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| 陆上风机实心圆盘基础温控防裂措施分析 |
| Analysis of Temperature Control and Crack Prevention Measures for Solid Disc Foundations of Wind Turbines |
| 投稿时间：2025-06-11 修订日期：2025-07-11 |
| DOI： |
| 中文关键词: 大体积混凝土 风机基础 温度应力 温控防裂 仿真计算 |
| 英文关键词: mass concrete wind turbine foundation temperature stress temperature control and crack prevention simulation calculation |
| 基金项目:国家自然科学基金 |
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| 摘要点击次数: 135 |
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| 中文摘要: |
| 针对高寒地区锡林郭勒盟陆上风电工程风机基础冬季施工的混凝土温度应力与裂缝控制问题,基于有限元软件ANSYS对实心圆盘风机基础进行温度场和应力场仿真分析,系统考察了降低绝热温升、掺入MgO膨胀剂和表面保温三种温控措施及其组合对基础内部、斜面和顶面等关键部位温度应力分布的影响规律。研究结果表明,仅降低绝热温升能够显著降低风机基础混凝土内部应力水平,但难以将基础表面拉应力完全控制在混凝土抗裂能力范围内；MgO膨胀剂能有效补偿内部收缩应力,但会增大表面拉应力；表面保温措施能有效降低早期外表面拉应力和后期内部拉应力,但保温层过厚或保温时间过短可能导致拆除时产生冷击现象。基于仿真结果,提出了降低绝热温升与永久性埋置保温层的组合方案,该方案可显著改善基础整体应力分布,有效控制温度裂缝的产生。 |
| 英文摘要: |
| This study addresses the challenges of concrete thermal stress and crack control in winter construction of wind turbine foundations for onshore wind power projects in the cold region of Xilingol League. Using ANSYS finite element software, simulation analyses of temperature and stress fields in solid disk foundations were conducted, systematically investigating the effects of three temperature control measures - reducing adiabatic temperature rise, incorporating MgO expansive agent, and surface insulation - as well as their combinations on thermal stress distribution in key areas including the interior, inclined surfaces, and top surfaces. The research demonstrates that while reducing adiabatic temperature rise alone can significantly decrease internal stress levels in foundation concrete, it cannot fully control surface tensile stresses within the concrete"s crack resistance capacity. MgO expansive agent effectively compensates for internal shrinkage stress but increases surface tensile stress. Surface insulation effectively reduces early-stage external surface tensile stress and late-stage internal tensile stress, though excessively thick insulation or insufficient insulation duration may lead to thermal shock during removal. Based on simulation results, we propose a combined approach of reducing adiabatic temperature rise with permanent embedded insulation, which significantly improves overall stress distribution and effectively controls thermal cracking. |
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