冻土帷幕界面设置加热限位管时温度场数值分析  

Numerical Simulation of Temperature Field based on Frozen Soil Curtain Tube with Thermal Heat Limit

作　　者：胡俊[1,2] 卫宏[1] 刘勇[2] 赵联桢[1] 

机构地区：[1]海南大学土木建筑工程学院,海口570228 [2]新加坡国立大学土木与环境工程系,新加坡肯特岗117576

出　　处：《森林工程》2016年第4期70-74,96,共6页Forest Engineering

基　　金：国家自然科学基金项目(51368017);海南省科技项目(ZDXM2015117);海南省重点研发计划科技合作方向项目(ZDYF2016226);中国博士后科学基金资助项目(2015M580559);海南省教育厅高等学校科研项目(Hnky2015-10)

摘　　要：为解决现有人工冻结法施工后周围地层产生冻胀融沉所引发不良后果的问题,可设置加热限位管对冻土帷幕的发展进行限制,从而达到控制冻胀融沉的目的。本文运用有限元软件研究在冻土帷幕界面上设置加热限位管时对冻土帷幕温度场发展的影响规律,主要得出:加热限位管盐水温度每升高5℃,冻土帷幕厚度就减小约0.2 m;在已冻结30 d,冻土厚度发展到1.6 m冻土上,加热限位管循环5℃盐水时,随着时间的增加冻土厚度慢慢变小,加热限位管作用效果明显;在限位管开始循环热水前期,各点温度都有明显上升,离限位管越近温度所受影响越大;随着时间的推移,各点温度趋于稳定,循环热盐水温度越高,趋于稳定的温度值也越高。所得结果可为今后类似工程设计提供参考依据。In order to solve the problem of the existing artificial freezing method after construction that the surrounding formation may produce frost thaw settlement,which can cause adverse consequences,the heating limit can be used for the development of frozen soil wall pipe to limit thickness,so as to control frost thaw settlement. In this study,the finite element method was used to study the influence of temperature field of frozen soil curtain development when setting the heating limit pipe,the main conclusions were： the temperature increase of brine in the heating limit pipe by 5℃ will cause the reduction of frozen soil wall thickness by about 0. 2 m;When the frost was lasting for 30 days and the permafrost thickness reached 1. 6 m,the permafrost thickness gradually decreased as time increased with 5℃ brine,and the heating effect of limiting tube was obvious. Before circulating the brine,the temperature at each point increased significantly and the closer to the tube the greater the impact. As the time went on,the temperature at each point tended to stabilize,and the higher the circulating hot brine temperature the higher the stable temperature. The results can provide a theoretical reference for future similar projects.

关 键 词：加热限位管 冻结法 冻胀融沉 数值模拟 

分 类 号：TU753[建筑科学—建筑技术科学]