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合理选择保温板拆除时机可有效减少混凝土产生裂缝的可能，为明确特高拱坝保温板的最优拆除时机，以某特高拱坝为例，基于实测温度数据，采用有限单元法模拟分析保温板拆除前后坝体温度场与湿度场的变化规律，对比分析了2027年与2030年冬、夏季拆除保温板后坝体表面应力及湿度场响应特征。结果表明，冬季拆除保温板会因温差增大导致坝体表面以拉应力为主，最大拉应力约0.9 MPa;而夏季拆除则因温差较小，坝体表面以压应力为主，最大压应力约0.6 MPa。此外，保温板拆除后混凝土湿度场显著下降，表面湿度扩散加快，说明保温板能有效降低内外温差，减缓水分蒸发。研究结果为特高拱坝施工中保温拆除时机的合理选择提供了一定参考。
Abstract：Removing insulation boards at an appropriate time can effectively reduce the risk of concrete cracking. To identify the suitable timing for insulation removal, based on measured temperature data from a specific ultra-high arch dam, the finite element method is employed to simulate and analyze the variations in dam temperature and humidity before and after insulation board removal. The dam surface stress and humidity fields after insulation board removal in the winter and summer of the years 2027 and 2030 are compared and analyzed. The results show that the removal of the insulation board in winter results in predominantly tensile stresses on the dam surface due to an increased temperature difference, with a maximum tensile stress of approximately 0.9 MPa; Whereas in summer, the smaller temperature difference leads to predominantly compressive stresses, with a maximum compressive stress of about 0.6 MPa. Furthermore, after the insulation board is removed, the humidity field of the concrete decreases significantly and the surface humidity diffusion accelerates, indicating that the insulation board can effectively reduce the internal-to-external temperature difference and slow down moisture evaporation. These findings provide a reference for the rational selection of the insulation removal timing during the construction of ultra-high arch dams.
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基本信息:
DOI：10.20040/j.cnki.1000-7709.2026.20251057
中图分类号:TV642.4;TV544
引用信息:
[1]白治朋,刘西军,文勇波,等.保温板拆除时机对特高拱坝温度与湿度的影响[J].水电能源科学,2026,44(07):56-61.DOI:10.20040/j.cnki.1000-7709.2026.20251057.
基金信息:
三峡金沙江云川水电开发有限公司禄劝乌东德电厂资助项目(Z522302031)
2026-01-19
2026-01-19
2026-01-19