长江科学院院报 ›› 2023, Vol. 40 ›› Issue (10): 153-159.DOI: 10.11988/ckyyb.20220583

• 水工结构与材料 • 上一篇    下一篇

高寒地区拱坝运行期保温板脱落位移和应力场分析

马基栋1, 武志刚1, 费新峰1, 吕维娟1, 李高超2   

  1. 1.国家电投集团青海黄河电力技术有限责任公司,西宁 810016;
    2.西安理工大学 水利水电学院,西安 710048
  • 收稿日期:2022-05-27 修回日期:2022-10-15 出版日期:2023-10-01 发布日期:2023-10-13
  • 通讯作者: 武志刚(1971-),男,甘肃天水人,正高级工程师,硕士,主要从事大坝安全监测工作。E-mail: xilixiaoliu@163.com
  • 作者简介:马基栋(1988-),男,甘肃靖远人,工程师,硕士,主要从事大坝安全监测工作。E-mail: xilijdy@163.com
  • 基金资助:
    国家自然科学基金项目(51809212)

Detachment Displacement and Stress Field of Thermal Insulation Board during Operation of Arch Dam in High and Cold Area

MA Ji-dong1, WU Zhi-gang1, FEI Xin-feng1, LÜ Wei-juan1, LI Gao-chao2   

  1. 1. State Power Investment Corporation Qinghai Yellow River Electric Power Technology Co., Ltd., Xining 810016, China;
    2. School of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China
  • Received:2022-05-27 Revised:2022-10-15 Online:2023-10-01 Published:2023-10-13

摘要: 在我国西北高寒地区,混凝土坝常利用表面保温板以避免温度应力导致坝体裂缝的产生,而保温板脱落、缺失等问题不利于结构运行安全。以某高寒拱坝为例,结合热-结构耦合数值模拟方法及位移监测资料的统计模型,分析了保温板脱落对混凝土的影响。数值模拟结果表明:保温板脱落区域的混凝土较未脱落时的温度影响主要位于混凝土表面,其最大温差在9 ℃左右,相应特征点位移差最大为2 mm;而脱落区域混凝土表面最大主拉应力达0.841 MPa。由坝体位移统计模型进一步分析可知,对保温板脱落前后时段测点的位移变化幅值之差最大为6 mm,与数值模拟结果的规律相一致。研究成果可为高寒地区混凝土拱坝保温板问题的研究提供有效参考。

关键词: 拱坝, 表面保温板, 温度位移, 温度应力, 仿真模拟, 安全监测, 高寒地区

Abstract: Surface thermal insulation boards are commonly employed in concrete dam projects in the alpine region of northwest China to prevent thermal stress-induced cracks in the dam structure. However, issues such as the detachment and loss of insulation boards can jeopardize the structural safety of dam during operations. In this study, an arch dam in the alpine region is used as a case study to analyze the impact of insulation board detachment on concrete. The analysis combines a thermal-structural coupling numerical simulation method with a statistical model based on displacement monitoring data. The numerical simulation results demonstrate that the temperature influence in the detachment area mainly occurs on the concrete surface. The maximum temperature difference is approximately 9 ℃, and the corresponding displacement difference of characteristic points reaches up to 2 mm. The maximum principal tensile stress on the concrete surface in the detachment area is 0.841 MPa. Moreover, the statistical model of dam body displacement confirms that the amplitude of displacement changes before and after detachment can reach 6 mm, aligning with the patterns observed in the numerical simulation results. The research findings provide valuable insights for investigating thermal insulation boards on concrete arch dams in alpine areas.

Key words: arch dam, thermal insulation board, thermal displacement, thermal stress, numerical simulation, safety monitoring, high and cold area

中图分类号: