Temperature monitoring and temperature control measures optimization of arch dam floor of flow channel during construction period

Purpose During the construction process, temperature cracks are easily generated at the dam orifice, which greatly threaten the stability of the dam structure. Therefore, to mitigate the adverse effects of a sudden temperature drop, it is crucial to implement temperature monitoring and develop specific temperature control measures. Design/methodology/approach In this paper, based on the monitoring data obtained from the concrete surface temperature monitoring test conducted on the floor of the flow channel of Baihetan Arch Dam, the temperature field and thermal stress of concrete at the floor of the flow channel are calculated. Subsequently, the stress field distribution is analyzed under the influence of a sudden temperature drop. Finally, corresponding temperature control measures are proposed for different temperature drop patterns, and the effectiveness of the corresponding temperature control effects is analyzed. Findings In total, during the temperature dropped by 8°C, 12°C and 16°C within 3 days, the use of polyethylene coil insulation material with a thickness of at least 2 cm, 3 cm and 4 cm can weaken the adverse effects of a sudden temperature drop on the floor of the flow channel structure. Practical implications This study provides some references and suggestions for the preparation of temperature control measures for the construction of the ledger wall of the flow channel structure at the construction site. Originality/value Compared with previous studies, this study uses numerical simulation methods to calculate the temperature field and analyze the stress field distribution under the influence of a sudden temperature drop. In addition, the temperature control effects of different insulation measures were compared and optimized for selection.