Monitoring of Stray Current Interference in the Reinforced Concrete Structures of the Turin Underground Railway Loop
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Abstract
Abstract The town of Turin represents an important railway junction in North Italy. Starting from beginning of nineties, the main railway lines which originally ran on surface through the town, have been deeply revamped and transferred underground, returning a huge green area to the town and reducing the traffic on surface. Significant civil works have been needed, performed in a very crowded urban area, to create a railway underground loop several kilometres long, consisting of up to three parallel tunnels located on two levels underground and with railway stations distributed along the route. All the concrete structures are exposed to DC stray currents coming from the new underground railway lines and from pre-existing lines on surface. Together with some interventions performed to minimise stray currents and their effects, a monitoring system has been designed and installed, with permanent reference electrodes embedded in the concrete structures at critical location. The paper illustrates the design of the monitoring system, the methods and criteria adopted. Results obtained in the commissioning phase are reported.
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