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Study on Freezing Project Affected by Frost-Heaving and Thawing-Settlement Applied in Construction of Subway Tunnel in the Coastal Regions

Author: HeShuMei
Tutor: XuCunDong
School: Lanzhou University of Technology
Course: Water Resources and Hydropower Engineering
Keywords: Subway Tunnel Artificial freezing method Temperature field Frost heave Thaw settlement
CLC: U455.49
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 4
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Abstract


In recent years , the freeze law has gradually developed into one of the tunnel construction , especially in the coastal areas of tunnel construction auxiliary methods . Although artificial horizontal ground freezing method has many advantages , but the level of impact to freeze construction method of the factors are many artificial horizontal ground freezing method , there are still some problems . Including the freezing process , frost heaving and thawing after thawing subsidence problems , these may often cause deformation of the surface displacement . Since the subway tunnels are generally built in the city , and most are in the downtown area of the city , so any form of surface displacement and deformation will lead to serious consequences . Firstly, the theoretical characteristics of freezing wall temperature field derived the law of the formation of the frozen wall . Secondly , through numerical simulation , analysis of the impact of frost heaving of the ground surface deformation in the freezing process . In this paper, in the process of frost heave simulation equivalent load method and the incremental method , by the grading load solving linear approximation nonlinear solution under full load , the system to study the design parameters of the tunnel , building loads quantify the impact of the law on the coastal areas of of frost heave sensitivity of soil surface frost heave displacement and other related factors . Thaw caused problems when the thaw in the study , analysis of the characteristics of artificial frozen soil thaw settlement and artificial level freeze thaw in the soil caused by thaw deformation simplified simulation method : soil \\design parameters and building load factors on coastal areas of freezing construction method of surface financial the Shen displacement quantify the impact of the law . This paper presented the results of numerical experiments based on the appropriate measures to reduce the displacement and deformation of the surface frost heave and financial Shen displacement and deformation .

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Adverse geology, underwater tunnel construction helper method
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