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Występowanie agregatów w gruntach spoistych i ich wpływ na ocenę niektórych właściwości tych gruntów

Myślińska E.

Przegląd Geologiczny

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2004

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Vol. 52, nr 8/1

653-–656

EN

The paper presents problems linked with the presence of aggregates in cohesive mineral and organic soils. Aggregates are present in almost all of these soil types. They result from the cooperation of clay particles, soil crystallization, cooperation between clay particles and organic matter as well as such factors as soil loading or drying. Aggregates are to a variable degree resistant to external factors. Most resistant are organic-mineral aggregates, particulary after drying. The presence of aggregates decreases the degree of soil dispersion, and thus their total surface and hydrophility. At the same time the porosity and permeability of aggregate soils increases in comparison to more dispersive soils. Examples of changes in the activity value (coefficient A) for soils are presented according to the results of microaggregate analysis, that is presence of aggregates, in relation to the coefficient calculated with the use of results of granulometric analysis determining the primary granulometric content. In order to evaluate correctly the different parameters determined basing on the correlation with the clay fraction content, a granulometric analysis of the primary clay fraction content as well as microaggregate analysis should be carried out.

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Classification of organic soils for engineering geology

Myślińska E.

Geological Quarterly

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2003

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Vol. 47, No 1

39-42

EN

This paper reviews the classifications of organic soils as applied in different countries, with particular attention drawn to those based on international and European norms. These norms propose the distinction of four groups of organic soils: peats (fibrous, pseudo-fibrous, and amorphous), gyttja and humic soils, which may be further divided into sub-groups. Organic soils are included within poor soils, because of their considerable susceptibility in relation to water, which causes their high compressibility, low strength and high shrinkage. Existing regional and international norms and plans appear not to characterise these soils sufficiently. The classification proposed in this paper will allow determination of the relationships between particular engineering geological parameters, which, to a large degree, will help planning of such objects as embankments or melioration structures. This is, however, possible only within particular genetic types. Organic soils developed in different conditions differ not only in organic matter content, but also in their chemical and physico-chemical character (i.e. degree of carbonisation, relation of humic acids to fulvic acids, bitumen content, degree of coagulation and decomposition of organicmatter). The evaluation of organic soils requires firstly the determination of their origin, and then each genetic group should be subdivided based on the content of organic matter. The relationships between the physical, physico-chemical and mechanical properties should be then determined within these groups.

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Parametry fizyczne torfów i ocena metod ich oznaczania

Myślińska E.

Przegląd Geologiczny

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1999

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Vol. 47, nr 7

676-682

PL

Torfy należą do gruntów organicznych zawierających znaczną ilość substancji organicznej o bardzo zróżnicowanych właściwościach. Powoduje to konieczność stosowania (w większości przypadków) odmiennych metod badania ich właściwosci fizycznych, często bardziej skomplikowanych, niż w badaniu gruntów mineralnych. Wartości parametrów fizycznych torfów w znacznym stopniu odbiegają od wartości charakterystycznych dla takich samych parametrów gruntów mineralnych, nawet zawierających wysoko aktywną frakcję iłową. Istnieje możliwość oceny zastosowania tych wzorów dla gruntów z obszaru Polski. Z badań wynika także zależność między różnymi właściwościami torfów.