行了工程应用研究，监测结果表明分布埋入式光纤布设工艺是可行的，可为分布式光纤技术在地下工程结构监测中的应用提供有价值的参考。
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| 关 键 词： | 分布埋入式 隧道衬砌 耦合性能 BOFDA技术 |
| 收稿时间： | 2019-02-18 |
| 修稿时间： | 2019-05-12 |
Experimental study and engineering application of coupling performance between distributed embedded optical fiber and tunnel lining |
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| HOU Gong-yu,XIE Bing-bing,HAN Yu-chen,HU Tao,LI Zi-xiang,YANG Xing-kun,ZHOU Tian-ci,XIAO Hai-lin.Experimental study and engineering application of coupling performance between distributed embedded optical fiber and tunnel lining[J].Rock and Soil Mechanics,2020,41(2):714-726. |
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| Authors: | HOU Gong-yu XIE Bing-bing HAN Yu-chen HU Tao LI Zi-xiang YANG Xing-kun ZHOU Tian-ci XIAO Hai-lin |
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| Institution: | 1. School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
2. School of Mining Engineering, Xinjiang Institute of Engineering, Urumqi, Xinjiang 830091, China;
3. Guodian United Power Technology Co., Ltd., Beijing 100039, China;
4. China Railway Eighteen Bureaus Group Rail Transportation Engineering Co., Ltd., Tianjin 300350, China |
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| Abstract: | The coupling performance of embedded optical fiber and tunnel lining is studied using theoretical and experimental methods, and then is verified in practical engineering. We calculate the strain transmission efficiency of fiber by modeling and analyzing the structure of optical fiber, intermediate and matrix. Totally two sets of experiments are designed. The reinforced concrete beams with 6 kinds of optical fiber layout are designed in same working condition. The multistage loading was carried out at a single point in the way of displacement control. At the same time, 6 optical fibers are monitored based on the BOFDA (Brillouin optical frequency domain analysis) technology. The results of two different groups show the similar law: six optical fibers can effectively monitor the process of beam loading from the stage of beginning to the stage of yielding, and the coupling between fiber and beam is good in this process. When the reinforcement begins to yield to the failure process, the fiber strain no longer increases, even decreases or presents the state of fiber fracture, and the coupling of the fiber and the beam is poor in this process. Except for the slotted embedded fiber, the effective monitoring strain difference is 3 000×10?6, the effective strain difference of the remaining fiber is 2 000×10?6. Under the condition of long distance (>>146 mm) embedding, the strain transmission efficiency of optical fiber is close to 100%. Taking the underground excavation section of the new built airport in Beijing as an example, the fiber is embedded in the two waist and vault of the initial lining, and the construction process of the CRD method is monitored by monitoring fiber. Monitoring results show that the embedding technology is feasible, which is able to provide references and valued suggestions for other related monitoring projects. |
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| Keywords: | distributed burying tunnel lining coupling performance BOFDA technology |
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