Formation Stability And Construction Process Of The Cross-harbour Tunnel Shield Docking Segment Mechanical Properties

The shield driving method, as one of the main construction methods of tunneling, has been used widely in China. But there are still a lot of problms need to be solved in this method.The first problem is:Docking long tunnel shield has its natural advantages, but the corresponding technical difficulty is relatively large. Guangzhou Ocean undersea tunnel Lions first time in China a shield docking methods. Shield when the rock is stable docking? Choose what kind of docking the most scientific method? In this paper, the Lions Western Harbour tunnel in Guangzhou for the engineering background, as the main means of centrifugation experiments, combined with numerical simulation analysis on this issue was also discussed and reached some interesting conclusions.The second question is:Shield project, lining segments of the investment project investment usually accounts for 30 to 40%, which is affecting the construction economy and structural safety of the important factors. However, under the same conditions, our shield segment thicker than a lot of foreign countries, steel is also used a lot more. Segment of the shield design is not too conservative? Can the basis of scientific analysis to further reduce the cost? Through field tests and numerical analysis, seeks to explore the true shield segment out the forces for the design of shield segment to provide scientific guidance. The main results are as follows:1:Shield segment on a large number of experimental work carried out to obtain Shield, bolts actual stress situation;2:Combined with the measured data, using beam joints are not continuous model, the force shield segment numerical simulation and compared with the measured;3:Centrifuge test of the theory, determine the centrifugal acceleration of the centrifuge test and completed a similar material surrounding the tunnel structure similar to the material preparation, model making and related machinery and equipment production;4:China Institute of Water Resources and Hydropower by centrifuge, the centrifugal working face shield docking experiments focused on the stability of tunnel face shield docking and force the situation. Obtained when the stability of surrounding rock shield butt Some meaningful conclusions.