摘要
【目的】为了了解灌注桩桩底位移在不同土体中受超灌量影响的情况,采用数值模拟方法对其进行研究。【方法】选择有限元软件分析灌注桩在不同土体中和不同超灌量下,桩底竖向位移和桩侧土体侧向位移的变化规律。【结果】对于桩长20 m的灌注桩,超灌量在3 m以内时,对桩体竖向位移的影响不大,尚处于允许的误差范围内;在弹性模量小的土体中,桩底会发生更大的竖向位移,在弹性模量大的土体中则相反;桩底土体的竖向位移更多地集中在靠近桩体的部分,尤其是接近桩底的部分;土体的水平位移更多地集中在桩底两侧的扇形范围内。【结论】对模拟结果的分析表明实际工程中超灌量对工程质量的影响较小,本研究成果对类似灌注桩工程有借鉴意义。
[Objective] In order to learn about the influence of overfilling amount on the pile bottom displacement of the cast-in-place pile under different soil conditions, we adopted the numerical simulation method to research it. [Method] The change laws of the vertical displacement of pile bottom and the lateral displacement of the soil at pile side were analyzed with the finite element software under different soil conditions and different overfilling amounts. [Result] For the cast-in-place pile with a pile length of 20 m and the overfilling amount less than 3 m, it has little effect on the vertical displacement of pile, which is still within the allowable range;in the soil with small elastic modulus, the pile bottom tends to have greater vertical displacement;in contrast, in the soil with large elastic modulus, the opposite is true;the vertical displacement of the soil at the pile bottom is more concentrated in the part close to the pile, especially the part close to the pile bottom;the horizontal displacement of soil is more concentrated in the fan-shaped range on both sides of the pile bottom. [Conclusion] Through the analysis of the simulation results, it is shown that the overfilling amount exerts a quite small influence on the project quality in the actual project, and the research results can provide reference for similar cast-in-place pile projects.
作者
夏建中
刘天豪
XIA Jianzhong;LIU Tianhao(School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China)
出处
《浙江科技学院学报》
CAS
2023年第1期55-61,共7页
Journal of Zhejiang University of Science and Technology
基金
浙江科技学院校企合作项目(2020KJ414)。
关键词
有限元
灌注桩
桩底位移
土体位移
finite element
cast-in-place pile
pile bottom displacement
soil displacement
