三河口大坝施工期浇筑层温控措施优化分析  

Optimization analysis of temperature control measures for pouring layer during the construction period of Sanhekou Dam

作　　者：王佐荣 李晓峰 岳立宇 WANG Zuorong;LI Xiaofeng;YUE Liyu(Hanjing-to-Weihe River Valley Water Diversion Project Construction Co.,Ltd.,Shanxi Province,Xi’an 710024,China)

机构地区：[1]陕西省引汉济渭工程建设有限公司,陕西西安710024

出　　处：《水利建设与管理》2022年第12期68-75,共8页Water Conservancy Construction and Management

基　　金：陕西省水利科技计划项目:引汉济渭工程三河口碾压混凝土拱坝施工过程可视化仿真与优化研究(2016slkj-5)。

摘　　要：在大体积混凝土施工过程中,温度裂缝一直是施工中面临的难题,因此,浇筑层温控措施是施工期坝体碾压混凝土温度和应力变化过程的关键影响因素。本文基于ANSYS三维有限元方法,针对三河口碾压混凝土拱坝剖面和不同季节、不同浇筑层下的温控过程开展仿真模拟。研究结果表明:秋冬季浇筑碾压混凝土,随着浇筑厚度的逐步增加,碾压混凝土最高温度与最大应力值也依次增加;夏季浇筑碾压混凝土,随着浇筑厚度的增加,碾压混凝土最高温度与最大应力值也依次增加,安全系数依次递减,且与秋冬季浇筑碾压混凝土有明显差异;无论夏季还是秋冬季,1.5m层厚度与3.0m层厚度最大温度和最大应力值差异均较大,3.0m层厚度与4.5m层厚度最大温度差异均较小,在0.5℃范围内,最大应力值差异值也在0.5MPa范围内。In the process of mass concrete construction,temperature cracks have always been a difficult problem in the construction. Therefore,the temperature control measure of pouring layer is the key factor in the temperature and stress change process of RCC during the construction period. Based on the ANSYS three-dimensional finite element method,the temperature control process of the RCC arch dam profile in Sanhekou under different seasons and different pouring layers is simulated. The results show that in autumn and winter,the maximum temperature and maximum stress of RCC increase with the gradual increase of pouring thickness. In summer,the maximum temperature and maximum stress of RCC also increase with the gradual increase of pouring thickness,which is obviously different from that in autumn and winter. No matter in summer or autumn and winter,the difference of maximum temperature and maximum stress between 1. 5m layer thickness and 3. 0m layer thickness is large,and the difference of maximum temperature between 3. 0m layer thickness and4. 5m layer thickness is small. Within the range of 0. 5℃,the difference of maximum stress value is also within the range of 0. 5MPa.

关 键 词：仿真分析 温度应力 温控优化 仓面 三河口大坝 

分 类 号：TV642.2[水利工程—水利水电工程]