1993 | OriginalPaper | Chapter
Control Surveys During the Construction of the Channel Tunnel
Author : N. Korittke
Published in: Applications of Geodesy to Engineering
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
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The Institute for Deposits and Surveying of the Deutsche Montan Technologie (DMT), Bochum, delivered 3 high precision gyrotheodolites GYROMAT to the English-French-syndicate for the construction of the tunnel under the English Channel. The GYROMATS are in use for direction-finding during the construction of the EUROTUNNEL from both sides.Furthermore, DMT surveying teams carried out control surveys both on the French and on the British side to guarantee a successful breakthrough under the English Channel in December 1990.Within 7 surveying campaigns more than 100 km of bored tunnels in the EUROTUNNEL-project were checked.The GYROMAT and the EUROTUNNEL-project will be outlined in this paper.Finally the results of the control surveys and the influence of horizontal refraction on traverse measurements in tunnels are discussed.