Numerical Analysis on Non-Uniform Thrust System in EPB Shield Machine Applied in Beijing Metro Line 6

Kongshu Deng,Lu Zeng,Yicheng Ding,Zhurong Yin

doi:10.1109/access.2019.2956317

Abstract

This paper is to investigate the mechanical characteristics of non-equidistant thrust system in an EPB shield machine with a diameter of 6.15 m applied in Beijing Metro Line 6 construction. Firstly, on the ground of tunneling condition, virtual prototypes for traditional even system and the non-equidistant one have been built. Under the same given working conditions, simulation forces from three jacks in two systems have been compared with those numerical ones. Secondly, based on relative coefficient mode, comparison of force transmission performance between traditional even thrust system and the non-equidistant one have been discussed. Finally, the effects from all forces applied by the two kind of different layouts thrust systems have been studied using finite element method. The results shown that the non-uniform thrust system in the EPB shield machine applied in Beijing subway construction has more significant advantages in the aspects of forces transmission performance and the prevention of the collapse of the lining segments.

Highlights

The shield machine, as a kind of irreplaceable engineering equipment for tunnel construction, has an important effect on the process of building subway tunneling to relief the urban surface traffic pressure [1]
In this paper, mechanical characteristics for the nonequidistant thrust system in the EPB shield machine applied to Beijing Metro Line 6 have been investigated
The virtual prototypes for them have been built and all forces for the thrust systems have been discussed between numerical model and simulation model under the same working conditions

Summary

INTRODUCTION

The shield machine, as a kind of irreplaceable engineering equipment for tunnel construction, has an important effect on the process of building subway tunneling to relief the urban surface traffic pressure [1]. K. Deng et al.: Numerical Analysis on Non-Uniform Thrust System in EPB Shield Machine Applied in Beijing Metro Line 6. K. Deng et al.: Numerical Analysis on Non-Uniform Thrust System in EPB Shield Machine Applied in Beijing Metro Line 6 FIGURE 3. By comparing the forces applied by 10th, 20th and 24th hydraulic cylinders in the same propulsion system, it is easy to find that the three thrust values of the uneven propulsion system have a smaller range from 690 kN to 715 kN It implies that external forces transferred by the nonequidistant system are more uniform and the power resource in the EPB shield machine could provide more even power for each jack in the non-equidistant thrust system. Anti-eccentric load performance for the non-spacing thrust system is much better than that of uniform layout

FINITE ELEMENT ANALYSIS OF SEGMENTS LOADED FROM THRUST SYSTEM

CONCLUSION