论文部分内容阅读
基于工程实例,利用ANSYS有限元数值模拟方法,深入分析了地铁隧道开挖对临近建筑物墩基础的影响。研究结果表明:地铁隧道施工会引起墩侧摩擦阻力和墩底段轴力的变化。墩侧摩擦阻力沿墩身的分布由上而下表现为正摩擦阻力区、中性点和负摩擦阻力区;墩底段轴力随隧道开挖逐渐减小,而后受滞后的墩侧负摩擦阻力的影响表现为拉力且随深度的增加而逐渐增大。此时墩对隧道拱部围岩起“悬吊”作用,但对其自身的危害极大。
Based on the engineering examples, the influence of subway tunnel excavation on the foundation of adjacent buildings is deeply analyzed by ANSYS finite element numerical simulation method. The results show that the subway tunnel construction will cause the friction on the pier side and the change of the axial force at the bottom of the pier. The distribution of the friction along the piers along the piers shows a positive frictional resistance zone, a neutral point and a negative frictional resistance zone from top to bottom. The axial force at the bottom of the piers decreases gradually with tunnel excavation, The effect of drag is manifested as a pulling force and gradually increasing with depth. At this moment, the pier plays a role of “hanging ” around the tunnel arch, but it is very harmful to itself.