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  Monitoring and Characterization of Water Leakage Behavior for Aged Concrete Lining of Urban Metro Lines by Using Plastic Optic Fiber Sensor

  A series of laboratory tests and field measurement were conducted to monitor water leakage behaviour from cracked concrete wall for an aged subway tunnel. Tokyo Metro, operating a total of 195km of urban rail networks of which 167km is underground, regards important that water leakage behaviour be appropriately grasped over time such that periodical manual investigation and the following maintenance works can be properly planned and executed. A new plastic optic fiber sensor designed for water leakage detection was proven to be effective for practical use in underground environment for more than one year and the general trend of water leakage identified by this sensor was found to be in accordance with the experience acquired over the years.

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