绿塘整体浇筑堆石混凝土拱坝施工期温度仿真研究  

Temperature simulation on construction period of Lyutang integral casting arch dam of rock-filled concrete

作　　者：何涛洪 徐小蓉 雷峥琦 成克雄 曾旭 金峰[4] HE Taohong;XU Xiaorong;LEI Zhengqi;CHENG Kexiong;ZENG Xu;JIN Feng(Zunyi Survey and Design Institute of Water Conservancy and Hydropower Co.Ltd.,Zunyi563002,Guizhou,China;School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing102206,China;China Institute of Water Resources and Hydropower Research,Beijing100038,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing100084,China)

机构地区：[1]遵义市水利水电勘测设计研究院有限责任公司,贵州遵义563002 [2]华北电力大学水利与水电工程学院,北京102206 [3]中国水利水电科学研究院,北京100038 [4]清华大学水圈科学与水利工程全国重点实验室,北京100084

出　　处：《水利水电技术（中英文）》2024年第1期51-61,共11页Water Resources and Hydropower Engineering

基　　金：贵州省水利科技经费(KT201805);贵州省2021年科技支撑计划项目(黔科合[2021]一般359)。

摘　　要：【目的】绿塘大坝是一座不分横缝、整体浇筑的堆石混凝土拱坝,旨在解决坝体分缝过多而带来的施工干扰大、速度慢以及堆石率低等问题。为深入探究这种新拱坝型式的温度场分布特征与应力变化规律,得到堆石混凝土坝体不分缝或少分缝的理论依据,【方法】基于实测资料开展有限元温度仿真计算,考虑上游防渗层及预制混凝土块模板、混凝土水化反应及弹性模量增长、徐变等,采用结构多场仿真与非线性分析软件SAPTIS模拟整体浇筑拱坝的分层拱圈浇筑全过程,并分析坝体温度场与应力分布规律。【结果】结果显示:绿塘大坝施工期的混凝土水化温升较低,约3~10℃,部分高温月份浇筑的混凝土温升后能达到38.6℃;施工期拱向拉应力普遍小于0.8 MPa,仅上游自密实混凝土防渗层的局部应力达到1.5 MPa,预制混凝土块模板起到辅助吸热和力学约束作用;横缝对拱坝上游面的应力改善较为明显。【结论】结果表明,堆石混凝土拱坝采用不分横缝、全断面整体上升浇筑的型式是可行的,但建议上游防渗层设置短缝和高温季节采取合适的温控措施,该坝型对促进快速筑坝技术发展具有重要意义。[Objective]Lyutang dam is an integral casting rock-filled concrete(RFC)arch dam with no transverse joints,and it is developed aiming to solve the problems of much construction interference,slow construction speed and low rockfill rate caused by excessive joints.In order to explore the temperature field distribution characteristics and stress variation patterns of this new type arch dam,and obtain the theoretical basis for the non or few joints of the rockfill concrete dam body,[Methods]the finite element(FEM)simulation was performed based on measured temperature data,considering various factors such as the upstream anti-seepage layer,prefabricated concrete block templates,concrete hydration reactions,elastic modulus growth and creep.The software SAPTIS for the structural multiphysics simulation and nonlinear analysis was utilized to simulate the whole pouring process of layered arch rings,and analyze the temperature distribution and stress propagation for the integral casting arch dam.[Results]The results show that the hydration temperature rise of RFC concrete during the construction period of Lyutang dam is relatively low,about 3~10℃.For some hot months,the concrete temperature after rising can reach up to 38.6℃.The arch tensile stress of Lyutang dam during construction is generally less than 0.8 MPa,but only the local stress of the upstream im-pervious layer with self-compacting concrete reaches 1.5 MPa.The prefabricated concrete templates play a role in auxiliary heat absorption and mechanical constraint.The transverse joints can greatly improve the upstream stress of an arch dam.[Conclusion]The results demonstrate that it is feasible to adopt the dam type of integral casting RFC with no transverse joints,which is poured by the whole rising of full section,but it is suggested to set up short joints in the upstream impervious layer and take appropriate temperature control measures in hot seasons.This dam type is of great significance to promote the development of rapid dam construction technology.

关 键 词：堆石混凝土拱坝 整体浇筑 温度仿真 横缝 变形 

分 类 号：TV49[水利工程—水工结构工程] TV532