特高拱坝陡坡廊道混凝土施工期温控措施优化  

Optimization of Temperature Control Measures During the Concrete Construction Period of the Steep Slope Gallery of the Ultra-high Arch Dam

作　　者：汪娟 王振红[1] WANG Juan;WANG Zhenhong(China Institute of Water Resources and Hydropower Research,Beijing China,100038)

机构地区：[1]中国水利水电科学研究院,北京100038

出　　处：《水利与建筑工程学报》2025年第1期200-206,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研发计划项目(2021YFC3090102,2021YFC3090104);国家自然科学基金(52192672)。

摘　　要：特高拱坝混凝土温控防裂措施直接影响工程施工质量和结构安全,为防止特高拱坝施工期出现温度裂缝,以白鹤滩特高拱坝陡坡廊道坝段为例,采用三维有限元法,进行封拱温度、廊道遮闭等措施下混凝土温度场和温度应力分析,对比施工期温控措施优化效果。结果表明:特高拱坝陡坡非廊道约束区混凝土最高温度、最大拉应力和最小抗裂安全系数均满足温控防裂要求,主要开裂风险出现在廊道顶拱和底板局部区域;通过降低最高温度、提高封拱温度并提前做好廊道遮闭等措施,廊道混凝土最大拉应力降低为1.54 MPa~2.18 MPa,最大降低幅度达到57.4%,优化温控措施防裂效果明显。研究结果可为工程施工期温控方案提供参考。The temperature control and crack prevention measures for concrete in ultra-high arch dams directly affect the construction quality and structural safety of the project.In order to prevent temperature cracks during the construction period of ultra-high arch dams,this work took the steep slope gallery section of the Baihetan Extra High Arch Dam as an example,and adopted the three-dimensional finite element method to analyze the concrete temperature field and temperature stress under measures such as arch sealing temperature and gallery closure.The optimization effect of temperature control measures during the construction period is compared.The results show that the maximum temperature,maximum tensile stress,and minimum crack resistance safety factor of the concrete in the non-corridor constrained zone of the steep slope of the ultra-high arch dam all meet the requirements of temperature control and crack prevention,and the main cracking risk occurs in the local areas of the top arch and bottom plate of the corridor;By reducing the maximum temperature,increasing the arch sealing temperature,and taking measures such as covering the gallery in advance,the maximum tensile stress of the gallery concrete was reduced to 1.54 MPa~2.18 MPa,with a maximum reduction of 57.4%.The optimized temperature control measures have a significant crack prevention effect.The research results can provide reference for temperature control scheme during the construction period of engineering projects.

关 键 词：拱坝 廊道混凝土 施工期 温度应力 温控措施 

分 类 号：TU43[建筑科学—岩土工程]