Construction of a 9700m, 180cm diameter effluent pipeline required tunnelling from an existing sewage treatment plant to a barrier island outfall structure. Construction of the tunnel required a launching shaft at the plant and a receiving shaft at the barrier island. Artificial ground freezing was specified as the method to provide temporary earth support and groundwater control at the launching shaft and selected by the contractor for the receiving shaft.
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Ground Freezing on a Large Scale and its Historical Importance in Deep Mine Development
This article reviews past mine projects throughout the world where ground freezing was essential for successful shaft sinking and surface drift construction.
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Design of ground freezing for cross passages and tunnel adits
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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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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