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Applications of FBG-based sensors to ground stability monitoring 预览

Key technologies and risk management of deep tunnel construction at Jinping Ⅱ hydropower station
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摘要 Over the past few decades, many optical fiber sensing techniques have been developed. Among these available sensing methods, optical fiber Bragg grating(FBG) is probably the most popular one. With its unique capabilities, FBG-based geotechnical sensors can be used as a sensor array for distributive(profile) measurements, deployed under water(submersible), for localized high resolution and/or differential measurements. The authors have developed a series of FBG-based transducers that include inclination, linear displacement and gauge/differential pore pressure sensors. Techniques that involve the field deployment of FBG inclination, extension and pore-pressure sensor arrays for automated slope stability and ground subsidence monitoring have been developed. The paper provides a background of FBG and the design concepts behind the FBG-based field monitoring sensors. Cases of field monitoring using the FBG sensor arrays are presented, and their practical implications are discussed. The four diversion tunnels at Jinping Ⅱ hydropower station represent the deepest underground project yet conducted in China, with an overburden depth of 1500-2000 m and a maximum depth of 2525 m.The tunnel structure was subjected to a maximum external water pressure of 10.22 MPa and the maximum single-point groundwater inflow of 7.3 m~3/s. The success of the project construction was related to numerous challenging issues such as the stability of the rock mass surrounding the deep tunnels, strong rockburst prevention and control, and the treatment of high-pressure, large-volume groundwater infiltration. During the construction period, a series of new technologies was developed for the purpose of risk control in the deep tunnel project. Nondestructive sampling and in-situ measurement technologies were employed to fully characterize the formation and development of excavation damaged zones(EDZs), and to evaluate the mechanical behaviors of deep rocks. The time effect of marble fracture propagation, the brittleeductileeplastic transition of marble, and the temporal development of rock mass fracture and damage induced by high geostress were characterized. The safe construction of deep tunnels was achieved under a high risk of strong rockburst using active measures, a support system comprised of lining, grouting, and external water pressure reduction techniques that addressed the coupled effect of high geostress, high external water pressure, and a comprehensive early-warning system. A complete set of technologies for the treatment of high-pressure and large-volume groundwater infiltration was developed. Monitoring results indicated that the Jinping II hydropower station has been generally stable since it was put into operation in 2014.
作者 An-Bin Huang Chien-Chih Wang Jui-Ting Lee Yen-Te Ho An-Bin Huang;Chien-Chih Wang;Jui-Ting Lee;Yen-Te Ho;Department of Civil Engineering, National Chiao Tung University;
出处 《岩石力学与岩土工程学报:英文版》 CSCD 2016年第4期513-520,共8页 Journal of Rock Mechanics and Geotechnical Engineering
关键词 测试技术 锦屏水电站 深埋隧道 风险管理 隧道施工 锦屏二级水电站 外水压力 地下水流 Jinping II hydropower station Deep tunnels High geostress High external water pressure Rockburst Ground water
作者简介 Corresponding author.Tel.:+886935031129.E-mail address:cc.wang.nctu@gmail.com(C.-C.Wang).
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