| 灌注桩动力特性试验与数值模拟研究 |
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| 引用本文： | 丁扬,熊晔,陈孜孜,吴晓寒,王小波.灌注桩动力特性试验与数值模拟研究[J].岩土力学,2022,43(Z2):640-646. |
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| 作者姓名： | 丁扬 熊晔 陈孜孜 吴晓寒 王小波 |
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| 作者单位： | 1. 军事科学院国防工程研究院，湖北 武汉 430010；2. 中航勘察设计研究院有限公司，北京 100098 |
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| 摘 要： | 结合某风洞建设项目现场桩基动力特性试验，采用三维有限差分模拟软件FLAC3D建立双桩模型基础进行计算机仿真，分析结果与试验数据吻合良好，验证了基于桩?土?结构共同作用开展数值模拟求解设备荷载作用下桩基础动力响应方法的合理性。进一步建立灌注桩后注浆模型，探讨采取不同桩侧阻力和桩端阻力增强系数对桩基动力特性的影响。结果表明：灌注桩后注浆对竖向振动的共振频率没有影响，对水平回转振动的共振频率、最大振幅、地基抗剪刚度系数和地基水平转向第1振型阻尼比的影响均很小；灌注桩后注浆能起到提高桩基抗压刚度、减少桩基最大振幅的效果，但相对于未注浆其效果有限。
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| 关 键 词： | 灌注桩后注浆 动力特性试验 共同作用 数值模拟 |
| 收稿时间： | 2021-12-29 |
| 修稿时间： | 2022-03-08 |
Field test and numerical simulation for dynamic characteristics of
cast-in-place pile |
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| DING Yang,XIONG Ye,CHEN Zi-zi,WU Xiao-han,WANG Xiao-bo.Field test and numerical simulation for dynamic characteristics of
cast-in-place pile[J].Rock and Soil Mechanics,2022,43(Z2):640-646. |
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| Authors: | DING Yang XIONG Ye CHEN Zi-zi WU Xiao-han WANG Xiao-bo |
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| Institution: | 1. Research Institute for National Defense Engineering of Academy of Military Sciences, Wuhan, Hubei 430010, China;
2. Institute of Geotechnical Engineering Company Limited, Aviation Industry Corporation of China, Beijing 100098, China |
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| Abstract: | Combined with the dynamic testing of pile foundation in a wind tunnel construction project, three-dimensional finite difference simulation software FLAC3D is used to simulate the double-pile model foundation. The numerical results are in good agreement with the experimental data, which verifies the rationality of numerical method based on the pile-soil-structure interaction to solve the dynamic response of the pile foundation under the equipment load. The post-grouting model of cast-in-place pile is further established to explore the influence of different lateral resistance and tip resistance enhancement coefficients on the dynamic characteristics of the pile foundation. The results show that the post-grouting of cast-in-place pile has no influence on the resonance frequency of the vertical vibration. The post-grouting of cast-in-place pile has slight influence on the resonance frequency of the horizontal rotary vibration, the maximum amplitude, the shear stiffness coefficient of the foundation, and the first mode damping ratio of the horizontal turning of the foundation. The post-grouting of cast-in-place pile can improve the compressive stiffness and reduce the maximum amplitude of the pile foundation, but its effect is limited compared with the non-grouting pile. |
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| Keywords: | post-grouting pile dynamic characteristics test interaction numerical simulation |
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