摘要
高地温隧道在修建过程中,局部空间内围岩温度场随施工时间的延长而发生变化,调热圈的时空演化规律是掌握围岩向风流的散热、洞内风流热参数预测计算的基础。文章以某高原高地温隧道工程为背景,推导出不考虑产生的内热源时的高地温施工期隧道多孔介质传热控制方程;建立有限元模型获得孔隙率、围岩导热系数、围岩初始温度、风流温度对洞周围岩调热圈温度场的影响规律;之后进行多元线性回归分析,获得各因素敏感性,得到各因素的影响程度排序。研究结果表明:调热圈半径随着围岩导热系数、围岩初始温度的增加而增大,随着孔隙率、风流温度的增加而减小;影响高地温施工期隧道调热圈半径的因素按影响程度从高到低依次是导热系数、孔隙率、围岩初始温度、风流温度。
During the construction of high ground temperature tunnel,the temperature field of surrounding rock in local space changes with the extension of construction time.The temporal and spatial evolution law of heat transfer circle is the basis for mastering the heat dissipation of surrounding rock to wind flow and the prediction and calculation of thermal parameters of wind flow in tunnel.In this paper,the heat transfer control equation of tunnel porous media during high ground temperature construction period without considering the internal heat source is derived based on the engineering background of a high ground temperature tunnel project.The finite element model is established to obtain the influence of porosity,thermal conductivity of surrounding rock,initial temperature of surrounding rock and airflow temperature on the temperature field of rock heat transfer ring around the hole.After that,multiple linear regression analysis was carried out to obtain the sensitivity of each factor,and the order of influence degree of each factor was obtained.The results show that the radius of the heating ring increases with the increase of the thermal conductivity of the surrounding rock and the initial temperature of the surrounding rock,and decreases with the increase of the porosity and the air flow temperature.According to the influence degree from high to low,the factors affecting the radius of the tunnel heating ring during the construction period of high ground temperature are thermal conductivity,porosity,initial temperature of surrounding rock and airflow temperature.
作者
王帅帅
牛亚鹏
远洋
邓忠涌
周佳媚
徐勇
WANG Shuaishuai;NUI Yapeng;YUAN Yang;DENG Zhongyong;ZHOU Jiamei;XU Yong(CCCC Second Highway Engineering CO.,Ltd.,Xi′an 710065;Research and Development Center on Construction Technology of Long Bridge&Tunnel in Mountain Area,CCCC,Xi′an 710199;Southwest Jiaotong University,Key Laboratory of Traffic Tunnel Engineering,Ministry of Education,Chengdu 610031)
出处
《现代隧道技术》
北大核心
2025年第S1期61-69,共9页
Modern Tunnelling Technology
关键词
铁路隧道
高地温
地下水
通风
多孔介质
调热圈
影响因素
Railway tunnel
High ground temperature
Groundwater
Ventilation
Porous medium
Heat regulation ring
Influencing factors
