Periodica Polytechnica Civil Engineering· 2017Q2
Investigation of Frost-Heaving Characteristics of Horizontal- Cup-Shape Frozen Ground Surface for Reinforced End Soil Mass in Shield Tunnel Construction
- 17citations
- Q2SCImago
- 2017year
Short summary
A cup-shape arrangement of horizontal freezing pipes in artificial ground freezing (AGF) for shield tunnels increases frost heave displacement with higher brine temperatures and deeper burial, but decreases it with thicker cup bottoms.
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Key points
- Cup-shape arrangement of horizontal freezing pipes influences ground surface frost-heaving.
- Increased brine temperature and burial depth lead to greater frost heave displacement.
- Increased cup bottom thickness reduces frost heave displacement.
- A numerical model coupling water-heat-force interactions was used for analysis.
AI-generated from the title and abstract; the full text is not read.
Abstract
Artificial freezing method is commonly adopted for reinforcingend soil mass of shield tunnel in the weak and rich aqueousformation, which is expected to prevent the construction riskin the originating and arriving of shield machine, whereas thearrangement of freezing pipes is sometimes varied due to variouscomplex limitations, and the corresponding frost-heavingcharacteristics of ground surface also differs from others. Inthis paper, a case of artificial freezing end soil mass with cupshape arrangement of horizontal freezing pipes is studied byfield investigation and numerical analysis, in which a numericalmodel coupled with water-heat-force interactions is proposedfor appropriately evaluating the frost-heaving characteristicsof ground surface in artificial freezing method. Theresults demonstrate that all the considered factors on brinetemperature, buried depth and cup bottom thickness have significantlyinfluences of frost-heaving characteristics of groundsurface in the artificial ground freezing (AGF) with cup shapearrangement of horizontal freezing pipes, in which the frostheave displacement of horizontal-cup-shape frozen groundsurface is increased with the increasing brine temperature andburied depth, whereas that is decreased with the increasing cupbottom thickness.
The authors' abstract, as published at the source. Periodica Polytechnica Civil Engineering, 2017 · DOI ↗
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Field: General Engineering
General EngineeringEngineering