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CRYOGENIC TREATMENT OF SHAFTS AND TUNNELS

G P Harris

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Abstract

One of the geotechnical processes able to contend with unstable or saturated soil conditions in civil or mining engineering, is that of soil-freezing. In this technique, a temporary conversion of the interstitial soil moisture forms a strong and impermeable frozen soil membrane around the excavation zone. With the development of cryogenic techniques, nitrogen is available in liquid form offering a rapid means of soil freezing. Typical applications of the technique include shaft deepening tunnel faces, sealing gaps in cofferdams and wherever temporary structural support is needed. Two examples are given of the use of soil freezing on a sewer tunnelling project in Edinburgh. /TRRL/

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What this paper is about

One of the geotechnical processes able to contend with unstable or saturated soil conditions in civil or mining engineering, is that of soil-freezing. In this technique, a temporary conversion of the interstitial soil moisture forms a strong and impermeable frozen soil membrane around the excavation zone. With the development of cryogenic techniques, nitrogen is available in liquid form offering a rapid means of soil freezing. Typical applications of the technique include shaft deepening tunnel faces, sealing gaps in cofferdams and wherever temporary structural support is needed. Two examples are given of the use of soil freezing on a sewer tunnelling project in Edinburgh. /TRRL/

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Available abstract

One of the geotechnical processes able to contend with unstable or saturated soil conditions in civil or mining engineering, is that of soil-freezing. In this technique, a temporary conversion of the interstitial soil moisture forms a strong and impermeable frozen soil membrane around the excavation zone. With the development of cryogenic techniques, nitrogen is available in liquid form offering a rapid means of soil freezing. Typical applications of the technique include shaft deepening tunnel faces, sealing gaps in cofferdams and wherever temporary structural support is needed. Two examples are given of the use of soil freezing on a sewer tunnelling project in Edinburgh. /TRRL/

Key concepts: Geotechnical engineering, Excavation, Soil stabilization, Ground freezing, Engineering, Cofferdam, Civil engineering, Environmental science

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