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《Journal of Disaster Prevention and Mitigation Engineering》 2008-02
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Distributed Optical Fiber Sensor-based Monitoring for Foundation Pit Engineering

SUI Hai-bo,SHI bin,ZHANG Dan,WEI Guang-qing,PIAO Chun-de,WANG Bao-jun (CEMOES,Department of Earth Science,Nanjing University,Nanjing 210093,China)  
Outer protective system are widely used in foundation pit,whose reinforcement quality has an important effect on the stability of foundation pit,surroundings around foundation pit. Real-time and on-line monitoring of outer protective system and surroundings around foundation pit will be useful for obtaining the deformation evolution and early-warning the foundation pit failure in time. In comparison with the routine monitoring method,distributed fiber optic sensing offers a number of attractive features,for example,distributed monitoring,long distance,real-time monitoring,long-term stability,and so on. So it fully meets the demand of the health monitoring of foundation pit and early-warning of foundation pit failure. In this paper,the measurement principle of Brillouin Optical Time-Domain Reflectometer (BOTDR) is introduced,and a novel distributed fiber optic sensor-based monitoring system for foundation pit engineering is introduced. The relative topics about application of BOTDR in foundation pit engineering are discussed in details,which include installation methods of optical fiber,optical fiber protection and temperature compensation method. Then taking a project as example,the authors analyzed the deformation monitoring data. The monitoring results show that BOTDR-based distributed monitoring system for foundation pit engineering can exactly reflect the states of deformation and has obvious advantages in terms of foundation pit deformation monitoring and real-time foundation pit failure prediction.
【Fund】: 国家杰出青年科学基金项目(40225006);; 国家自然科学基金项目(40572154)资助
【CateGory Index】: TU753
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