Kouichi KUBOTA

Study on earth pressure and hydraulic pressure acting on segment at deep ground by ground spring model which can represent active earth pressure

Mitsutaka SUGIMOTO

At deep ground, it is found sometimes that active earth pressure is loaded on segments because of the stiff ground with higher self-stabilization and the shortage of back-fill grouting. However, the present design method of shield segments can not consider active earth pressure.

The purpose of this research is to simulate the site date by the new model with the ground spring model which can represent active earth pressure and back-fill grouting rate, and to understand the interaction between ground and segments, in deep ground. As a result, the validity of this model was confirmed, and the followings were made clean. 1) This model can simulate the measured earth pressure and hydraulic pressure acting on the segment at the sites. 2) The effective earth pressure acting on segments, displacement, axial force and bending moment by this model is smaller, compared with that by the existing model.