The survey of ground surface settlement caused by cut and cover tunnel excavation in Tabriz subway

The ground surface settlement is one of the most important events caused by excavation that has been studied by many international researches in order to control and limit its effect. This article investigates the effect of excavation for cut and cover tunnels on surface settlement of adjacent ground in Tabriz subway. At the first this article discuses about theories based on experimental results concerned the similar studies carried at the various projects in big cities. Then measurements of ground settlement in part of Tabriz subway that was obtained from local surveys was shown. Later with comparison of the analytical results with plaxis and in-situe data, the property of the soil has been obtained. The precise level, which was obtained from regional organization, was used for measurement of ground settlement. According to the obtained results from measurements, maximum settlement of taken points was 9.95mm. The calculated amount of settlement from plaxis was more than results of local surveys, which could be due to lack of reliance on laboratorial parameters of soil. At the end of article soil real parameters with use of back analysis has been obtained. Measured settlement values are in the range of the other researchers results. (A) This paper was presented at Safety in the underground space - Proceedings of the ITA-AITES 2006 World Tunnel Congress and the 32nd ITA General Assembly, Seoul, Korea, 22-27 April 2006. For the covering abstract see ITRD E129148. "Reprinted with permission from Elsevier".