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沿海地区深基坑设计施工都十分重视其抗浮问题,在深基坑开挖前掌握抗拔桩对于基坑隆起和围护结构变形及受力规律十分重要,其研究成果对于节约工程成本和保证基坑施工安全具有重要的指导意义。以港珠澳大桥侧接线拱北海关隧道明挖段为依托,首先建立抗拔桩与土体的硬接触模型,并验证该模型对于抗拔桩模拟的合理性,采用极差分析法研究底板不同桩长和桩径加固对基坑围护结构稳定性的影响规律。分析结果表明,增大桩长可更有效地减小地表沉降,增大桩径可更好地控制连续墙的变形,增大桩长和桩径都可以很好地控制坑底隆起。
The design and construction of deep foundation pit in the coastal area attach great importance to its anti-floating problem. It is very important to grasp the anti-floating pile before deep foundation pit excavation for the deformation and force of foundation pit uplift and retaining structure. The research results are very important for saving engineering cost, To ensure the safety of foundation pit construction has an important guiding significance. Based on the Mingzhu section of Gongbei Customs Tunnel on the side connection of Hong Kong-Zhuhai-Macau Bridge, a hard-contact model was established between the pile and the soil, and the rationality of this model for the anti-pile simulation was verified. Influence of Pile Length and Pile Diameter Reinforcement on Stability of Foundation Pit Supporting Structure. The results show that increasing pile length can reduce surface subsidence more effectively. Increasing pile diameter can better control the deformation of continuous wall. Increasing pile length and pile diameter can all control well the uplift of pits.