高承压富含水层人工强制解冻温度场数值分析  

Numerical Analysis of Artificial Thawing Temperature Field in High-confined Aquifer Reinforcement

作　　者：陈成[1] 杨平[1] 张婷[1] 

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《郑州大学学报（工学版）》2012年第2期81-85,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：住房和城乡建设部科学技术项目(2009-K3-2);江苏省普通高校研究生科研创新计划项目(CX09S_015Z);南京地铁有限公司科研项目(2011年度)

摘　　要：在含水层跨江跨海盾构隧道施工中,盾尾刷破坏后如何更换是目前需要解决的关键问题.结合杭州庆春路过江隧道盾尾刷更换工程,利用ADINA大型有限元软件建立三维数值模型人工强制解冻温度场进行数值模拟,研究了温度空间分布及温度随时间变化规律,并对影响解冻温度场的因素进行敏感性分析.通过数值模拟和现场原位实测的对比分析,得出了强制解冻温度场的发展规律:人工强制解冻的时间随着土体导热系数的增大而延长,随土体容积热容量的增大而延长,随着循环热水温度升高而缩短,随着土体相变潜热的增大而延长,缩短了承压含水层中封水更换盾尾刷后盾构机重新推进的时间.Liquefied nitrogen freezing replacement shield brushes tail in China is the first application in shield tunnel excavation.With Qingchun Road cross-river tunnel of Hangzhou as an example,this paper applies ADINA finite element calculation software to compute thermal field for artificial thawing 3-D model,studies thermal spatial distribution and the variation laws of temperature with time,and makes the sensitivity analysis for influence factors of thawing temperature field.Through the contrast analysis of numerical simulation and field measurement,we get the development regularity of artificial thawing temperature field： artificial thawing time is longer with the increase of thermal conductivity and the increase of heat capacity;the higher the circulation hot water temperature is,the shorter the time of thawing is shorter;artificial thawing time is longer with the increase of latent;which solves the problem of shield brushes tail replacement in high-confined aquifer.

关 键 词：强制解冻 承压含水层 冻结壁 温度场 数值分析 

分 类 号：TU472.9[建筑科学—结构工程]