双圆盾构隧道杯型冻结壁温度场数值优化分析  

Numerical Optimization Analysis of Temperature Field of Cup-shaped Frozen Wall of Double-Circle Shield Tunnel

作　　者：潘名芳 董勤喜 胡俊[1] 曾晖[2] PAN Mingfang;DONG Qinxi;HU Jun;ZENG Hui(College of Civil Engineering and Architecture,Hainan University,Haikou 570228,China;College of Civil Engineering and Architecture,Wuyi University,Jiangmen 529020,China)

机构地区：[1]海南大学土木建筑工程学院,海口570228 [2]五邑大学土木建筑学院,广东江门529020

出　　处：《森林工程》2022年第3期122-133,共12页Forest Engineering

基　　金：海南省科技厅自然科学基金创新研究团队项目(522CXTD511);2021年度广东高校科研平台和科研项目特色创新(自然科学)项目(2021KTSCT139)。

摘　　要：为得到双圆盾构隧道始发端头应用水平杯型冻结法进行加固时的温度场变化规律,该文结合上海市轨道交通6号线某双圆盾构隧道区间工程,通过使用有限元数值模拟软件建立数值模型,分析初始模型设计102根冻结管时双圆盾构隧道端头杯型冻结壁温度场的发展规律,并提出2种优化方案:方案1为内圈、中圈、外圈冻结管根数分别减少2、4、6根;方案2为内圈、中圈、外圈冻结管根数分别减少4、6、10根,分析对比初始模型以及2个优化方案的冻结效果。结果表明,在冻结开始后,冻土帷幕围绕各冻结管呈圆柱形逐渐向外延伸,距离冻结管越近,冻结效果越好;冻土帷幕依次按外圈管到中圈管,再到内圈管的次序开始交圈,冻结第18天形成一个形状规则、强度分布均匀的近似双圆杯型冻结壁;双圆杯型冻结壁杯底长度10.2 m,杯身高度4.4 m,杯壁厚度2 m,杯底厚度2 m;优化前初始冻结方案使用102根冻结管符合施工要求,冻结效果良好,在实际施工中具有可行性,但偏于保守,2种优化方案在减少冻结管数量后依然满足盾构始发杯型冻结壁杯体要求。In order to obtain the variation law of temperature field at the starting end of double-circle shield tunnel reinforced by horizontal cup freezing method,combined with a double-circle shield tunnel section project of Shanghai Rail Transit Line 6,this paper established a numerical model by using finite element numerical simulation software,analyzed the development law of temperature field of cup-shaped frozen wall at the end of double-circle shield tunnel when the initial model designed with 102 frozen pipes.Two optimization schemes were put forward:scheme 1 was reducing the number of freezing pipes in inside,center and outside circles by 2,4 and 6 respectively;scheme 2 was reducing the number of freezing pipes in inside,center and outside circles by 4,6 and 10 respectively.The freezing effects of the initial model and two optimization schemes were analyzed and compared.The results showed that:at the beginning of freezing,the frozen soil curtain gradually extended outward around each freezing pipe in a cylindrical shape,and the closer it was to the freezing pipe,the better the freezing effect.The frozen soil curtain began to cross in the order of outer circle,center circle and inside circle,and formed an approximate double-round cup-shaped frozen wall with regular shape and uniform strength distribution on the 18 th day of freezing.The length of double round cup-shaped frozen wall cup bottom was 10.2 m,the height of cup body was 4.4 m,the thickness of cup wall was 2 m,and the thickness of cup bottom was 2 m.The initial freezing scheme which using 102 freezing pipes met the construction requirements,the freezing effect was good,and it was feasible in actual construction,but it was conservative.The two optimization schemes still met the starting cup-shaped freezing wall cup of shield machine requirements after reducing the number of freezing pipes.

关 键 词：隧道 双圆盾构 端头加固 数值模拟 杯型冻结壁 冻结法 

分 类 号：S773[农业科学—森林工程] U455.43[农业科学—林学]