双圈管冻结壁温度场形成特性及影响因素  

Influence factors and formation properties of temperature field in the frozen wall of double ring pipes

作　　者：李怀鑫 林斌[1] 王鹏 LI Huaixin;LIN Bin;WANG Peng(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;China Railway 14th Bureau Group Co.Ltd.,Jinan 250000,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]中铁十四局集团有限公司,山东济南250000

出　　处：《煤田地质与勘探》2020年第3期169-175,共7页Coal Geology & Exploration

基　　金：教育部高校博士点专项科研基金项目(200803610004);安徽理工大学研究生创新基金项目(2019cx2017)。

摘　　要：为研究双圈管冻结壁温度场变化规律,以淮南某矿副井为研究对象,根据其相关地质参数,利用FLAC3D软件数值模拟双圈管冻结壁温度场形成过程以及不同因素对冻结壁平均温度的影响。研究结果表明:双圈管内土体温度最低,两侧温度逐渐升高;冻结孔间距越小,交圈时间越早,内外圈管交圈之后形成封闭的未冻承压水仓,对冻结壁不利,冻结锋面向内侧扩展速度大于向外侧扩展速度;双圈管冻结壁平均温度与冻结时间呈对数关系下降,有效厚度在内外圈管交圈后增长十分明显,且与冻结时间呈对数关系上升;双圈管主、界面温度场曲线随冻结时间近似由马鞍形分布逐渐转变为梯形分布,界面温度场扩展速度大于主面温度场;土体初始温度、盐水温度及导热系数对冻结壁平均温度影响均较大,土体初始温度和盐水温度越低、导热系数越大,冻结壁平均温度越低。研究成果为相关冻结工程的设计和施工提供参考。In order to research the change law of the temperature field of the frozen wall of double-circle pipes,an auxiliary shaft in Huainan coalmine was taken as the research object,the FLAC3D software was used to numerically simulate the formation process of the temperature field of the frozen wall of double-circle pipes and the influence of different factors on average temperature of frozen wall based on the relevant geological parameters.The research results show that temperature of the soil in the double-circle pipes is the lowest,and temperature on both sides increases gradually,the interval between frozen holes is smaller,the time of circulation is earlier,and the closed unfrozen pressurized water tank is formed after the inner and outer ring pipes are in contact,which is unfavorable to the frozen wall,the frozen front face in the inner side expands faster than that in the outer side;average temperature of frozen wall of double-circle pipes decreases with freezing time in a logarithmic relationship,the effective thickness increases obviously after the intersection of the inner and outer rings,and increases approximately logarithmically with freezing time;temperature field curve of main and interface of double-circle pipes changes gradually from saddle-horse shape to trapezoidal distribution with freezing time,interface temperature field expansion speed is greater than main surface temperature field;the initial temperature,brine temperature and thermal conductivity of the soil have a great influence on the average temperature of frozen wall,the lower initial temperature and brine temperature,the higher the thermal conductivity is,the lower the average temperature of frozen wall is.The research results provide reference for the design and construction of the related freezing project.

关 键 词：双圈管 冻结壁温度场 数值模拟 平均温度 影响因素 淮南 

分 类 号：TU443[建筑科学—岩土工程]