Ground freezing has been used extensively in the last ten years for the construction of transit tunnel cross passages and SEM tunnels, as well as short adits for utility tunnels. This paper discusses the design procedures related to frost action.
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Factor of safety in ground freezing design
Design of frozen earth structures for shafts, tunnels, and cross passages has evolved since the publication of guidelines in 2002 by the Working Committee of the International Sym-posium on Ground Freezing. The finite element model allows more specific analysis of a frozen structure cross section and adjusting strength parameters based on temperature and time-dependent strength reduction.
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New Design Method for Frozen Earth Shaft Support
The first documented procedures for designing frozen earth structures are over 50 years old, implemented long before the introduction of the Finite Element Method (FEM). Since that time, the development of three-dimensional models has made the traditional and often over-conservative methods relatively obsolete.
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The Use of Liquid Nitrogen Systems Converted to Brine
There has been a trend in recent years in performing the initial formation freezing using liquid nitrogen (LIN) and then converting the system to circulating refrigerated brine. While proponents of this method state it decreases freezing time, it can also be considered an alternative to inadequate refrigeration capacity.
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Shaft Freezing in Buenos Aires
Ground freezing was used to complete a shaft excavation that had been previously attempted using a slurry diaphragm wall and jet grouting. The freezing was completed around both the damaged shaft and the existing tunnel.
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Sistema de Potabilización Área Norte – Access Shaft #3
After groundfreezing, the joint venture was successfully able to construct a permanent access shaft structure without any of the prior leaks, soil movement, or other problems.
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