超大直径钢管桩免共振法施工对桩周土体变形的影响分析
黄耀东
Influence Analysis of Super-large Diameter Steel Pipe Pile Resonance-free Method Construction on Surrounding Soil Deformation
HUANG Yaodong
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作者信息:中铁二十四局集团上海铁建工程有限公司，200070，上海
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Affiliation:China Railway 24th Bureau Group Shanghai Railway Co., Ltd., 200070, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.019
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中图分类号/CLCN:U239.5；U215.7
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栏目/Col:研究报告
摘要:
［目的］高频免共振法以其高工效和低环境影响的特点而著称。为深入研究高频免共振法施工超大直径钢管桩时对周围土体变形及振动的影响，特在工程现场附近进行了非原位试桩试验。［方法］建立了详细的数值模型，用以计算并分析钢管桩施工对桩周土体的影响，并将计算结果与实测数据进行比对验证；同时，实测了沉桩过程中地面的竖向位移、土体水平位移及土体振动速度等关键参数。［结果及结论］试验结果显示：地面最大沉降值为2.5mm，靠近钢管桩的地面土体出现下沉现象，而在一定距离外则表现为隆起，特别是在距离钢管桩3倍直径以外的区域，地面竖向位移非常小；土体水平位移总体较小，最大位移为-1.58mm，表明土体水平变形包含挤压与收缩两种形态，且下节桩施工引起的土体变形显著大于上节桩。数值模拟与实测数据的对比表明，两者在变形规律上基本吻合。
Abstracts:
［Objective］ The high-frequency resonance-free method is renowned for its high efficiency and low environmental impact. To further investigate the influence of constructing super-large diameter steel pipe pile with this method on the deformation and vibration of surrounding soil, a non-in-situ test pile experiment is conducted near the construction site. ［Method］ A detailed numerical model is established to calculate and analyze the effects of steel pipe pile construction on surrounding soil, with the calculated results validated against measured data. Key parameters such as vertical ground displacement, horizontal soil displacement, and soil vibration velocity are measured during the pile driving process. ［Result & Conclusion］ The experimental results indicate that the maximum land subsidence value is 2.5 mm. The ground soil near the steel pipe pile exhibits subsidence, while areas at a certain distance shows an upheaval, particularly in regions beyond three times the steel pipe pile diameter, where vertical ground displacement is minimal. Horizontal soil displacement is generally small, with a maximum displacement of -1.58 mm, indicating that the soil horizontal deformation includes both compression and contraction, with the soil deformation induced by the lower pile segment construction significantly greater than that by the upper segment construction. The comparison between numerical simulation and measured data shows a general consistency in deformation laws.
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