Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Artificial Freezing Method in Geotechnical and Tunneling Applications
The artificial freezing of soils for sealing and solidifying the subsoil has a long tradition. Originally developed for shaft construction in water-bearing soil and rock, where it is still used today, the artificial freezing method has recently also been increasingly used in tunnel construction. The main areas of application are the extension of mechanically driven segment tubes to underground stations and the subsequent construction of cross passages between the separate tunnel tubes. Both brine freezing and the liquid nitrogen method are used. The freezing method can be used in almost all soils, is easy to control and due to the latent heat, it has sufficient reserves in the event of temporary failure of the freezing equipment. In addition, the frozen area can practically be restored to its original state after the freezing measure has been completed. The procedure finds limits because of the strong heat input at higher groundwater velocities. In addition, the unavoidable heave in cohesive soils due to the volume expansion of the water and the formation of ice lenses often pose a problem, which, however, can be countered to a limited extent by appropriate operation of the freezing plant. The paper shows different applications and limits of the freezing process in geotechnical practice and tunneling.
Artificial Freezing Method in Geotechnical and Tunneling Applications
The artificial freezing of soils for sealing and solidifying the subsoil has a long tradition. Originally developed for shaft construction in water-bearing soil and rock, where it is still used today, the artificial freezing method has recently also been increasingly used in tunnel construction. The main areas of application are the extension of mechanically driven segment tubes to underground stations and the subsequent construction of cross passages between the separate tunnel tubes. Both brine freezing and the liquid nitrogen method are used. The freezing method can be used in almost all soils, is easy to control and due to the latent heat, it has sufficient reserves in the event of temporary failure of the freezing equipment. In addition, the frozen area can practically be restored to its original state after the freezing measure has been completed. The procedure finds limits because of the strong heat input at higher groundwater velocities. In addition, the unavoidable heave in cohesive soils due to the volume expansion of the water and the formation of ice lenses often pose a problem, which, however, can be countered to a limited extent by appropriate operation of the freezing plant. The paper shows different applications and limits of the freezing process in geotechnical practice and tunneling.
Artificial Freezing Method in Geotechnical and Tunneling Applications
Lecture Notes in Civil Engineering
Petriaev, Andrei (Herausgeber:in) / Konon, Anastasia (Herausgeber:in) / Ziegler, Martin (Autor:in)
03.01.2020
9 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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