新型预应力锚拉式桩板墙的三维有限元计算分析

3D FEM ANALYSIS ON NEW-STYLE PRESTRESSED ANCHOR SHEET-PILE RETAINING WALL

在平均坡角为30°的山区岩坡上,要求在40m宽的平台铺设三线铁轨,经过重力挡墙及架桥等方案比较,选择了新型预应力锚拉式桩板墙的结构。对该结构进行了室内地质力学模型试验,现场原位观测,二、三维有限元分析及地基约束系数法分析。对一个三维有限元程序进行了改进,计算了墙面桩的位移、内力和变形,锚固段的位移和应力,填土的土压力,锚索的拉力等。与其他方法相比,所介绍的计算结果更具合理性,为工程设计施工提供了可靠数据,也可供相关工程借鉴。

After comparison with gravity retaining wall and railway bridge, the new-style prestressed anchor sheet-pile retaining wall was selected to meet the request of laying triple-track on 40 m wide platform at rock slope of 30°. An existing 3D FEM program is improved and used to calculate the displacements, internal forces and moments of the surface pile, the displacements and stresses of the anchorage part, the earth pressures of filler, and the tension forces of anchored cabl. In comparison with other methods, such as geologic mechanics model test in laboratory, prototype observation and 2D FEM analysis, the presented calculation results seem more reasonable and can be a reference for engineering design and construction.