土压平衡盾构掘进的数学物理模型及各参数间关系研究

A mathematical model and the related parameters for EPB shield tunneling

为保证开挖面稳定及控制地面沉降,土压平衡盾构掘进时必须合理匹配各施工参数。基于模型试验结果,推导土压平衡盾构的3个基本方程式,进而得到土压平衡盾构2个总平衡方程式,建立土压平衡盾构掘进的数理模型。在此基础上推导总推力、土仓压力、螺旋机转速、掘进速度间关系的数学表达式,利用盾构施工的现场数据验证关系式的正确性。利用现场掘进数据统计刀盘扭矩、刀盘转速、土仓压力间的经验关系式。这些关系对土压平衡盾构设计时的参数选择和匹配有重要的指导意义,可以应用于土压平衡盾构施工时的参数控制。土压平衡盾构掘进的连续性方程为土压平衡盾构掘进时的地面沉降控制提供了新的研究思路。

For EPB （Earth Pressure Balance） shield tunneling, one must properly choose driving parameters to maintain face stability and control ground subsidence. Based on the data of a model test, three fundamental equations for EPB shields are derived, from which two general balance equations are developed, to form a mathematical model of EPB shield tunneling. The theoretical relationships between total thrust, in-chamber earth pressure, rotation speed of screw conveyor and advancement rate are established and validated by field data. Empirical relationships between cutter-head torque, cutter-head rotation speed and earth pressure in the chamber are thus obtained.