基于对流-导热耦合模型的无压引水隧洞围岩温度场研究  

Study on temperature field of surrounding rock of non-pressure diversion tunnel based on convection-thermal coupling model

作　　者：孟尧 MENG Yao(Xinjiang Institute of Water Resources and Hydropower Survey and Design,Urumqi 830000)

机构地区：[1]新疆水利水电勘测设计研究院,乌鲁木齐830000

出　　处：《水科学与工程技术》2022年第3期41-45,共5页Water Sciences and Engineering Technology

摘　　要：为了研究无压引水隧洞温度场的变化规律,以新疆某无压引水隧洞为依托,采用有限元数值模拟,对无压引水隧洞运行时围岩温度场进行详细分析。结果表明:隧洞顶部径向围岩在0~2m范围内温度先降低后升高。围岩最低温度开始出现在隧洞顶部围岩洞壁处,随后慢慢向径向距离0.7m处转移,约-2.2℃。通水水温对隧洞围岩的温度有重要影响,可以在一定程度上减小通风对隧洞围岩温度的影响。设置衬砌保温层结构能够有效的避免围岩因为负温发生冻胀破坏。In order to study the variation law of temperature field of a non-pressure diversion tunnel,based on a non-pressure diversion tunnel in Xinjiang,the temperature field of surrounding rock during the operation of the non-pressure diversion tunnel was analyzed in detail by finite element numerical simulation.The results show that the temperature of the radial surrounding rock at the top of the tunnel decreases first and then increases in the range of 0m-2m.The lowest temperature of surrounding rock begins to appear at the wall of surrounding rock at the top of the tunnel,and then slowly shifts to the radial distance of 0.7m,about-2.2℃.The water temperature has an important influence on the temperature of surrounding rock of tunnel,which can reduce the influence of ventilation on surrounding rock temperature to a certain extent.Setting the lining insulation layer structure can effectively avoid the frost heave failure of surrounding rock due to negative temperature.

关 键 词：寒区 无压引水隧洞 对流-导热耦合模型 温度场 

分 类 号：TV222[水利工程—水工结构工程]