Shigen-to-sozai, Vol.116, No.12, pp.979-987.
Study on Prediction Equation of Thrust in
Curved Jacking Area
―Estimation of thrust in using shurry pipe-jacking
(2nd Report) ―
Hideki SHIMADA1, Masafurni INOUE1, Takashi SASAOKA1, Shiro KUBOTA1 and Kikuo MATSUI1
| 1. Graduate School of Engineering, Kyushu University, Higashi-ku, Fukuoka 812-8581 |
| 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. |
| KEY WORDS: Slurry Pipe-jacking, Thrust, Curved Jacking, Prediction Equation, Mud Slurry, Mud Screen |