基于ANSYS的地铁车站深基坑支护设计

针对广州地铁三号线永泰站深基坑平面尺寸较长，地下溶洞较多，地质条件较差的特点，制定了地连墙和内支撑相结合的基坑支护方案，以确保基坑和周围建筑物的安全。通过ANSYS建立三维有限元模型，分析了地连墙厚度、内支撑刚度和预加轴力等主要因素对于基坑变形的影响，并根据地连墙厚度和内支撑刚度与墙体最大位移的关系曲线，确定了地连墙厚度和内支撑刚度的合理取值，同时调整钢支撑的预加轴力值，使地连墙的最大侧移值控制在允许的范围内。从施工监测结果可以看出，地连墙侧移和基坑周边沉降基本都在30mm左右，表明本基坑支护方案合理可行，可为同类工程提供参考。

Deep foundation pit support design of the subway station based on ANSYS

The foundation pit support scheme of diaphragm with inner support was made according to the characteristics of Yongtai station for Guangzhou metro line, where the deep foundation pit was long and with many underground karst caves and bad geological conditions. The effect of the major factors to the diaphragm deformation, including the thickness of diaphragm, the stiffness of the inner support and the pre-axial force, were analyzed by use of the ANSYS. The thickness of diaphragm and the stiffness of inner support are confirmed according to the relationship curves of the two versus the maximum displacement. And then, the pre-axial force of the steel support is adjusted to make the maximum displacement of diaphragm acceptable. The monitoring results show that the displacements of the diaphragm and the settlement are about 30mm, therefore the supporting scheme of the deep excavation is reasonable and can serve as a reference for similar projects.