| 考虑沉桩效应的群桩非线性荷载-沉降解析 |
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| 引用本文： | 李林,李镜培,孙德安,龚卫兵.考虑沉桩效应的群桩非线性荷载-沉降解析[J].岩土力学,2019,40(2):668-677. |
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| 作者姓名： | 李林 李镜培 孙德安 龚卫兵 |
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| 作者单位： | 1. 同济大学 岩土及地下工程教育部重点实验室，上海 200092；2. 同济大学 地下建筑与工程系，上海 200092；
3. 上海大学 土木工程系，上海 200072 |
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| 基金项目： | 国家自然科学基金项目（No. 41272288） |
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| 摘 要： | 考虑沉桩效应对桩周土体力学特性的影响，采用指数函数型荷载传递曲线分别建立了静压桩的桩侧和桩端荷载传递模型。在此基础上，根据群桩加载过程中桩周土体的变形模式，基于荷载传递法描述桩-土界面的非线性行为，采用剪切位移法考虑群桩之间的相互作用，提出了考虑沉桩效应的群桩非线性荷载-沉降混合计算方法。通过开展离心模型试验对该计算方法解答进行了验证，研究了沉桩效应和桩-土界面非线性特征对群桩承载特性的影响。研究结果表明，沉桩效应对桩周土体起到挤密作用，使得桩周土体的强度和刚度增大，从而提高了群桩的承载特性。群桩加载过程中桩-土界面刚度随沉降变形而逐渐减小，使得群桩荷载-沉降曲线呈现出明显的非线性特征。
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| 关 键 词： | 沉桩效应 非线性 加筋效应 荷载传递 离心模型试验 |
| 收稿时间： | 2017-08-14 |
Nonlinear load-settlement analysis of pile groups considering pile installation effects |
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| LI Lin,LI Jing-pei,SUN De-an,GONG Wei-bing.Nonlinear load-settlement analysis of pile groups considering pile installation effects[J].Rock and Soil Mechanics,2019,40(2):668-677. |
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| Authors: | LI Lin LI Jing-pei SUN De-an GONG Wei-bing |
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| Institution: | 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
3. Department of Civil Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | Considering the effects of the pile installation on the properties of the soils surrounding the piles, the load transfer models for pile shaft and pile base are established using the exponential function type load transfer curve. Then, according to the deformation mode of the soil around the piles, the stress transfer method is adopted to model the nonlinear behaviour at the pile-soil interface and the shear displacement method is used to evaluate the pile-pile interaction effects. A hybrid calculation method is proposed for assessing the nonlinear load-settlement behaviour of pile groups. The proposed method is verified by the centrifuge model test. Investigations are conducted on the effects of pile installation and nonlinear behaviour on bearing performance of pile groups. The results show that, the strength and stiffness of the soil around the piles are significantly enhanced by the pile installation due to the squeeze effects, which greatly improves the bearing performance of the pile group. The stiffness of pile-soil interface decreases with the increase of the settlement, and hence the pile group exhibits apparent nonlinear behaviour during the loading process. |
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| Keywords: | pile installation effects nonlinearity reinforcement effect load transfer centrifugal model test |
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