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热-力耦合作用下能源群桩工作特性的数值模拟

董龙龙 梅国雄 吴文兵 王立兴 阮恒丰

董龙龙, 梅国雄, 吴文兵, 王立兴, 阮恒丰. 热-力耦合作用下能源群桩工作特性的数值模拟[J]. 地质科技通报, 2021, 40(6): 326-334. doi: 10.19509/j.cnki.dzkq.2021.0632
引用本文: 董龙龙, 梅国雄, 吴文兵, 王立兴, 阮恒丰. 热-力耦合作用下能源群桩工作特性的数值模拟[J]. 地质科技通报, 2021, 40(6): 326-334. doi: 10.19509/j.cnki.dzkq.2021.0632
Dong Longlong, Mei Guoxiong, Wu Wenbing, Wang Lixing, Ruan Hengfeng. Numerical simulation of working characteristics of energy pile group under thermo-mechanical coupling[J]. Bulletin of Geological Science and Technology, 2021, 40(6): 326-334. doi: 10.19509/j.cnki.dzkq.2021.0632
Citation: Dong Longlong, Mei Guoxiong, Wu Wenbing, Wang Lixing, Ruan Hengfeng. Numerical simulation of working characteristics of energy pile group under thermo-mechanical coupling[J]. Bulletin of Geological Science and Technology, 2021, 40(6): 326-334. doi: 10.19509/j.cnki.dzkq.2021.0632

热-力耦合作用下能源群桩工作特性的数值模拟

doi: 10.19509/j.cnki.dzkq.2021.0632
基金项目: 

国家自然科学基金项目 51678547

国家自然科学基金项目 51878634

浙江省自然科学基金杰出青年项目 LR21E080005

详细信息
    作者简介:

    董龙龙(1996-), 男, 现正攻读地质工程专业硕士学位, 主要从事桩基工程理论与技术方面的研究工作。E-mail: 2320265158@qq.com

    通讯作者:

    吴文兵(1988-), 男, 教授, 博士生导师, 主要从事桩基工程方面的研究与教学工作。E-mail: zjuwwb1126@163.com

  • 中图分类号: TU74

Numerical simulation of working characteristics of energy pile group under thermo-mechanical coupling

  • 摘要: 为研究能源群桩工作特性,基于Abaqus有限元模拟,将换热稳定阶段的平均温度赋予桩体进行稳态热-力耦合计算,提出了能源群桩承载特性的简化分析方法,并通过与现场数据的对比分析,验证了该研究方法的可行性。结合算例,进一步利用该方法对纯力学荷载和热-力耦合作用下的能源群桩的承载特性进行了分析。结果表明:①群桩基础中能源桩分散对称分布的不均匀沉降要明显小于集中分布,而且分布形式对桩基结构响应特征影响较大;②桩基等刚度下,增大桩径和减小桩间距,群桩倾斜控制效果较好。研究成果可以为能源群桩的工程应用提供一定的参考。

     

  • 图 1  A1桩身侧摩阻力分布曲线

    Figure 1.  Friction resistance distribution curves of energy pile A1

    图 2  A1桩身轴力分布曲线

    Figure 2.  Axial force distribution curves of energy pile A1

    图 3  群桩基础中各桩编号

    Figure 3.  Pile number in pile group foundation

    图 4  群桩基础不均匀沉降

    Figure 4.  Non-uniform settlement of pile group foundation

    图 5  基础底板不均匀沉降

    Figure 5.  Uneven settlement of foundation slab

    图 6  桩身轴力分布

    Figure 6.  Axial force distribution of pile

    图 7  桩身轴力分布

    Figure 7.  Axial force distribution of pile

    图 8  桩1加热侧摩阻力分布曲线

    Figure 8.  Friction resistance distribution curves of energy pile A1 at heating

    图 9  不同桩长下的基础倾斜

    Figure 9.  Foundation slope under different pile lengths

    图 10  不同桩径下的基础倾斜

    Figure 10.  Foundation tilt under different pile diameters

    表  1  桩-土力学及热物性参数

    Table  1.   Pile-soil mechanics and thermal property parameters

    桩身密度/
    (kg·m-3)
    桩体弹性模量/GPa 桩体泊松比 桩体热膨胀系数/
    (m· ℃-1)
    桩体导热系数/(W·
    m-1·℃-1)
    桩体比热容/
    (J·kg-1·
    -1)
    土体综合导热系数/(W·
    m-1·℃-1)
    土体综合比热容/(J·kg-1·
    -1)
    土体综合热膨胀系数/
    (m·℃-1)
    2 500 30 0.2 1.0×10-5 2.3 960 1.8 1 500 5.0×10-6
    下载: 导出CSV

    表  2  土层分布及物理力学参数

    Table  2.   Soil layer distribution and physical and mechanical parameters

    土层编号 土层 厚度/m 密度/(kg·m-3) 黏聚力/kPa 内摩擦角/(°) 泊松比 弹性模量 桩土摩擦系数
    ①-1 素填土 3.0 1 800 9 11.6 0.35 28 0.2
    表土 2.0 1 800 9 11.6 0.35 28 0.2
    粉质黏土 1.5 1 830 22 12.8 0.35 25 0.2
    淤泥质粉质黏土 2.0 1 830 13 10.0 0.40 15 0.2
    粉质黏土 5.0 1 940 42 15.0 0.35 80 0.2
    ⑤-1 粉土夹粉砂 6.0 1 840 8 25.1 0.30 100 0.3
    ⑤-2 粉砂夹粉土 6.0 1 860 6 27.1 0.30 140 0.3
    粉土 2.5 1 810 9 22.1 0.30 120 0.3
    粉土 12.0 1 840 8 25.2 0.30 200 0.3
    下载: 导出CSV

    表  3  不同能源桩布设形式的倾斜

    Table  3.   Tilt of different energy pile layout forms

    换热工况 单桩 临近双桩 对角双桩
    加热 倾斜/% 1.20 0.823 0.872
    降温 0.81 0.984 0.876
    下载: 导出CSV

    表  4  不同桩间距和承台厚度情况下的倾斜

    Table  4.   Tilting under different pile spacing and pile cap thickness

    编号 桩长/m 桩径/m 桩间距/m 承台厚度/m 倾斜/‰
    1 30 0.3 2.4 0.5 0.44
    2 30 0.3 3.0 0.5 0.93
    3 30 0.4 3.0 0.5 0.95
    4 30 0.4 3.0 0.6 0.67
    5 30 0.4 3.0 0.8 0.55
    6 30 0.4 3.0 1.0 0.53
    7 30 0.4 3.0 1.5 0.51
    下载: 导出CSV
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