Theoretical Study on Pile Length Optimization of Pile Groups and Piled Rafts
Theoretical Study on Pile Length Optimization of Pile Groups and Piled Rafts
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DOI：
10.1061/(asce)gt.1943-5606.0000206
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发表时间：
2010-02-01
影响因子：
3.9
通讯作者：
Soga, K.
中科院分区：
文献类型：
--
作者：
Leung, Y. F.;Klar, A.;Soga, K.
桩群通常设计成具有相等或相似的桩长。然而，等长桩之间的显着的相互作用效应意味着这可能不是最佳的配置。本文介绍了桩筏和独立桩群的优化分析，其中桩长在整个组中变化，以优化整体基础性能。分析结果适用于桩的大部分承载力来自摩擦阻力的情况。结果表明，在桩体材料总量相同的情况下，优化的桩长配置既能提高基础的整体刚度，又能减小可能引起上部结构变形和开裂的不均匀沉降。优化的好处可以转化为经济和环境节约，因为需要更少的材料来达到所需的基础性能水平。还讨论了施工引起的变异性的优化效益的可靠性。
Pile groups are frequently designed with equal or similar pile lengths. However, the significant interaction effects among equal-length piles imply that this may not be the optimized configuration. This paper presents the optimization analyses of piled rafts and freestanding pile groups, where pile lengths are varied across the group to optimize the overall foundation performance. The results of the analyses are applicable in cases where the piles derive a majority of the capacity from the frictional resistance. It is demonstrated that, with the same amount of total pile material, an optimized pile length configuration can both increase the overall stiffness of the foundation and reduce the differential settlements that may cause distortion and cracking of the superstructure. The benefits of the optimization can be translated to economic and environmental savings as less material is required to attain the required level of foundation performances. The reliability of the optimization benefits in relation to construction-induced variability is also discussed.