大型深基坑开挖中拔桩基础的性能研究

Q3 Earth and Planetary Sciences
Jianjin Chen, Jian-Hua Wang, R. Liang, Wei-Wei Fan, Wei-dong Wang
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引用次数: 8

摘要

大型深基坑开挖引起的土体卸载和回弹会影响开挖区内既有桩的性能和完整性,特别是对于上拔桩。采用非线性有限元法对上海世博地下变电所工程深基坑中上拔桩的受力特性进行了研究。通过对上拔桩荷载试验的反分析,得到了桩底土参数。利用这些参数分析了深基坑上拔桩在正常工作荷载作用下的受力特性。结果表明:开挖引起的拉力对上拔桩的影响大于普通桩;因此,在进行桩身设计时应考虑这种预紧力。分析表明,扩底上拔桩在开挖过程中承受的预紧力比普通上拔桩大。桩在工作荷载作用下的预紧力可由开挖引起的张拉力和工作荷载引起的张拉力组合而成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Behavior of Uplift Pile Foundation during Large-Scale Deep Excavation
Soil unloading and rebound induced by large-scale deep excavation may affect the performance and integrity of existing piles inside the excavation zone,especially for up-lift piles.The non-linear finite element is employed to investigate the behavior of the up-lift piles in Shanghai Expo Underground Substation Project during deep excavation.Parameters of the subsoil are obtained by inverse analysis of the load tests on the up-lift piles.The behavior of the up-lift piles during deep excavation and under normal working load is analyzed by using the parameters.Results show that the tension force induced by excavation exerts a more negative influence on up-lift piles than normal piles.Therefore this pretension should be taken into consideration during pile design.Analysis shows the bottom-enlarged up-lift piles are subjected to a larger pretension force during excavation than ordinary up-lift piles.The pretension force of piles under working load can be deduced from the combination of the tension force induced by excavation and the tension force induced by working load.
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来源期刊
岩土工程学报
岩土工程学报 Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
2.50
自引率
0.00%
发文量
11264
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