Classification and Laboratory Testing of Artificially Frozen Ground

Sayles, Francis H.; Baker, T. H. W.; Gallavres, F.; Jessberger, H L; Kinosita, Seiiti; Sadovskiy, A. V.; Sego, David C.; Vyalov, S. S.

doi:10.1061/(asce)0887-381x(1987)1:1(22)

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…Die zylindrischen Proben im Gerät haben standardmäßig einen Durchmesser von 10 cm und eine Höhe von 15 cm. Da das in den ISGF‐Empfehlungen [21] angegebene Verhältnis Höhe zu Durchmesser 2:1 unterschritten wird, muss eine adäquate Schmierung der Endflächen erfolgen. Hierzu wird zwischen Endplatte (Metall) und Probe eine Latex‐Gleitmembran eingebaut.…”

Section: Versuchstechnikunclassified

Einaxiale und triaxiale Druckversuche an gefrorenen Sanden und Tonen – Einfluss von Sättigung und Temperatur

Vrettos,

Seibel,

Günther

2023

Geotechnik

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Eine Teilsättigung führt bei gefrorenen Sanden und Kiesen zu einer signifikanten Abnahme der Kurz‐ und Langzeitfestigkeit, sodass bei Anwendung des Gefrierverfahrens die Standsicherheit des Frostkörpers beeinträchtigt werden kann. Zur Ermittlung der einaxialen Druckfestigkeit, des Kriechwiderstands sowie der Scherparameter wurden an Sanden einaxiale und triaxiale Druckversuche mit einer Kühlung am Gerät durchgeführt. Die Ergebnisse bestätigen und vervollständigen die Erkenntnisse aus früheren, vereinzelten Studien. Untersuchungen an ungestörten mittelplastischen und ausgeprägt plastischen Tonproben mit der gleichen Versuchstechnik verdeutlichen den Einfluss der Konsistenzgrenzen und die Zunahme der Kurz‐ und Langzeitfestigkeit bei tieferen Temperaturen.

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Section: Versuchstechnikunclassified

Einaxiale und triaxiale Druckversuche an gefrorenen Sanden und Tonen – Einfluss von Sättigung und Temperatur

Vrettos,

Seibel,

Günther

2023

Geotechnik

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“…Before construction of the twin-tunnel, an initial in-situ investigation was accomplished, with soil parameters as listed in Table 1. In this project, refrigerant was chilled brine, and temperature was −28 • C [31]. According to the indoor experimental results, the thickness of a frozen wall was set to be 2 m. A total of 76 horizontal freezing pipes were drilled with a diameter of 108 mm, which were arranged in a circle with a radius of 4.9 m. Here it is worth noting that, a massive amount of soil was frozen during the construction process.…”

Section: Modeling Testmentioning

confidence: 99%

“…To limit the movement of upper structures and remain construction safety, some advanced research on frost heave has been carried out based on a prototype project. Here, a similarity simulation method is an effective means to investigate complex problems in engineering projects [28][29][30][31][32][33]. The freezing similarity simulation experiments have also been adopted for predicting frost heave and settlement in the AGF engineering cases.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Wang

et al. 2019

Applied Sciences

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The high risk of metro tunnels that are underneath buildings in a water-rich layer has received much attention. The base slab of an upper structure deforms due to frost heave and settlement, which needs to be predicted before freezing and excavation. In this paper, simulation experiments with a similarity ratio of 1/25 were performed based on an engineering project where two tunnels underpass a running station through an artificial ground freezing method. The displacement of upper structures was analyzed under simultaneous and sequential freezing modes, with a simple formula proposed to estimate the frost heave in closely underpassing projects. It is shown that, under freezing and excavation stages, the base slab displacement displays a zigzag shape. These results are instructive to the construction of underpassing projects in a water-rich layer.

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“…The block diagram of the components included in the newly fabricated triaxial test system to conduct investigation on frozen soil samples is shown in the Fig 1. Due to its limited and specific applications, triaxial compression apparatus for frozen soils is not readily available in the market. For this study, a stress controlled triaxial compression apparatus was designed and manufactured to suit the present laboratory conditions [9]. Thus, the newly fabricated triaxial test system consist of following units…”

Section: Laboratory Setup For Artificial Soil Freezingmentioning

confidence: 99%

Experimental Investigation on Shear Strength of Artificially Frozen C - Phi Soil

L¹,

Rasheed²,

Koshy³

2019

IJPTM

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Artificial Ground Freezing (AGF) is a construction technique which has been in practice for over a century, mainly in the cold regions of the world. AGF is considered as a ground improvement technique which can improve the site conditions for various civil engineering projects. It is typically used for ground stabilization and ground water control for wide variety of applications in all soil types. In-depth knowledge of the frozen soil characteristics through experiments and the development of suitable constitutive models that suit the geological conditions of our country are necessary to predict the strength and behaviour of the frozen soils. The strength and mechanical behaviour of this material can be determined experimentally and can be even predicted numerically. As this technology is not yet explored in our country an apparatus to test the strength of frozen soil in the triaxial condition is not yet developed in the laboratory. As part of this study a triaxial compression apparatus is designed and fabricated to test frozen soil samples incorporating the features of the existing triaxial apparatus on the basis of the reviewed literature and hence determining the shear parameters and strength of C-Phi soil. A more precise strength comparison between the frozen and unfrozen soil sample is done effectively in this investigation.

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Classification and Laboratory Testing of Artificially Frozen Ground

Cited by 14 publications

References 28 publications

Einaxiale und triaxiale Druckversuche an gefrorenen Sanden und Tonen – Einfluss von Sättigung und Temperatur

Einaxiale und triaxiale Druckversuche an gefrorenen Sanden und Tonen – Einfluss von Sättigung und Temperatur

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Experimental Investigation on Shear Strength of Artificially Frozen C - Phi Soil

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