岩质地层盾构掘进施工控制参数分析

Analysis of Construction Control Parameters in Rock Shield-driven Tunnelling

盾构机掘进施工参数的影响因素繁多,盾构机各参数之间的相关性研究主要以理论分析为主,盾构掘进施工参数的影响因素与影响机制难以阐明。文章对大连岩质地层中土压平衡盾构掘进施工控制参数进行了收集与分析,结果表明:盾构机的总推力与顶推速度、刀盘转速与刀盘扭矩以及螺旋输送机转速与其扭矩的相关性均不显著;因岩质地层中土拱效应明显,盾壳与围岩之间的摩阻力较小,总推力主要用于提供刀盘与开挖面之间的水平相互作用力;盾构机的螺旋输送机转速与盾构机顶推速度之间的相关性显著;螺旋输送机通过转速来调整土舱饱满度,进而影响开挖面上被切削的土体进入土舱内的难易程度,因此螺旋输送机的渣土输出效率对顶推速度与刀盘扭矩影响明显。

There are many factors influencing the construction parameters in shield tunnelling,and regarding the re⁃search on correlation among the construction parameters in shield tunnelling it is mainly based on theoretical analy⁃sis.It is difficult to clarify the influencing factors and mechanism of the construction parameters in shield tunnel⁃ling.This paper collects and analyzes the construction control parameters during EPB shield tunnelling in rock stra⁃ta in Dalian,and the results show that:the correlation between the total thrust and advancing speed,the cutterhead rotation speed and torque,and the screw conveyor rotation speed and torque are all not significant;due to the signifi⁃cant soil arch effect in rock strata and thus the low frictional resistance between the shield shell and the surrounding rock,the total thrust is mainly used to provide the horizontal interaction between the cutterhead and the excavation face;the correlation between the rotation speed of the screw conveyor and the advancing speed of the shield machine is significant;the screw conveyor controls the fullness of the soil chamber through the rotation speed,influencing the excavated soils entering the chamber,so the muck discharge efficiency of the screw conveyor has a significant effect on the advancing speed and cutterhead torque.