摘要
当采用杯型水平冻结工法作为盾构隧道端头地层加固方式时,确定冻结加固所需范围及加固工艺、掌握冻结帷幕温度场发展与分布规律等是需要解决的关键问题。结合南京地铁2号线逸仙桥站西端头盾构始发工程,对杯型冻结壁加固温度场发展与分布规律进行了研究。数值模拟结果表明:在设计冻结方案下,杯型冻结帷幕厚度满足加固范围要求,开始交圈时间由早到晚依次为外圈管>中圈管>内圈管,形成闭合的杯型冻结帷幕的时间为15天。
When cup-shaped horizontal freezing method is used to reinforce the strata at the end of shield tunnel, it is critical to determine the scope required by the freezing reinforcement and the reinforcing process, and to know the development and distribution rules of temperature field at the frozen curtain. For the shield lanuching project at the west end of Yixianqiao Station of Nanjing Metro Line 2, the development and distribution rules of the temperature field at cup-shaped frozen wall reinforcement were studied. The result of numerical simulation shows that, in the design proposal of freezing, the thickness of the cup-shaped frozen curtain may meet the requirement of the reinforcement scope; the initial enclosing time is outer, center and inner circle pipe in turn from early to late, and the it takes 15 days to form an enclosed cup-shaped frozen curtain.
出处
《路基工程》
2015年第4期20-22,共3页
Subgrade Engineering
基金
海南省教育厅高等学校科研项目(Hnky2015-10)
留学人员科技活动择优资助启动类项目(人社厅函[2014]240号)
海南大学中西部计划学科建设项目(ZXBJH-XK011)
五邑大学2015年教授启动基金资助项目(2015JS03)
关键词
盾构始发
杯型冻结
温度场
数值模拟
shield lanuching
cup-shaped freezing
temperature field
numerical simulation
