【摘要】 超长桩基础是土木工程领域重要的基础形式,具有高承载、超长桩长的特点,其极限荷载判定的费用高、耗时长、困难大.采用了静载荷试验的堆载法、自平衡法、有限元荷载增量法和有限元强度折减法对某超长桩基础的极限荷载判定进行研究,分析了极限荷载下桩顶位移和桩端端阻力的变化情况.研究表明:有限元强度折减极限分析方法较适用于超长桩基础极限荷载判定,所采用的屈服准则、判定条件适用于超长桩基础的极限分析,计算结果反映了超长桩基础极限承载特征,可以为桩基础的初步设计阶段和载荷试验设计提供必要参数.更多还原

【Abstract】 Super-long pile foundation is an important foundation type in civil engineering.It has the characteristics of high load-bearing and overlength pile length,but the estimation of ultimate load is costly,time-consuming and difficult.The heaped method of static load test,self-balanced method,incremental load method and strength reduction method are applied to study the estimating ultimate load of a super-long pile foundation,and the change of pile top displacement and pile end resistance under ultimate load are analyzed.The results show that the strength reduction method of ultimate load is suitable for the judgment of ultimate load of super-long pile foundation,the yield criterion and the criterion are applied to the limit analysis of super-long pile foundation suitably,and its computing solutions reflect the ultimate bearing capacity mechanism of super-long pile foundation.This method can be used to provide designing parameters for the initial design and load test design of super-long pile foundation.更多还原