Research On Ground Subsidence Caused By Shield-driven Construction And Buildings Protection

With the development of the modern construction in urban, more and more tunnel projects have appeared and the environment of construction has been more complex. Shield tunnel construction is one of the most advanced construction methods of the tunnel construction. It has smaller impact on the surrounding environments and has been widely used. A reasonable forecast of ground subsidence in shield tunnel project during construction and project normal operations is very important. It has great theoretical significance to shield tunnel normal construction and the existing buildings and underground pipelines protection, can be used to refer and guide.In this paper we analyze the ground subsidence date which based on the shield-driven construction of Wuhan Yangtz River tunnel project. First, according to cross-sectional ground subsidence data, we calculate i and Vl oss which are the parameters of the Peck formula for Wuhan and analyze the cross-sectional subsidence principle. Secondly, according to the measured subsidence data from November 2006 to April 2007, we discuss the changes principle of ground subsidence with time caused by the shield-driven tunnel construction by using of the various long-term forecasting model of the ground subsidence. We determine the most appropriate long-term forecasting model of the ground subsidence for this project by comparing the measured date with forecast date. Finally,according to the principle of ground subsidence, we study the extent of the surrounding buildings affected by the shield-driven tunnel construction, analysis the damage of important buildings and give the appropriate measures to protect buildings.