特高低热混凝土拱坝后期温度回升成因分析及预测研究

Analysis and prediction research on the causes of temperature rise in the later stage of ultra-high and low heat concrete arch dams

摘要

温度回升现象在特高拱坝中普遍存在，为更透彻地了解温度回升的原因及过程，以某特高拱坝为例，对温度监测资料进行分析，通过仿真计算和回归分析相结合的方法，构建该拱坝后期温升的计算模型，以此对拱坝封拱后温度回升问题进行深入研究。研究表明：(1)拱坝封拱后温度回升受外界温度内传和坝体混凝土水化热两个因素共同影响，但外界温度内传速度较慢，对坝体内部温度回升影响较小，且坝体实测最高温度高于稳定温度，因此，坝体封拱后温度回升的主要原因是混凝土水化发热；(2)某特高拱坝回升至最高温度需要3~6年，达到稳定温度需要20年左右；(3)水化热主要影响封拱后前期坝体内部的温升，对坝体最终稳定温度场没有影响。

Abstract

The phenomenon of temperature rise is common in ultra-high arch dams. In order to gain a deeper understanding of the causes and processes of temperature rise, this article takes a certain ultra-high arch dam as an example to analyze temperature monitoring data. Through a combination of simulation calculation and regression analysis, a calculation model for the later temperature rise of the arch dam is constructed to conduct in-depth research on the problem of temperature rise after the arch dam is sealed. Results has shown that:(1) The temperature rise after arch dam sealing is influenced by two factors: the internal transmission of external temperature and the hydration heat of concrete in the dam body. However, the speed of internal transmission of external temperature is slow, and the impact on the temperature rise inside the dam body is relatively small. Moreover, the measured maximum temperature of the dam body is higher than the stable temperature. Therefore, the main reason for the temperature rise after arch dam sealing is the hydration heat generated by concrete;(2) It takes 3~6 years for a certain ultra-high arch dam to reach its maximum temperature, and about 20 years to reach a stable temperature;(3) The hydration heat mainly affects the temperature rise inside the dam body in the early stage after arch sealing, and has no effect on the final stable temperature field of the dam body.

关键词

低热混凝土 / 特高拱坝 / 温度回升 / 仿真分析 / 绝热温升

Key words

low-heat concrete / ultra-high arch dam / temperature rise / simulation analysis / adiabatic temperature rise

Author summay

白治朋(1992—), 男, 高级工程师, 硕士, 主要从事水库大坝防洪安全研究。E-mail: [e-mail]

基金资助

三峡金沙江云川水电开发有限公司禄劝乌东德电厂项目(Z522302031)