Numerical analysis of the influence of block geometry on the behavior of piled foundations

abstract: In recent years, engineering has significantly increased the use of numerical modeling, mainly applied in studies of solutions and analysis of the behavior of the soil - structure and foundation element interaction. In this sense, this paper analyzes the behavior of blocks foundations made up of one, two, three and four piles with 25 cm in diameter (d) and 5 m in length (L) and with unusual spacing between the piles, equal to 5d in a three-dimensional finite element numerical model (MEF-3D). The results of the numerical analyzes demonstrated an average contribution of 36% due to the block-to-ground contact in relation to the total capacity of the system. The geometry of the block influences the response in terms of load capacity and stiffness of the foundation element. These results demonstrate an opportunity to reevaluate traditional calculation requirements, with the aim of rationalizing the design of foundations, thus improving the safety of the structural system.摘要：近年来，工程领域对数值模拟技术的应用显著增多，该技术主要用于土-结构与基础构件相互作用的相关研究与行为分析。基于此，本文借助三维有限元数值模型（MEF-3D），对由1、2、3、4根直径25cm（记为d）、桩长5m（记为L）且桩间距异于常规（为5倍桩径，即5d）的桩组成的块体基础的受力特性展开分析。数值分析结果表明，块体与地基的接触作用对系统总承载力的平均贡献可达36%。块体的几何形状会对基础构件的承载力与刚度响应产生显著影响。上述研究结果显示，可重新审视传统计算要求，以期实现基础设计的合理化，进而提升结构系统的整体安全性。