Abstract: A case study on the 3rd bid section of the Shanghai airport railway link line is presented to effectively shorten the construction period by deploying only one shield in a longdistance shield tunnel. On the premise of keeping the operation habits of shield drivers unchanged, a synchronous technology combining shield tunneling and segment assembling with closedloop active control on the cylinder pressures of the shield propulsion system is developed, which can maintain the stability of the total thrust force vector. Then, a redistribution calculation method of the missing jacking force is proposed based on the principle of uniform loading on a single segment. Finally, a largescale test platform with a similarity ratio of 1/2 is established to verify the whole set of the synchronous technology. The test results show the following: first, the error of the total thrust force is controlled within ±4%. Second, the horizontal and vertical deviations of shield posture are controlled within ±12 mm. Third, the driving speed of the shield ranges from -6 to +6 mm/min of the set value. Finally, the compressive safety factor of the segment structure reaches 213.

Key words: shield machine, shield tunneling, segment assembling, synchronous technology, test platform