英文篇名
Integrated pore water pressure and displacement profile monitoring in ground
作者
黃安斌、王建智、莊子賢、李瑞庭、何彥德
關鍵字
光纖光柵、現地監測、地層位移、孔隙水壓、地層下陷
摘要
地層內孔隙水壓與移動量之變化是許多大地工程現地監測中重要參數。將相關感測器混合串接,在單一鑽孔內同時獲得這些物理量之剖面資訊,則更能發揮監測之效益。光纖光柵具有體積小、耐久性高、訊號可長距離傳輸而不受電磁波干擾,同時可以在同一光纖上做多點分佈式的監測技術。作者於交通大學光纖感測試驗室研發成功一系列光纖光柵感測技術,包括節理式偏斜儀、測傾儀、水壓計及伸縮計等。將不同功能之光纖光柵感測器整合串接,安裝在同一鑽孔,可用來做即時水壓、橫向位移及沉陷分佈監測。本文敘述相關光纖光柵監測原理以及應用這些技術做邊坡、堤防安全及地層下陷監測之案例。
英文摘要
The variations of pore water pressure and displacement in ground are important parameters in many geotechnical engineering field monitoring. Combining multiple sensors with different functions into an array enables profile information to be obtained in a single borehole and enhance its effectiveness. Optical fiber Bragg Grating (FBG) has the advantages of being minute, durable, immune to lightning, electromagnetic interference and short circuit, and capable of connecting multiple FBG’s using a single optical fiber. The optical signal can be transmitted to tens of kilometers away without losing its quality. The authors at the optical fiber sensor laboratory of National Chiao Tung University have developed a series of FBG sensing techniques that include segmented deflectometer, inclinometer, piezometer, and extensometer. Integrating various types of FBG sensors and insert them into the borehole as an array, the authors were able to perform real-time pore water pressure, lateral displacement and subsidence profile monitoring. The paper describes principles of these FBG sensing techniques and cases of field deployment of FBG sensor arrays for slope stability, dike safety, and ground subsidence monitoring.