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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年03期

页码:

129-137

栏目:

桥隧工程

出版日期:

2024-05-20

文章信息/Info

Title:

Research on mechanism of insulation effect and thickness influencing factors of tunnel anti-freezing insulation layer in cold regions

文章编号:

1673-2049(2024)03-0129-09

作者:

陈建勋^1,2,董体健¹,赵鹏宇^1,2,黄解放³,杨野东⁴

(1. 长安大学 公路学院,陕西 西安 710064; 2.长安大学 寒冷地区隧道气象与结构力学状态交通运输行业野外科学观测研究基地,陕西 西安 710064; 3. 中交一公局集团有限公司,北京 100024; 4. 中交第一公路勘察设计研究院有限公司,陕西 西安 710075)

Author(s):

CHEN Jianxun^1,2, DONG Tijian¹, ZHAO Pengyu^1,2, HUANG Jiefang³, YANG Yedong⁴

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Scientific Observation and Research Base of Transport Industry of Meterology and Structural Mechanical State of Tunnels in Cold Areas, Chang'an University, Xi'an 710064, Shaanxi, China; 3. China First Highway Engineering Co., Ltd., Beijing 100024, China; 4. CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China)

关键词:

隧道工程;  寒冷地区;  防冻保温层;  隔热机理作用;  影响因素

Keywords:

tunnel engineering;  cold region;  anti-freezing insulation layer;  mechanism of insulation effect;  influencing factor

分类号:

U452.2

DOI:

10.19815/j.jace.2022.05059

文献标志码:

A

摘要:

针对寒冷地区公路隧道防冻保温层表面铺设,共设置了21组计算工况,通过对年周期下隧道防冻保温层、衬砌结构和围岩沿径向温度场变化以及各工况所需的防冻保温层厚度进行数值模拟计算,研究隧道防冻保温层隔热作用机理及其所需厚度的影响因素。结果表明:防冻保温层隔热作用显著,主要体现在使隧道衬砌结构和围岩年温度振幅降低上,同时年平均温度也有一定升高; 随着防冻保温层铺设厚度增大,隧道衬砌结构和围岩年平均温度和年温度振幅分别呈指数函数升高和降低,相应的年最低温度也呈指数函数升高,防冻保温层厚度越大,隔热效果越好,但是隔热效率不断降低; 围岩导热系数越大,导温系数越小,防冻保温层隔热效果越显著; 防冻保温层所需厚度随围岩导热系数和围岩初始温度升高呈指数函数减小,随围岩导温系数升高呈对数函数增加,随年平均气温和年温度振幅升高分别呈线性减小和增加,防冻保温层厚度应综合考虑以上各因素进行计算确定。

Abstract:

21 calculation working conditions were set for the highway tunnel in cold regions with anti-freezing insulation layer laid at the lining surface. By conducting numerical simulation calculations on the radial temperature field of tunnel anti-freezing insulation layer, lining, and surrounding rock under annual cycle, as well as the required thickness of the anti-freezing insulation layer for each working condition, the mechanism of insulation effect of the tunnel anti-freezing insulation layer and influencing factors on the required thickness were studied. The results show that the insulation effect of the anti-freezing insulation layer is significant, which mainly reflects in reducing the annual temperature amplitude of the tunnel lining and surrounding rock, meanwhile the annual average temperature also increases to a certain extent. As the thickness of the anti-freezing insulation layer increases, the annual average temperature and temperature amplitude of the tunnel lining and surrounding rock increase and decrease exponentially, respectively, and the corresponding annual minimum temperature also increases exponentially. The thicker the anti-freezing insulation layer, the better the insulation effect, but the insulation efficiency continues to decrease. The larger the thermal conductivity coefficient, and the lower the thermal conductivity coefficient of the surrounding rock, the more significant the insulation effect of the anti-freezing insulation layer. The required thickness of the anti-freezing insulation layer decreases exponentially with the increase of the thermal conductivity coefficient and initial temperature of the surrounding rock, increases logarithmically with the increase of the thermal conductivity coefficient of the surrounding rock, and linearly decreases and increases with the increase of the annual average temperature and annual temperature amplitude, respectively. The thickness of the anti-freezing insulation layer should be calculated and determined by considering all the above factors comprehensively.

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备注/Memo

备注/Memo:

收稿日期:2023-05-11
基金项目:新疆维吾尔自治区重大科技专项项目(2018A03003-4); 西藏自治区科技计划项目(XZ201801-GB-07)
作者简介:陈建勋(1969-),男,工学博士,教授,博士生导师,E-mail:chenjx1969@chd.edu.cn。
通信作者:赵鹏宇(1989-),男,工学博士,副教授,E-mail:903716642@qq.com。

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更新日期/Last Update: 2024-05-20