基于推力均匀性的盾构同步推拼油缸推力矢量控制方法研究

Study on Thrust Vector Control Method for Shield Synchronous Propulsion and Assembly Based on Thrust Uniformity

为实现推拼过程中盾构姿态精确控制,依托通苏嘉甬项目苏东隧道工程,对盾构同步推拼施工工效和油缸推力矢量控制方法开展研究,提出基于管片分块的油缸分区推力计算模型和基于推力均匀性的油缸推力矢量分配方法,对总推力大小、总推力偏心方向及偏心距对各油缸推力的影响进行分析。结果表明,在掘进速度、拼装速度和管片宽度一定的条件下,油缸行程是影响同步推拼工效的关键因素。理论上半同步推拼模式可提高工效21%以上,全同步推拼模式可提高工效47%。各油缸推力随总推力的增大先呈线性增大,后随偏心方向的变动呈非线性周期变化;偏心方向同侧的油缸推力随偏心距增大而线性增加,异侧油缸推力随之线性减少,两者合力保持不变。通过与常规推拼模式对比,提出的同步推拼算法模型在保证计算精度的同时可显著提高计算效率,符合油缸分区控制理念。

To achieve precise control of shield attitude during the synchronous propulsion and assembly process,a study was conducted on the construction efficiency and thrust vector control method of shield synchronous propul-sion and assembly,based on the Nantong-Suzhou-Jiaxing-Ningbo High-speed Railway.A thrust calculation model based on segmented lining and a thrust vector allocation method based on thrust uniformity were proposed.The effects of total thrust magnitude,thrust eccentric direction,and eccentric distance on the thrust of each cylinder were ana-lyzed.The results indicate that,under constant tunnelling speed,assembly speed,and segment width,the cylinder stroke is the key factor affecting the efficiency of synchronous propulsion and assembly.Theoretically,the half-syn-chronous propulsion and assembly mode can improve efficiency by over 21%,while the full-synchronous mode can increase it by 47%.The thrust of each cylinder initially increases linearly with the total thrust and changes non-linearly with periodic variation as the eccentric direction varies.The thrust of the cylinders on the same side as the eccentric direction increases linearly with the eccentric distance,while the thrust of the cylinders on the opposite side decreases linearly,maintaining a constant combined force.Compared to the conventional propulsion and assembly mode,the proposed synchronous propulsion and assembly algorithm model significantly improves computational efficiency while ensuring accuracy,aligning with the concept of cylinder partition control.