嵌岩桩的优化设计方法研究

Research on optimization design of rock-socketed piles

结合结构最优化设计概念和有限元分析,建立了嵌岩桩优化数值模型,提出了嵌岩桩目标优化设计的方法.与传统设计相比,通过对嵌岩桩进行桩径和嵌岩深度优化设计可满足桩沉降和承载力的双控要求,使桩端阻力、桩侧阻力能最大限度地得到发挥,有效减少工程投资.以ABAQUS有限元软件为平台,可以成为解决嵌岩桩实际工程问题的个性化工具和仿真研究环境.利用它可以模拟嵌岩桩成桩基本过程,分析嵌岩桩荷载—沉降特性,并对嵌岩桩进行了优化设计.

A method for optimization design of rock-socketed piles by establishing its numerical modeling is presented. The proposed method is a combination of finite element analysis and structure optimization technique. By optimizing the pile diameter and pile rock-socketed length, the allowable settlement and bearing capacity not only have been satistied, but also the side friction resistance and the end resistance of piles can be exerted. The cost of the foundation for rock-socketed piles is found to be more economical than adopting the common design method. All approaches show that the finite element analysis software ABAQUS can become the special implement and simulation environment to solve the engineering problem of rock-socketed piles. Based on the ABAQUS, we can simulate the process of forming rock-socketed pile and analyze the load-settlement characters of rock-socketed piles, also optimize the pile diameter and pile rock-socketed length. The results are great meaningful both in scientific research and in engineering application fields.