3차원 수치해석모델을 이용한 쉴드TBM 굴착시 막장압에 따른 지반 및 라이닝의 거동 분석

Abstract

In tunnelling the enginner is challenged by the save and economic design fo the tunnel lining. Simplificaitions of the complex spatial structure and the non-liear material behaviour in analytical procedures often lead to overdimensioned solutions. Numerical computation in order to simulate the three-dimensional geometry and the interaction between lining and soil in applied to achieve economic design results. In this study a three-dimensional numerical model is used by the finite-element program MIDAS-GTS to simulate the tunnel driving with a shield machine. As basis for the numerical model the typical characteristics of an EPB-Shield (Earth Pressure Balanced Shield) was used. With the numerical model several calculations have been carried out. Base on the above numerical model, this paper forcuses on the ground surface movements, particularly the transverse and longitudinal settlement profiles during shield tunnel construction. With settlement calculations especially the influence of the injection pressure of the gap backfilling and the face pressure was investigated.