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MONITORING OF PROVISIONAL STRUCTURE OF A -CUT AND COVER- TUNNEL
Abstract
First part of the paper presents the monitoring project of Turdas tunnel with the detailing of the monitoring equipment. Building of Turdas tunnel was realized for ensuring the maximum speed of 160km/h for passenger trains. In order to build the tunnel was provided a provisional support and a final support, due to difficult field conditions, obtained from the geotechnical studies, because of the presence of the swelling soil. To achieve safe construction of the tunnel were mounted specific monitoring equipment in the provisional and final structure. The provisional structure is composed from molded walls and struts. For molded walls were mounted strain gauges and inclinometers and for struts were mounted load cells. For the final structure composed from an invert and lining were provided strain gauges correlated with the envelope of sectional efforts. In the second part of the paper are presented the results of the monitoring from the provisional structure in different phase of execution which are compared with the results from initial project. Finally the monitoring results are calibrated with the real phases of execution.
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