摘要
为研究施工隧道内空气温度变化规律,基于热平衡方程建立稳定状态下隧道迎头区域内温度计算数学模型,利用数值模拟软件与温度计算模型结果进行对比并对模型进行修正.结果表明:空气温度计算值与模拟值最大相对误差为5.96%,修正后为1.73%,温度计算数学模型可以用于计算不同工况下迎头区域内空气平均温度;围岩温度、送风量会对隧道内温度产生影响,随着送风时间的增加,迎头区域内空气温度先增加然后达到稳定状态;围岩温度每上升5℃,空气平均温度上升1℃左右,不同围岩温度下空气温度变化速率基本一致;风量由20 m;/s增加至30 m;/s时,降温作用显著,之后随着风量增加,降温幅度降低.
In order to study the variation law of air temperature in tunnel, a mathematical model of temperature calculation in the tunnel head area under stable state is established based on the heat balance equation. The accuracy of the temperature calculation model is verified by numerical simulation software and the model is modified. Results show that the maximum relative error between the calculated air temperature and the simulated value is 5.96%, which is changed to 1.73% after adding additional items.The mathematical model of temperature calculation can be used to calculate the average air temperature in the head-on area under different working conditions. The temperature in the tunnel is affected by the surrounding rock temperature and air supply volume. With the increasing of air supply time, the air temperature in the heading area increased first and then reached a stable state. When the surrounding rock temperature rised by 5 ℃, the average air temperature is raised by about 1℃. The change rate of air temperature under different surrounding rock temperatures is basically the same. When the air volume increasesfrom 20 m;/s to 30 m;/s, the cooling effect is significant, and then the cooling range decreases with the increase of air volume.
作者
夏卫东
刘何清
杨恩慧
XIA Weidong;LIU Heqing;YANG Enhui(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《矿业工程研究》
2021年第4期60-66,共7页
Mineral Engineering Research
关键词
施工隧道
迎头区域
温度计算
数值模拟
construction tunnel
head-on area
temperature calculation
numerical simulation
