Abstract
Recently, for the concern of safety in construction as well as for environmental and economical reasons, an efficient small-diameter shallow tunneling method has become increasingly important for outside plant engineering such as water supply, gas, electricity and telecommunications. In particular, for construction work near existing facilities, an underground tunnel excavated by the slurry pipe-jacking is becoming increasingly popular to avoid adverse effects.
The difference of the thrust between linear jacking and curved jacking is due to the frictional force of outside components of the curved area of thrust. It is considered that if the use of mud slurry on the face and over-cutting area is successful, lower increased ratio of the thrust is obtained in the curved jacking by in-situ data. However, in order to establish a more useful prediction equation in the curved jacking, more research and field data are needed. From this point of view, the purpose of this paper is to discuss the prediction equation in order to better explain the characteristics of the thrust and the friction resistance in the curved jacking by using laboratory testing and field data.
