盾构推进液压系统控制模式的分析比较

盾构为隧道施工的重大技术装备,推进系统性能的好坏直接影响盾构姿态、施工开挖隧道线路的精准度以及掘进速度。盾构在软弱地层的施工过程中,某些盾构容易出现姿态控制困难及"栽头"现象,文章通过对不同厂家推进系统控制模式进行研究及原因分析,从理论上与实际监测进行比较得出结论。就目前国内外盾构产品而言,推进液压系统控制模式主要有2种,比例压力流量复合控制方案和比例减压阀控制方案,通过AMESim仿真、理论分析,并结合现场的实际监测数据比较了2种控制模式下执行机构动态响应特性,从而对盾构的可操作性及姿态控制特性进行分析比较,以期对推进液压系统的设计及盾构的选型、使用有一定的参考价值。

Comparison of Control Modes of Hydraulic Thrust System of Shields

Shield is a key equipment for tunnel construction. The thrust system of a shield directly affects the attitude, boring alignment accuracy and advance rate of the shield. When some shield is boring in soft ground, it is difficult to control the attitude of the shield and pitch may occur. In the paper, the reasons for the above mentioned phenomenon are analyzed on basis of the control modes of the thrust systems of the shields supplied by different manufacturers. Pressure flow compound control mode and proportional pressure reducing valve control mode are two major control modes of hydraulic system of shields. The dynamic response of the actuating mechanism of shields under the two mentioned control modes are compared by means of AMESim simulation, theoretical analysis and monitoring data analysis, so that the characteristics of the operability and attitude control of shields can be analyzed and compared. The paper can provide reference for the design of the hydraulic thrust system of shields, as well as for the type selection and operation of shields. 