沉降控制复合桩基设计法的应用及有限元分析

Application and finite element analysis of designing method of settlement-controlled composite piled foundation

常规复合桩基设计方法通常只考虑桩的承载作用,忽略了桩间土的承载作用,使实际工程过于安全而造成不必要的经济投入。通过对软土地基的研究,提出了由容许沉降量确定桩数的复合桩基设计,即按沉降量控制的复合桩基的完整设计法,介绍了以沉降量为控制指标的设计原则和步骤,并用一个工程实例说明了该方法的计算过程,运用 ABAQUS 有限元软件对该工程进行了数值模拟计算。数值模拟计算的结果验证了该理论的合理性,最后将其与常规方法设计进行了经济比较,显示了前者有一定的经济优势。

Considering the conventional designing method of composite piled foundation only takes the bearing of piles into account. Through studying of the soft soil foundation,a complete designing method has been developed to choose the number of piles on the basis of allowable settlement for the composite piled foundation;that is,to be settlement-controlled composite piled foundation.The paper introduces the basic principles and procedures of the design method taking settlement control as the key objective.Then,the calculation process is presented by a project example;and the numerical calculation is also made by finite element software. Compared with the conventional design method it shows great economic predominance.