터널굴착에 의한 주변말뚝의 거동 분석

Three-dimensional (3D) numerical modelling has been conducted to study the effects of tunnelling on an adjacent single pile above the tunnel. In the numerical analysis pile behaviour associated with tunnelling on weathered soil and rock has been investigated. In particular, the effect of pile position with respect to the tunnel location on the pile behaviour has been analysed. The study includes ground settlement trough, pile settlement, axial forces and shear stresses on the pile. Due to the reductions in vertical stress below the pile tip and ground settlement, pile settlement was induced, thereby changing shear transfer mechanism. The numerical modelling results show that the longer the distance from the tunnel crown, the smaller the effects of the tunnelling on the pile behaviour. Some insights into the pile behaviour under the influence of tunnelling obtained from the numerical analysis will be reported and discussed.