摘要
港珠澳大桥珠海连接线拱北隧道工程预支护体系采用管幕法与人工冻结技术相结合的全新"管幕冻结法"施工。根据工程实际情况,首次提出了在管幕钢管内部布置"圆形主力冻结管"、"异形加强冻结管"和"升温盐水限位管"三种特殊管路构成的冻结方案。为了研究该冻结方案的有效性与可控性,进行了大型物理模型试验。文章主要介绍了模型试验概况,重点分析了开挖前积极冻结阶段冻结的试验效果。试验结果表明,积极冻结阶段冻土帷幕发展显现了预期规律,冻结效果显著;管幕间形成良好的冻土帷幕,可确保良好的止水效果。
The pre-supporting system of the Gongbei tunnel situated at the Zhuhai Link of the Hong Kong-Zhuhai-Macao Bridge,was constructed by a new construction method,the Freeze-Sealing Pipe-Roof（FSPR）method,which combines pipe-roof reinforcement with artificial freezing technology.According to practical conditions,this paper proposes for the first time a freezing scheme composed of three special types of pipes arranged inside the steel tubes of the pipe-roof system,i.e.the circular main freezing pipe,the specially shaped intensive freezing pipe,and the heat brine pipe for limiting the over-growth of the frozen body.A large-scale physical model test was carried out to study the validity and controllability of this freezing scheme.This paper briefly introduces the model test,focusing on the experimental study of the freezing effects at an active freezing stage before excavation.The test results show that the development of a frozen curtain is of expected regularity,the freezing effect is remarkable,and the frozen curtain is formed between pipe roofs,which guarantees a good sealing effect.
出处
《现代隧道技术》
EI
北大核心
2014年第5期92-98,共7页
Modern Tunnelling Technology
基金
国家自然科学基金资助项目(51178336)
交通运输部建设科技项目(2013318J11300)
关键词
港珠澳大桥
拱北隧道
管幕冻结法
模型试验
冻结方案
Hong Kong-Zhuhai-Macao Bridge
Gongbei Tunnel
the Freeze-Sealing Pipe-Roof（FSPR） method
Model test
Freezing scheme
