Development and Application of a Model Test Platform of Synchronous Technology Combining Shield Tunneling with Segment Assembling

doi:10.16183/j.cnki.jsjtu.2021.241

Abstract

Abstract:

Taking a running tunnel of Shanghai Railway Airport connecting line as a demonstration application project, the synchronous technology combining shield tunneling with segment assembling is proposed based on the active control on the oil pressure of the shield thrust system, which can solve the problem of the long construction period produced by a single shield machine employed in a long-distance shield tunnel project. The principle is to make full use of the extra stroke of propulsion cylinders generated by the axial insertion of the key block to assemble segments, and the theoretical operation time of a single ring can be reduced by 31.6%. Then, a large model test platform for this synchronization technology is established to verify its feasibility and reliability, and the redistribution method of the missing thrust force is introduced during the synchronous process, which is verified by the model test. The test results show that the actuators of the shield machine respond quickly, and the errors of the cylinder pressures and total thrust force of the propulsion system are controlled within ±2%. The attitude deviation of the shield machine is controlled within ±6 mm, and the error range of the driving speed is -2 to 4 mm/min. The segments are safe with the designed overburden thickness of 33 m, and the compressive safety coefficient reaches 1.68.

Key words: shield machine, shield tunneling, segment assembling, synchronization, test platform

CLC Number:

U451.5

ZHU Yeting, MIN Rui, QIN Yuan, WU Wenfei, YUAN Peng, ZHAI Yixin, ZHU Yanfei. Development and Application of a Model Test Platform of Synchronous Technology Combining Shield Tunneling with Segment Assembling[J]. Journal of Shanghai Jiao Tong University, 2022, 56(7): 897-907.

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序号	施工参数	控制范围
1	推进系统油压	±2%
2	盾构总顶推力	±2%
3	盾构总顶推力合力矩	±4%
4	盾构姿态偏差/mm	±12
5	盾构推进速度偏差/(mm·min^-1)	-4~+8
6	管片结构抗压安全系数	1.68