ABSTRACT
A new thrust system adopting hydraulic transformer is designed in this work. The schematic diagram of a single grouped thrust system is shown in Figure 1. When the machine stops tunneling ahead,
1 INTRODUCTION
With rapid development of big cities and the sustaining expansion of transport systems and the existing infrastructure, demands of underground space exploration and utilization have been reasonably growing. In order to satisfy the updating demands, it is significantly necessary to develop the safe, inexpensive and highly efficient technology for tunneling.
