| 黏土地基中能量桩力学特性数值分析 |
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| 引用本文： | 费康,钱健,洪伟,刘汉龙.黏土地基中能量桩力学特性数值分析[J].岩土力学,2018,39(7):2651-2661. |
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| 作者姓名： | 费康 钱健 洪伟 刘汉龙 |
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| 作者单位： | 1. 扬州大学 岩土工程研究所，江苏 扬州 225127；2. 河海大学 岩土力学与堤坝工程教育部重点实验室，江苏 南京 210098 |
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| 基金项目： | 国家自然科学基金项目(No. 51778557，No. 51378178)；江苏省“青蓝工程”资助项目（苏教师[2016]15号）。 |
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| 摘 要： | 能量桩是将地源热泵系统中的换热管埋置在桩体内部，桩同时起到承载和换热的作用，是一种新型的基础型式。为了合理分析黏土地基中能量桩的力学特性，需要了解能量桩运行过程中桩和地基土的温度响应，并考虑温度变化对土体力学性能的影响。基于有限元软件ABAQUS建立了能量桩传热分析三维有限元模型，把能量桩的传热简化为换热管内液体与管壁之间的对流传热、桩体中的热传导和地基中的热传导，将计算结果与常规理论和实测数据进行了对比验证。对热力耦合边界面本构模型进行了二次开发，通过算例验证了模型对土体压缩和剪切性状温度效应的模拟能力。利用所提出的能量桩传热分析方法和热边界面模型，考虑不同的桩顶工作荷载水平，对正常固结黏土地基中能量桩单桩的长期性能进行了研究，分析了温度循环对桩顶沉降、桩侧摩阻力和桩身轴力的影响。结果表明，工作荷载越高，温度循环次数越多，桩顶累积沉降越大。
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| 关 键 词： | 能量桩 黏土 循环温度荷载 热塑性 力学特性 |
| 收稿时间： | 2016-10-10 |
Numerical analysis of mechanical behavior of energy piles in clay |
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| FEI Kang,QIAN Jian,HONG Wei,LIU Han-long.Numerical analysis of mechanical behavior of energy piles in clay[J].Rock and Soil Mechanics,2018,39(7):2651-2661. |
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| Authors: | FEI Kang QIAN Jian HONG Wei LIU Han-long |
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| Institution: | 1. Institute of Geotechnical Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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| Abstract: | Energy piles are piles equipped with heat exchange pipes through which a heat-carrying fluid circulates and exchanges heat with the ground. This technology couples the structural role of classical pile foundations with heat exchangers for energy supply. In order to analyze the bearing characteristics of energy piles in clay, it is necessary to determine the temperature response of the pile and the ground, so as to investigate the effects of temperature on mechanical behavior of the soil. With the use of the finite element software ABAQUS, a numerical approach has been developed to evaluate the thermal response. In this method, the heat transfer process is simplified as the thermal convection between the fluid and the pipe wall, the thermal conduction in the pile, and thermal conduction in the ground. Validation of the proposed method is carried out by comparing the computed results with the theoretical solutions and data from literature. A thermo-bounding surface model is implemented into ABAQUS. The ability of the model to describe the temperature effects on mechanical behavior of clays is verified by several examples. Based on the numerical heat transfer method and the implemented constitutive model, the long-term performance of a free-head energy pile in normally consolidated clay is analyzed. In the analysis, three different load levels are considered. The effects of the seasonally cyclic thermal loading on pile settlement, shaft friction, and axial force are studied in detail. |
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| Keywords: | energy pile clay cyclic thermal loading thermo-plasticity mechanical behavior |
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