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

MA Ji-dong; WU Zhi-gang; FEI Xin-feng; L&#xDC; Wei-juan; LI Gao-chao

doi:10.11988/ckyyb.20220583

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Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (10) : 153-159. DOI: 10.11988/ckyyb.20220583

Hydraulic Structure and Material

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

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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

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MA Ji-dong, WU Zhi-gang, FEI Xin-feng, LÜ Wei-juan, LI Gao-chao. Detachment Displacement and Stress Field of Thermal Insulation Board during Operation of Arch Dam in High and Cold Area[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(10): 153-159 https://doi.org/10.11988/ckyyb.20220583

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