Evaluation of Fire-Resistance Performance of Shield Tunnel RC Linings Using Polypropylene Fiber
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In recent years, a number of catastrophic tunnel fires such as the Euro tunnel, the Mont Blanc tunnel, the Tauern tunnel and the Gotthard tunnel, have occurred and inflicted serious damages to European countries. If a fire occurs in shield tunnels, the reinforced concrete segment linings playing as an important structural member is expected to be damaged severely and finally can induce the collapse of tunnel. The purpose of this study is to evaluate the performance of concrete segment lining under heat exposure and to obtain information to assist a new technical approach to fight fires in tunnels. In order to evaluate the fire-resistance performance of concrete segment by adding Polypropylene fibers, fire tests using the RABT heat-load curve is carried out. The temperature rise of this curve is very rapid up to 1200 within 5 minutes, and duration time of the 1200 exposure is 55 minutes. From the fire test, it was found that the explosive spalling was rapidly reduced by adding polypropylene fibers and this can be considered as an effective fireproof approach to upgrade fire safety in tunnels economically.