Application of OFDR-based sensing technology in geo-mechanical model test on tunnel excavation using cross rock pillar method
LIU Quansheng1，2，WANG Juntao1，XIAO Longge3，LI Jichao3，LIU Bin1，ZHANG Xiaolei4
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province，Wuhan University，Wuhan，Hubei 430072，China；3. China Construction South Investment Co. Ltd.，Shenzhen，Guangdong 518022，China；4. Wuhan Junno Technology Co. Ltd.，Wuhan，Hubei 430074，China)
Abstract：The point-type sensors are widely used for monitoring the surrounding rock deformation in geo-mechanical modelling tests，but they can only obtain the strains at a few measuring points. Fibre optic sensing，as one rapidly developing distributed monitoring technology，can resolve this problem，but it cannot yet meet the requirement of high spatial resolution. This paper introduces one new OFDR(optical frequency domain reflectometry)-based sensing technology，and applies it in the geo-mechanical test modelling the excavation of shallow buried large diameter circular tunnel using the cross rock pillar method to achieve the continuous monitoring on the horizontal strains in different tunnel cross sections during excavation. Combined with the FEM analysis，the results show that the OFDR based sensing technology can accurately record the change of strain inside the geo-mechanical model during testing. It can reveal the deformation tendency of the surrounding rock when excavated using the cross rock pillar method，reflect the supporting effect of the cross rock pillar to the surround rock，and then guide the future tunnel excavation activities. The results are compared with the monitoring results obtained from the multipoint displacement meter after converting the strain-type results into the displacement-type results，and their deviations are within 10%. Generally，the OFDR-based sensing technology can be applied to the deformation monitoring in geo-mechanical modelling tests.
刘泉声1，2，王俊涛1，肖龙鸽3，李继超3，刘 滨1，张晓磊4. OFDR光纤传感技术在十字岩柱暗挖法物理模型试验中的应用[J]. 岩石力学与工程学报, 2017, 36(5): 1063-1075.
LIU Quansheng1，2，WANG Juntao1，XIAO Longge3，LI Jichao3，LIU Bin1，ZHANG Xiaolei4. Application of OFDR-based sensing technology in geo-mechanical model test on tunnel excavation using cross rock pillar method. , 2017, 36(5): 1063-1075.
[1] 刘泉声，徐光苗，张志凌. 光纤测量技术在岩土工程中的应用[J]. 岩石力学与工程学报，2004，23(2)：310–314.(LIU Quansheng，XU Guangmiao，ZHANG Zhiling. Application of fiber optic sensors to geotechnical engineering monitoring[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(2)：310–314.(in Chinese))
[2] 王爱民，陶记昆，李仲奎. 微型高精度多点位移计的设计及在三维模型实验中的应用[J]. 实验技术与管理，2002，19(5)：21–26.(WANG Aimin，TAO Jikun，LI Zhongkui. The design of the miniature precision multi-point displacement meter and the application in the three-dimensional model experiment[J]. Experimental Technology and Management，2002，19(5)：21–26.(in Chinese))
[3] 柴 敬，张丁丁，李 毅. 光纤传感技术在岩土与地质工程中的应用研究进展[J]. 建筑科学与工程学报，2015，32(3)：28–37.(CHAI Jing，ZHANG Dingding，LI Yi. Research progress of Optical Fiber sensing technology in geotechnical and geological engineering[J]. Journal of Architecture and Civil Engineering，2015，32(3)：28–37.(in Chinese))
[4] MENDEZ A，MORSE T F，MENDEZ F. Applications of embedded optical fiber sensors in reinforced concrete buildings and structures[J]. Fiber Optic Smart Structures and Skins II，1990，60(2)：60–69.
[5] 刘 雄. 光纤传感技术在岩土力学与工程中的应用研究[J]. 岩石力学与工程学报，1999，18(5)：588–591.(LIU Xiong. On the application of fiber optical sensor to geo-mechanics and geotechnical engineering[J]. Chinese Journal of Rock Mechanics and Engineering，1999，18(5)：588–591. (in Chinese))
[6] 刘元雪，郑颖人. 光纤检测技术及其应用于岩土工程的关键问题研究[J]. 岩石力学与工程学报，1999，18(5)：585–587.(LIU Yuanxue，ZHENG Yingren. Fiber optics detection technology and the key problems of its application in geotechnical engineering[J]. Chinese Journal of Rock Mechanics and Engineering，1999，18(5)：585–587.(in Chinese))
[7] 朱鸿鹄，殷建华，张 林，等. 大坝模型试验的光纤传感变形监测[J]. 岩石力学与工程学报，2008，27(6)：1 188–1 194.(ZHU Honghu，YIN Jianhua，ZHANG Lin，et al. Deformation monitoring of dam model test by optical fiber sensors[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(6)：1 188–1 194.(in Chinese))
[8] 朱鸿鹄，朱维申，殷建华，等. 地下开挖模型试验的光纤监测[J]. 中国矿业大学学报，2010，39(6)：826–830.(ZHU Honghu，ZHU Weishen，YIN Jianhua，et al. Fiber optical monitoring of an underground excavation model text[J]. Journal of China University of Mining and Technology，2010，39(6)：826–830.(in Chinese))
[9] 陈旭光，张强勇，段 抗，等. 基于光栅传感的模型测量系统应用研究[J]. 岩土力学，2012，33(5)：1 409–1 415.(CHEN Xuguang，ZHANG Qiangyong，DUAN Kang，et al. Research on application of optical sensors-based measuring method to model test[J]. Rock and Soil Mechanics，2012，33(5)：1 409–1 415.(in Chinese))
[10] 杨庚鑫，张 林，朱鸿鹄，等. 光纤光栅传感监测在拱坝地质力学模型试验中的应用[J]. 长江科学院院报，2012，29(8)：52–57. (YANG Gengxin，ZHANG Lin，ZHU Honghu，et al. Application of fiber bragg grating sensor in geomechanical model test of arch dam[J]. Journal of Yangtze River Scientific Research Institute，2012，29(8)：52–57.(in Chinese))
[11] 柴 敬，魏世明，常心坦，等. 岩梁变形监测的分布式光纤传感技术[J]. 岩石力学与工程学报，2004，23(23)：4 068–4 071.(CHAI Jing，WEI Shiming，CHANG Xintan，et al. Distributed optical fiber sensor for monitoring rock deformation[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(23)：4 068–4 071.(in Chinese))
[12] 解国爱，贾 东，吴晓俊，等. 构造模拟实验中的光纤应变测量[J]. 地质通报，2007，26(5)：520–525.(XIE Guoai，JIA Dong，WU Xiaojun，et al. Measurement of optical fiber strain in structural analogue modeling experiments[J]. Geological Bulletin of China，2007，26(5)：520–525.(in Chinese))
[13] 王宝军，李 科，施 斌，等. 边坡变形的分布式光纤监测模拟试验研究[J]. 工程地质学报，2010，18(3)：325–332.(WANG Baojun，LI Ke，SHI Bin，et al. Simulation experiment for distributed fiber monitoring on deformation of soil slope[J]. Journal of Engineering Geology，2010，18(3)：325–332.(in Chinese))
[14] 隋海波，施 斌，张 丹，等. 边坡工程分布式光纤监测技术研究[J]. 岩石力学与工程学报，2008，27(增2)：3 725–3 731.(SUI Haibo，SHI bin，ZHANG Dan，et al. Study on distributed optical fiber sensor based monitoring for slope engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 725– 3 731.(in Chinese))
[15] 魏广庆，施 斌，贾建勋，等. 分布式光纤传感技术在预制桩基桩内力测试中的应用[J]. 岩土工程学报，2009，31(6)：911–916. (WEI Guangqing，SHI Bin，JIA Jianxun，et al. Application of distributed optical fiber sensing to testing inner force of prefabricated piles[J]. Chinese Journal of Geotechnical Engineering，2009，31(6)：911–916.(in Chinese))
[16] 葛 捷. 分布式布里渊光纤传感技术在海堤沉降监测中的应用[J]. 岩土力学，2009，30(6)：1 856–1 860.(GE Jie. Application of BOTDR to monitoring sea dyke subsidence[J]. Rock and Soil Mechanics，2009，30(6)：1 856–1 860.(in Chinese))
[17] 张 丹，张平松，施 斌，等. 采场覆岩变形与破坏的分布式光纤监测与分析[J]. 岩土工程学报，2015，37(5)：952–957.(ZAHNG Dan，ZHANG Pingsong，SHI Bin，et al. Monitoring and analysis of overburden deformation and failure using distributed fiber optic sensing[J]. Chinese Journal of Geotechnical Engineering，2015，37(5)：952–957.(in Chinese))
[18] 丁 勇，王 平，何 宁，等. 基于BOTDA光纤传感技术的SMW工法桩分布式测量研究[J]. 岩土工程学报，2011，33(5)：719–724. (DING Yong，WANG Ping，HE Ning，et al. New method to measure deformation of SMW piles based on BOTDA[J]. Chinese Journal of Geotechnical Engineering，2011，33(5)：719–724.(in Chinese))
[19] 朱鸿鹄，施 斌，严珺凡，等. 基于分布式光纤应变感测的边坡模型试验研究[J]. 岩石力学与工程学报，2013，32(4)：821–828.(ZHU Honghu，SHI Bin，YAN Junfan，et al. Physical model testing of slope stability based on distributed fiber optical strain sensing technology[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(4)：821–828.(in Chinese))
[20] 王 飞，黄宏伟，张冬梅，等. 基于BOTDA光纤传感技术的盾构隧道变形感知方法[J]. 岩石力学与工程学报，2013，32(9)：1 901–1 908.(WANG Fei，HUANG Hongwei，ZHANG Dongmei，et al. Deformation sensing method of shield tunnel based on optical fiber sensing technology of BOTDA[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(9)：1 901–1 908.(in Chinese))
[21] 沈 圣，吴智深，杨才千，等. 基于分布式光纤应变传感技术的盾构隧道横截面收敛变形监测方法[J]. 土木工程学报，2013，46(9)：104–116.(SHEN Sheng，WU Zhishen，YANG Caiqian，et al. Convergence deformation monitoring of shield tunnels based on distributed optical fiber strain sensing technique[J]. China Civil Engineering Journal，2013，46(9)：104–116.(in Chinese))
[22] 卢 毅，施 斌，于 军，等. 地面变形分布式光纤监测模型试验研究[J]. 工程地质学报，2015，23(5)：896–901.(LU Yi，SHI Bin，YU Jun，et al. Model test on distributed optical fiber monitoring of land subsidence and ground fissures[J]. Journal of Engineering Geology，2015，23(5)：896–901.(in Chinese))
[23] 李焕强，孙红月，刘永莉，等. 光纤传感技术在边坡模型试验中的应用[J]. 岩石力学与工程学报，2008，27(8)：1 703–1 708.(LI Huanqiang，SUN Hongyue，LIU Yongli，et al. Application of optical fiber sensing technology to slope model test[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(8)：1 703–1 708.(in Chinese))
[24] 朱友群，朱鸿鹄，孙义杰，等. FBG-BOTDA联合感测管桩击入土层模型试验研究[J]. 岩土力学，2014，35(增2)：695–702.(ZHU Youqun，ZHU Honghu，SUN Yijie，et al. Model experiment study of pipe pile driving into soil using FBG-BOTDA sensing monitoring technology[J]. Rock and Soil Mechanics，2014，35(Supp.2)：695–702.(in Chinese))
[25] 王 兴，施 斌，魏广庆，等. 土木与岩土工程监测新技术——BOFDA的性能与特点[J]. 防灾减灾工程学报，2015，35(6)：763–768.(WANG Xing，SHI Bin，WEI Guangqing，et al. A novel technique for civil and geochnical engineering monitoring： performance and characteristics of BPFDA[J]. Journal of Disaster Prevention and Mitigation Engineering，2015，35(6)：763–768.(in Chinese))
[26] 柴 敬，张丁丁，李 毅. 光纤传感技术在岩土与地质工程中的应用研究进展[J]. 建筑科学与工程学报，2015，32(3)：28–37.(CHAI Jing，ZHANG Dingding，LI Yi. Research progress of optical fiber sensing technology in geotechnical and geological engineering[J]. Journal of Architecture and Civil Engineering，2015，32(3)：28–37.(in Chinese))
[27] 顾一弘. 高分辨率OFDR关键技术研究[硕士学位论文][D]. 西安：电子科技大学，2009.(GU Yihong. The research of the key of High-resolution OFDR technology[M. S. Thesis][D]. Xi?an：University of Electronic Science and Technology of China，2009.(in Chinese))
[28] 刘 琨，冯博文，刘铁根，等. 基于光频域反射技术的光纤连续分布式定位应变传感[J]. 中国激光，2015，42(5)：187–193.(LIU Kun，FENG Bowen，LIU Tiegen，et al. Continuous distributed fiber strain location sensing based on optical frequency domain reflectometry[J]. Chinese Journal of Lasers，2015，42(5)：187–193. (in Chinese))
[29] 丁振扬. 几种改进OFDR性能方法的提出及验证[博士学位论文][D].天津：天津大学，2013.(DING Zhenyang. Methods for improving OFDR performances and their experimental verifications[Ph. D. Thesis][D]. Tianjin：Tianjin University，2013.(in Chinese))
[30] FROGGATT M，MOORE J. High-spatial-resolution distrubuted strain measurement in optical fiber with Rayleigh scatter[J]. Applied Optics，1998，37(10)：1 735–1 740.
[31] 蔡志岗，靳 珂，李伟良，等. 光时域反射仪(OTDR)的研制[J]. 半导体光电，2002，23(1)：48–50.(CAI Zhigang，JIN Ke，LI Weiliang，et al. Manufacture of optical time domain reflectometer[J]. Semiconductor Optoelectronics，2002，23(1)：48–50.(in Chinese))
[32] Data sheet for OBR 4600. http：//www.lunatechnologies.com/ products/obr/files/OBR4600_Data_Sheet.pdf.
[33] 黄明利，谭忠盛，郭 家，等. 特大断面超浅埋隧道预留十字岩梁岩柱开挖技术[J]. 岩石力学与工程学报，2013，32(2)：299–307.(HUANG Mingli，TAN Zhongsheng，GUO Jia，et al. Excavation technology of super-large cross-section ultra-shallow tunnel with reserved cross rock beam-pillar method[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(2)：299–307.(in Chinese))
[34] 刘泉声，雷广峰，肖龙鸽，等. 十字岩柱法隧道开挖地质力学模型试验研究[J]. 岩石力学与工程学报，2016，35(5)：919–927.(LIU Quansheng，LEI Guangfeng，XIAO Longge，et al. Geo-mechanical model test on the tunnel excavation with cross rock pillar method[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(5)：919–927.(in Chinese))
2017, Vol. 36 
