异形加强冻结管外壁保温对管幕冻结效果影响试验研究

任辉; 洪泽群; 张军

doi:10.3973/j.issn.2096-4498.2024.01.008

隧道建设 >

2024 , Vol. 44 >Issue 1: 100 - 108

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.01.008

研究与探索

异形加强冻结管外壁保温对管幕冻结效果影响试验研究

任辉 ,
洪泽群 ,
张军

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(1. 珠海市轨道交通有限公司，广东珠海 519060； 2. 中国矿业大学，江苏徐州 221116； 3. 中交第二公路勘察设计研究院有限公司，湖北武汉 430056)

任辉（1986—），男，湖南常德人，2015年毕业于同济大学，建筑与土木工程隧道及地下建筑工程专业，硕士，高级工程师，主要从事隧道及地下工程建设与研究工作。E-mail： ren445@126.com。*通信作者：洪泽群， E-mail： zqhong@cumt.edu.cn。

网络出版日期: 2024-02-04

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Experimental Study on Outer Insulation Influence of Profiled Enhancing Freezing Pipes on Effect of FreezeSealing Pipe Roofs

REN Hui ,
HONG Zequn ,
ZHANG Jun

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(1. Zhuhai Rail Transit Co., Ltd., Zhuhai 519060, Guangdong, China; 2. China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; 3. CCCC Second Highway Consultants Co., Ltd., Wuhan 430056, Hubei, China)

Online published: 2024-02-04

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摘要

新型管幕冻结法冻结系统由充填混凝土的实顶管内布置圆形主力冻结管和限位管、未充填混凝土的空顶管内布置异形加强冻结管组成。为分析该新型管幕冻结系统中空顶管周围的冻结效果，通过拱北隧道管幕冻结现场原型试验，对空顶管中异形加强冻结管是否采取外表面保温措施展开研究，利用冻土帷幕厚度的变化对异形加强冻结管保温措施与不保温状态进行冻结效果对比分析。结果表明：异形加强冻结管保温不利于冻土帷幕的形成，随着冻结时间推移，冻土帷幕的发展会越来越慢；协同冻结模式下60 d后保温与不保温的冻土厚度之差约为冻结20 d的2倍。可以把空顶管作为“大冻结管”来考虑，利用异形加强冻结管对空顶管内部整体降温，更有利于顶管周围冻土帷幕的发展。

关键词： 管幕冻结法; 异形加强冻结管; 冻结管保温; 现场试验; 拱北隧道

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任辉 , 洪泽群 , 张军 . 异形加强冻结管外壁保温对管幕冻结效果影响试验研究[J]. 隧道建设, 2024 , 44(1) : 100 -108 . DOI: 10.3973/j.issn.2096-4498.2024.01.008

Abstract

The freezing scheme of the freezesealing pipe roof method comprises circularmain freezing and limiting pipes arranged in a solid jacking pipe filled with concrete and a profiled enhancing freezing pipe arranged in an empty jacking pipe. To examine the freezing effect around the empty jacking pipe of this novel freezing system, an onsite prototype test is conducted in the Gongbei tunnel. The influence of external surface insulation of the profiled enhancing freezing pipe in the empty jacking pipe on the freezingsealing effect is investigated based on the variation in the thickness of the frozen soil curtain. The results show that the insulation of the external surface of the jacking pipe is not conducive to the formation of the frozen soil curtain, and the formation rate of the frozen soil curtain decreases with freezing time. In addition, the thickness difference of frozen soil between the insulated and uninsulated cases at 60 days in the synergistic freezing mode is approximately twice that of 20 days of freezing. The empty pipe jacking can be considered as a "big freezing pipe", and overall cooling inside can be achieved using the profiled enhancing freezing pipe, which is more conducive to the formation of the frozen soil curtain around the jacking pipes.

Key words： freezesealing pipe roof; profiled enhancing freezing pipe; freezing pipe insulation; field test; Gongbei tunnel

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