摘要
冻结法施工中高性能混凝土浇筑初期温度场分析对衬砌结构防裂、防冻,提高衬砌质量有重要作用。通过绝热温升试验获得CF80水化生热模型,采用积分变换、分离变量和杜哈美尔定理推导具有不同边界条件下衬砌浇筑初期温度场解析解,以山东万福通风竖井冻结施工为例,建立传热模型计算出数值解,并与解析解及现场实测结果进行对比,结果表明:数值解与解析解的绝热点位置误差为9.84%,峰值温度误差为1.57%,且与实测结果(29h左右达到峰值温度73.8℃)一致,验证了理论模型的可靠性。衬砌达到峰值温度时刻的径向温度场呈二次函数分布,从绝热点位置两侧-0.1~0.2m范围内解析解、数值解和实测值一致性较高;温度场随时间变化可分诱导期、快速升温期、快速降温期和平稳降温期的四阶段变化规律。
The analysis of temperature field during the early concrete pouring stage in freezing method construction is critical for preventing cracks and frost damage in lining structures while improving construction quality.This study established a hydration heat generation model for CF80 concrete through adiabatic temperature rise tests.By applying integral transform,separation of variables,and Duhamel′s theorem,analytical solutions for temperature fields under different boundary conditions during lining pouring were derived.Using the Wanfu ventilation shaft freezing project in Shandong province as a case study,a numerical heat transfer model was developed.Comparative analysis among numerical solutions,analytical solutions,and field measurements indicated a positional error of 9.84%in adiabatic points and a peak temperature error of 1.57%between numerical and analytical solutions.Both solutions were consistent with field measurements,reaching a peak temperature of 73.8℃approximately 29 hours after pouring,thereby validating the reliability of the theoretical model.The radial temperature field at peak temperature exhibited quadratic function distribution,showing high consistency among analytical solutions,numerical solutions,and measured values within-0.1~0.2 m range from adiabatic points.Temporal temperature evolution demonstrated four distinct phases:induction period,rapid heating phase,rapid cooling phase,and steady cooling phase.
作者
袁月
邹久群
庞建勇
郝泽睿
严朝江
YUAN Yue;ZOU Jiuqun;PANG Jianyong;HAO Zerui;YAN Chaojiang(Engineering Research Center of Underground Mine Construction,Ministry of Education(Anhui University of Science and Technology),Huainan 232001;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001)
出处
《现代隧道技术》
北大核心
2025年第S1期187-197,共11页
Modern Tunnelling Technology
基金
安徽理工大学矿山地下工程教育部工程研究中心开放基金(JYBGCZX2022102)
关键词
衬砌温度场
冻结法施工
高性能混凝土
杜哈美尔定理
积分变换
Lining temperature field
Freezing method
High performance concrete
Duhamel′s theorem
Integral transform method
