广义复合基础的概念和工程实践

METHOD AND APPLICATION OF GENERALIZED COMPOSITE FOUNDATION STRUCTURE

上部结构、基础、地基(含桩基)始终是一个共同作用着的整体,衡量这个整体是否安全可用,主要看建筑物的平均沉降与差异沉降是否满足要求。研究表明:对地基(含桩基)的支承刚度的大小和分布进行合理的调整是差异沉降控制设计最有效的方法。在此基础上提出了广义复合基础的概念,并对地基土承载力的合理取值进行讨论,同时给出了几种对地基支承刚度进行合理分布的方法,尤其是自适应变形调节器的研制,为解决端承桩复合桩基应用的难题提供了可能性。工程实例的成功应用表明:该文提出的广义复合基础的设计方法和相应的变形调节装置具有广阔的应用前景。

The superstructure and foundation (including the pile foundation) and subsoil of buildings are always holistic in their interactions. In order to judge the safety and feasibility of the entire system, the average settlement and difference settlement of buildings must meet the design requirements. Long-term investigations show that the most effective measure is the disposal and adjustment of the bearing stiffness of subsoil as well as the difference settlement control for the pile foundations. Consequently, the concept of generalized composite foundation is discussed. The reasonable determination of the capacity of soil foundations and some methods to disposal and adjust the bearing stiffness of subsoil as well as pile foundations are presented. Especially, the settlement adjustor installed at the top of piles is developed, which solves the question of applications of end-bearing composite foundation. Successful applications of practical projects in situ indicate that the design method of generalized composite foundation and the corresponding settlement adjustor are wide promising.