论文部分内容阅读
本文利用有限差分法及有限元法分别计算了无限高和有限高冻结壁的蠕变问题。对于非均匀冻结壁,其切向应力及垂直应力的最大值出现在轴面处。对于无限高冻结壁模型,变形量随掘进段高及暴露时间的增加而增加。有限高冻结壁内壁上最大的径向变位发生在略高于二分之一段高的部位。在混凝土衬砌底部,冻结壁内出现了严重的应力集中现象。
In this paper, the finite-difference method and the finite element method are used to calculate the creep problems of infinitely high and finitely high frozen walls, respectively. For non-uniform frozen walls, the maximum of tangential stress and vertical stress occurs at the axial plane. For an infinitely high frozen wall model, the deformation increases with the height of the excavation section and the exposure time. The maximum radial displacement on the wall of a limited high-freezing wall occurs at a position slightly higher than one-half of a segment. At the bottom of the concrete lining, serious stress concentration appeared in the frozen wall.