Factors and Mechanism of Loess Collapsibility

Осипов, В. И.; Sokolov, V. N.

doi:10.1007/978-94-011-0097-7_4

Cited by 26 publications

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“…It has been believed by a majority of researchers investigating loessial soils that the collapsibility of loess decrease with an increase in content of low soluble salts and clay minerals, particularly of smectite and mixed -layered groups. However, no direct correlation between these factors and collapse potential was established (Osipov and Sokolov, 1995).…”

Section: Materials Characteristics Of Loess (I) Particle Sizementioning

confidence: 99%

“…The general index of initial water content for collapse of loess is defined as the minimum natural humidity to initiate collapse. Previous research shows that the initial degree of saturation for most collapses of loess varies from 15 to 19% (Osipov and Sokolov, 1995). The natural water content of most loess soils has been found to vary from 4 to 23% (Qian et al 1985;Derbyshire et al 1995).…”

Section: (Iii) Moisture Content and Index Propertiesmentioning

confidence: 99%

“…• The collapsibility of the soil and the overburden has been reported to vary from 5 to over 50-100 cm (Osipov and Sokolov, 1995). More than 60% of the land area in Mediterranean Europe consists of loess deposits (Poesen and Wesemael, 1995).…”

Section: Formation and Existence Of Collapsible Soilsmentioning

confidence: 99%

“…"loess" which means loose (Handy, 1995). Loess is generally characterized by its high content of dusty particles (as a rule, not less than 50%) (Osipov and Sokolov, 1995).…”

Section: Depositsmentioning

confidence: 99%

“…Table 2 -Index properties of some collapsible soils (after Tadepalli et al 1992;Pereira, 1996;Pereira and Fredlund, 2000). Humus (in humus interstrata and loess subsoils) -less than 1-2% humus (Ananyev, 1964;Sargeev et al 1986;Osipov and Sokolov, 1995).…”

Section: Materials Characteristics Of Loess (I) Particle Sizementioning

confidence: 99%

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Mechanical behavior of unsaturated compacted Iowa loess

Singhal¹

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Section: Materials Characteristics Of Loess (I) Particle Sizementioning

confidence: 99%

Section: (Iii) Moisture Content and Index Propertiesmentioning

confidence: 99%

Section: Formation and Existence Of Collapsible Soilsmentioning

confidence: 99%

“…"loess" which means loose (Handy, 1995). Loess is generally characterized by its high content of dusty particles (as a rule, not less than 50%) (Osipov and Sokolov, 1995).…”

Section: Depositsmentioning

confidence: 99%

Section: Materials Characteristics Of Loess (I) Particle Sizementioning

confidence: 99%

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Mechanical behavior of unsaturated compacted Iowa loess

Singhal¹

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Methode zur empirischen Prognose der Verformungen von sackungsanfälligen Lössböden

Meier¹,

Boley

2012

Bautechnik

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Forschungstätigkeiten auf dem Gebiet der Sackungsanfälligkeit von Lössböden waren insbesondere zwischen den 30er und 80er Jahren des 20. Jahrhunderts von nationaler Individualität gekennzeichnet. Erst seit Anfang der 80er Jahre, mit Aufstellung der Arbeitsgruppe “Geotechnical Properties of Loess” der International Union for Quarternary Research (INQUA), ist eine international referenzierende Forschung auf dem Gebiet der Erfassung bodenmechanischer Eigenschaften von Lössböden zu verzeichnen. Der Schwerpunkt bisheriger Forschungsarbeiten lag auf der Erarbeitung sogenannter Kollapskriterien zur qualitativen Abschätzung des Sackungspotenzials bei einem Anstieg des Wassergehalts. Bisher durchgeführte geochemische Untersuchungen von Lössböden beschreiben zwar die mineralische Zusammensetzung, geben jedoch nur eingeschränkt Aufschluss über die Löslichkeit dieser Bestandteile in Wasser oder deren Einfluss auf das Sackungsverhalten.Am Institut für Bodenmechanik und Grundbau der Universität der Bundeswehr in München wurde erstmals der Anteil leicht wasserlöslicher mineralischer Bestandteile eines afghanischen Lössbodens ermittelt und anhand von Parameterstudien der Einfluss des Ton‐ und Kalkgehalts auf das Hydrokonsolidationsverhalten untersucht.Die gewonnenen Erkenntnisse dienten als Grundlage für die Formulierung einer neuen, empirisch abgeleiteten Prognosemethode zur qualitativen Abschätzung der infolge Hydrokonsolidation zu erwartenden kollapsartigen Verformung (Kollapsverformung).Method for the empirical prediction of the collapse deformations of loess soilsResearch into the liability of loess ground to collapse was historically carried out at the level of individual nations, particularly between the 30s and 80s of the last century. Internationally linked research in the area of the identification of the characteristics of the soil mechanics of loess ground is only taking place since the beginning of the 80s with the formation of the Geotechnical Properties of Loess working group. The main effort of research work in the past has been in the derivation of so called Collapse Criteria for the qualitative estimation of collapse potential in relation to increasing water content. While geochemical examinations of loess soils carried out so far have described their mineral compositions, they have, however, only produced limited amounts of data about the water solubility of soil components and its influence on collapse liability.An initial examination of water soluble components of Afghan loess soils and of the influence of their clay and chalk contents on hydroconsolidation – on the basis of parameter studies – has been carried out at the Institute for Soil Mechanics and Geotechnical Engineering at the University of the Bundeswehr in Munich.The resultant findings served as the basis for the formulation of a new, empirically derived prognosis method for the qualitative estimation of collapse‐type deformations which can be expected as a consequence of hydroconsolidation.

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Creation of artificial loess soils

Zourmpakis

Boardman

Rogers

Springer Proceedings in Physics

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Factors and Mechanism of Loess Collapsibility

Cited by 26 publications

References 0 publications

Mechanical behavior of unsaturated compacted Iowa loess

Mechanical behavior of unsaturated compacted Iowa loess

Methode zur empirischen Prognose der Verformungen von sackungsanfälligen Lössböden

Creation of artificial loess soils

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