ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction >

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

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

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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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 onsite 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 freezingsealing 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

Cite this article

REN Hui , HONG Zequn , ZHANG Jun .

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

[J]. Tunnel Construction, 2024 , 44(1) : 100 -108 . DOI: 10.3973/j.issn.2096-4498.2024.01.008

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