DESIGN CRITERIA FOR AGF-METHOD

Abstract

During the construction of tunnels under poor soil conditions, the long-fore-piling method is often employed as an adjunct construction technique to stabilize the tunnel face and to prevent the ground settlement. This paper proposes criteria for designing the geometry of pile section employed by the AGF (All Ground Fasten) method which is one of the long-fore-piling methods. The applicability of the design criteria proposed in this paper is discussed by examinng the measured data from four tunnels constructed by the AGF method.