| 引用本文: | 周小文,李俊庆,周密,肖自卫.带桩靴的管桩钢模贯入挤土效应[J].哈尔滨工业大学学报,2022,54(2):135.DOI:10.11918/202008101 |
| ZHOU Xiaowen,LI Junqing,ZHOU Mi,XIAO Ziwei.Soil squeezing effect of installation of pipe pile casing[J].Journal of Harbin Institute of Technology,2022,54(2):135.DOI:10.11918/202008101 |
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| 带桩靴的管桩钢模贯入挤土效应 |
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周小文1,2,李俊庆1,2,周密1,2,肖自卫3
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(1.亚热带建筑科学国家重点实验室(华南理工大学),广州 510640;2.华南岩土研究中心(华南理工大学), 广州 510640;3.中铁南方投资有限公司,广东 深圳 518000)
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| 摘要: |
| 针对管桩钢模在贯入过程中出现的挤土效应迫使桩周土体发生变形,对施工产生不利影响的问题,基于RITSS大变形有限元方法建立管桩桩模贯入软土地基的数值模型,将仿真结果与现场实测数据作对比,验证有限元模型的准确性。随后开展参数分析,研究沉桩过程中管桩桩端的几何形状、土体强度因素对于桩周土体流动特性的影响。结果表明,以相对贯入深度Lp/R=8为分界点,管桩在贯入过程中分为浅层贯入模式和深层贯入模式两种。在不同的贯入区域中,土体的流动特性有较大差异。桩周土的水平位移以及隆起量与管桩桩靴角度有较大关系。根据数值仿真研究,针对实际工程中最常使用的桩靴（β=60°,wp=0.01 m）的桩模贯入结果,提出用于预测桩周土水平位移以及隆起量的拟合公式,与现场实测结果对比后证明该公式能够有效预测桩周土体的变形。研究结果为现浇混凝土管桩的设计和施工提供了理论指导。 |
| 关键词: 管桩 挤土效应 大变形有限元分析 水平位移 土体隆起 |
| DOI：10.11918/202008101 |
| 分类号:TU47 |
| 文献标识码:A |
| 基金项目:广东省基础与应用基础研究基金(2021A1515010828);国家自然科学基金(42176224);广东省现代土木工程技术重点实验室资助项目(2021B1212040003) |
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| Soil squeezing effect of installation of pipe pile casing |
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ZHOU Xiaowen1,2,LI Junqing1,2,ZHOU Mi1,2,XIAO Ziwei3
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(1.State Key Laboratory of Subtropical Building Science (South China University of Technology), Guangzhou 510640, China; 2.South China Institute of Geotechnical Engineering(South China University of Technology), Guangzhou 510640, China; 3.China Railway Southern Investment Group Co., Ltd., Shenzhen 518000, Guangdong, China)
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| Abstract: |
| During the casing penetration process, soil squeezing effect has a negative effect on the quality of the construction, which forces the soil around the pile to deform. Based on the large deformation finite element (LDFE) analyses using remeshing and interpolation technique with small strain (RITSS), a numerical model of pipe pile penetrating in soft clay was established, and numerical results were compared with field test data to verify the accuracy of the model. Then, a parametric study was carried out to examine the influences of pipe tip geometries and soil strength on the characteristics of soil movement induced by casing penetration. Results show that by taking the penetration depth of Lp/R=8 as the critical point, it could be divided into shallow penetration mode and deep penetration mode during the process of pile casing penetration. The soil flow mechanism was different in different penetration areas. The horizontal displacement of the soil and the soil heave outside the pile were closely related to the angle of the spudcan. According to the numerical simulation results, based on the casing penetration results of the commonly used spudcan (β=60°, wp=0.01 m) in practice, formulas for predicting horizontal displacement and soil heave were proposed. Compared with field test data, the proposed formulas could effectively predict the soil deformation around the pile. The research findings provide a theoretical guidance for the design and construction of cast-in-situ concrete piles (PCCs). |
| Key words: pipe pile soil squeezing effect large deformation finite element analysis horizontal displacement soil heave |
