季节性冻土区隧道温度场分析与预测
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摘要
为预防季节性冻土区隧道因防寒保温措施设置不足引发的冻害,研究季节性冻土区吐库二线中天山隧道温度场变化规律及其防寒保温参数。基于围岩温度场现场测试研究,利用ANSYS有限元软件,同时考虑水文地质条件、混凝土衬砌水化热、大气温度和地温随时间变化等影响因素,预测、比较隧道施加保温层和未施加保温层的冻融循环圈。总结出设置保温边沟和设置厚度≥5cm、导热系数≤0.03 W/(m·K)的保温层是必要和合理的。
The temperature field variation rules and thermal retardation parameters of Zhongtianshan tunnel on Turpan-Korla railway located in seasonal frozen area are studied,so as to avoid damages caused by insufficient thermal retardation countermeasures.Prediction and comparison and contrast are made on the freezing-thawing cycle ring of tunnels with and without thermal retardation layers,by means of ANSYS FE software and on basis of field tests on the temperature field of the rock mass,with such influence factors as the hydrogeology conditions,the hydration heat of the concrete lining,the atmospheric temperature and the ground temperature being considered.It is concluded that it is necessary to install thermal retardation side ditches,as well as thermal retardation layers with their thickness being more than 5 cm and their thermal conductivity being smaller than 0.03 W/(m·K).
The temperature field variation rules and thermal retardation parameters of Zhongtianshan tunnel on Turpan-Korla railway located in seasonal frozen area are studied,so as to avoid damages caused by insufficient thermal retardation countermeasures.Prediction and comparison and contrast are made on the freezing-thawing cycle ring of tunnels with and without thermal retardation layers,by means of ANSYS FE software and on basis of field tests on the temperature field of the rock mass,with such influence factors as the hydrogeology conditions,the hydration heat of the concrete lining,the atmospheric temperature and the ground temperature being considered.It is concluded that it is necessary to install thermal retardation side ditches,as well as thermal retardation layers with their thickness being more than 5 cm and their thermal conductivity being smaller than 0.03 W/(m·K).
引文
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[3]何春雄,吴紫汪,朱林楠.严寒地区隧道围岩冻融状态分析的导热与对流换热模型[J].中国科学,1999,29(S1):1-7.
[4]赖远明,吴紫汪,张淑娟,等.寒区隧道保温效果的现场观察研究[J].铁道学报,2003,25(1):82-87.(LAIYuanming,WU Ziwang,ZHANG Shujuan,et al.In-situ ob-served study for effect of heat preservation in cold regionstunnels[J].Journal of the China Railway Society,2003,25(1):82-87.(in Chinese))
[5]赖远明,吴紫汪,朱元林,等.寒区隧道地震响应的弹粘塑性分析[J].铁道学报,2000,22(6):85-90.(LAIYuanming,WU Ziwang,ZHU Yuanlin,et al.Elastic visco-plastic analysis of earthquake response of tunnels in cold re-gions[J].Journal of the China Railway Society,2000,22(6):85-90.(in Chinese))
[6]赖远明,喻文兵,吴紫汪,等.寒区圆形截面隧道温度场的解析解[J].冰川冻土,2001,23(2):26-30.(LAIYuanming,YU Wenbing,WU Ziwang,et al.Approximate an-alytical solution for the temperature fields of a circular tunnelin cold regions[J].Journal of Glaciology and Geocryoiogy,2001,23(2):26-30.(in Chinese))
[7]王星华.高原多年冻土隧道工程研究[M].北京:中国铁道出版社,2007.
[8]刘小刚.青藏铁路多年冻土隧道隔热保温研究[J].隧道建设,2010,30(3):225-230.(LIU Xiaogang.Study onthermal insulation of tunnels permaftost soil on Qinghai-TibetRailway[J].Tunnel Construction,2010,30(3):225-230.(in Chinese))
[9]向敏,杨从娟.高强混凝土水化放热规律研究[J].混凝土,2003(3):27-29,43.(XIANG Min,YANG Congjuan.Studyof the hydro-thermal dissipation law of high strength concrete[J].Concrete,2003(3):27-29,43.(in Chinese))
[10]李东,潘育耕.混凝土水化热瞬态温度场数值计算过程中的水化放热规律及水化速率问题[J].西安建筑科技大学学报:自然科学版,1999(3):75-77.(LI Dong,PAN Yu-geng.Law and velocity of hydro-thermo dissipation in the cal-culation of concrete transient temperature field[J].Journal ofXi’an University of Architecture&Technology:Natural Sci-ence Edition,1999(3):75-77.(in Chinese))
[11]白国权.高海拔严寒地区隧道温度场分布规律及衬砌冻胀力数值模拟研究[D].成都:西南交通大学桥梁与隧道工程专业,2006.
[12]夏永旭.隧道结构力学计算[M].北京:人民交通出版社,2001.
[13]罗彦斌,陈建勋,王梦恕.隧道冻害等级的划分[J].北京工业大学学报,2010(4):32-36.(LUO Yanbin,CHEN Jianxun,WANG Mengshu.Classification of frostdamage grades in tunnel[J].Journal of Beijing University ofTechnology,2010(4):32-36.(in Chinese))
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