长-短桩复合地基性状影响参数弹塑性有限元分析

运用三维弹塑性有限元方法分析带垫层的长短桩复合地基中承台垫层桩土系统的共同作用机理。计算表明,在一定范围内,刚性长桩长度、刚性桩边长、柔性桩刚度、刚性短桩长度和垫层弹性模量增加,都会使基础沉降减小。长桩长度增加,长桩的荷载分担比明显增加;刚性桩边长和垫层弹性模量增加、垫层厚度减少,刚性桩的荷载分担比都会增加;刚性短桩长度加长,短桩的荷载分担比明显增加。根据分析结果提出了行之有效的基础沉降控制方法。工程实测数据表明有限元分析结果和提出的基础沉降控制方法是有效的

Elastic-plastic Finite Analysis on the Behavior of Long-short Composite Piled Foundation with Cushion

The elastic-plastic finite element method was applied to study the behavior of long-short composite piled foundation with cushion. The calculation results show that the settlements of foundation decrease with the increasing of the length of rigid long piles, section of rigid piles, rigid of flexible piles, length of rigid short piles, elastic modulus of cushion; the sharing load of long pile increases with the increasing of the length of it; the sharing load of rigid pile increases with the increasing of the section of it and the elastic modulus of cushion; the sharing load of short pile increases with the increasing of the length of it. The methods to control the settlement of foundation based on the analysis are presented, and proved to be effective by test data in engineering practice.