为解决长距离盾构隧道项目单台盾构掘进工期过长的问题,以上海市域铁路机场联络线某区间隧道为示范应用工程,开发了基于推进系统油压主动控制理念的盾构推拼同步施工技术.其原理为通过充分利用轴向插入封顶块产生的推进油缸行程富余量进行管片拼装作业,单环管片的作业时间理论上可缩短31.6%.为验证推拼同步技术的可行性与可靠性,构建超大直径盾构推拼同步技术模型试验平台,给出了推拼同步过程中缺失顶力的再分配计算方法,并对该技术进行了模型试验验证.试验结果表明:模型盾构机执行机构响应迅速,推进系统油缸压力和总顶推力误差均控制在±2%以内;盾构姿态偏差控制在±6 mm范围内,盾构推进速度误差范围为 -2~4 mm/min;管片结构受力安全,设计覆土33 m条件下管片抗压安全系数可达1.68.

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.