Numerical simulation of working characteristics of energy pile group under thermo-mechanical coupling
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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。Abstract: In order to study the working characteristics of energy pile groups, based on the Abaqus finite element simulation, assigns the average temperature of the heat transfer stable stage to the pile body for steady-state thermo-mechanical coupling calculation, and proposes a simplified analysis method for the bearing characteristics of energy pile groups.The reliability of this research method is verified through the comparative analysis with field data.Combined with an example, this method is used to analyze the bearing characteristics of energy group piles under the action of pure mechanical load and thermal coupling.The results show that the non-uniform settlement of the distributed symmetrical arrangement of energy piles in the pile group foundation is significantly less than that of the centralized arrangement, and the layout has a great influence on the response characteristics of the pile foundation structure.Under the condition of equal stiffness of pile foundation, the control effect of pile group tilt is better by increasing pile diameter and decreasing pile spacing.The research results of this paper can provide some reference value for the engineering application of energy pile group.
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Key words:
- energy pile group /
- numerical simulation /
- thermo-mechanical coupling /
- differential settlement /
- Abaqus
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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
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 
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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 ① 表土 2.0 1 800 9 11.6 0.35 28 0.2 ② 粉质黏土 1.5 1 830 22 12.8 0.35 25 0.2 ③ 淤泥质粉质黏土 2.0 1 830 13 10.0 0.40 15 0.2 ④ 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 ⑥ 粉土 2.5 1 810 9 22.1 0.30 120 0.3 ⑦ 粉土 12.0 1 840 8 25.2 0.30 200 0.3
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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
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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
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