砂地盤の非線形性・構造異方性を考慮したトンネル掘削挙動予測手法の開発

抄録

For more efficient use of underground space in urban areas, tunnels close to existing important structures are increasingly constructed. This demands more accurate estimation of ground movement due to tunneling works and its unfavourable effect on the adjacent structures. In order to analyze the behaviour of sand ground due to tunneling in a more realistic manner, an analytical method was developed which takes into account the pressure-dependency, anisotropy and non-linearity of stiffness of sand. It is demonstrated that this method can simulate laboratory model test results substantially better than the conventional linear elastic analysis method.