shield excavation meaning in English

盾构掘进

For shield excavation the scope of reinforcement is determined either in vertical direction along the tunnel or in radial direction at its starting position
摘要盾构始发预加固范围的确定，一则是沿隧道纵向的加固范围确定，二则是盾构径向加固范围的确定。
The direction guidance system plays an important part in the shield excavation , such as the prevention of snake motion , the reduction of ground settlement of tunnel construction and the insurance of tunnel quality etc . based on the principle of guidance system , a precise direction guidance system with high accuracy , high efficiency and more reliability is developed , it has the advantages of less times of surveying , real time positioning and shield behaviors monitoring
盾构导向系统是盾构掘进时的指挥系统，对指导盾构掘进、隧洞贯通、减少地表沉降以及保证隧洞的质量等具有重要的作用。本文在研究盾构导向工作原理的基础上开发研制了一套盾构导向系统，精度高、工作可靠，可极大地缩短导向测量的时间和减轻劳动强度，实现了盾构掘进的实时定位和姿态监测。