考虑封底混凝土共同作用的群桩基础承载性能研究

Study on the bearing capacity of large pile foundation considering the interaction of the bottom concrete

结合长江某特大桥工程实例,用三维有限元方法反演得到封底层"型钢混凝土"的材料参数,建立了群桩基础计算模型,通过对比研究两者分布规律的差异,结果表明强大的封底混凝土体系对提高群桩基础的整体性、改善承台的受力条件和群桩基础的传力机理、削弱群桩效率的不利影响具有重要的意义。

With the example of a bridge in the Yangtze River,the material parameters of the'steel reinforced concrete'in the bottom layer are obtained by finite element method. Two computation models were established,comparing the difference. Research shows: the bottom sealing concrete system is goof for factors as follows,improving the integrity of pile cap group pile foundation,weakening the adverse effect of pile efficiency.