Vertical and horizontal permeability measurements in organic soils

• Autorzy: Malinowska E.E. , Szymanski A.

Warianty tytułu

PL

Pionowe i poziome pomiary przepuszczalności w gruntach organicznych

• Języki publikacji: EN

Abstrakty

EN

The paper is referring to vertical and horizontal laboratory permeability measurements in soft organic soils. The estimation of anisotropic permeability in soft organic soils, as peats, requires to use a special apparatus and the knowledge of proper analysis of the test results. During loading the void ratio decreases substantially that causes the changeability of the permeability. The change of permeability during the compression is very important because of the infl uence of the consolidation coefficient. Initial strain in soft organic soils appears very quickly, just after loading, and brings immediately the decrease of permeability. In most of the estimations, it is assumed that during the consolidation process the water flows just in the vertical direction. In soft organic soils, like peats, the consolidation theory should consider the changes of mechanical and physical properties in consolidation period, in both directions. The direct measurement of vertical and horizontal permeability of organic soil and the non-Darcian flow theory may be of considerable importance in estimating pore water pressure dissipation, and settlement rates in the consolidation model. In the paper, the method of investigation and the test results of the vertical and horizontal permeability are presented. The Modifi ed Rowe Cell Set for obtaining consolidation and fl ow characteristics in different directions is used.

PL

W artykule została przedstawiona metodyka pomiaru przepuszczalności w kierunkach pionowym i poziomym. Ocena anizotropii przepuszczalności, szczególnie w słabonośnych gruntach organicznych, wymaga zastosowania specjalistycznego sprzętu i właściwej analizy otrzymanych wyników. Podczas obciążania podłoża organicznego nasypem budowlanym zmniejsza się wskaźnik porowatości, co powoduje zmianę przepuszczalności gruntu. Owa zmiana przepuszczalności znacząco wpływa na przebieg procesu konsolidacji. W opisie modelu deformacji organicznego podłoża słabonośnego należy brać pod uwagę zarówno nieliniowość zależności naprężenie– odkształcenie, jak nieliniowość i anizotropię przepływu. W celu uzyskania parametrów przepływu w kierunkach pionowym i poziomym została zastosowana metoda zmodyfi kowanego zestawu komory Rowe’a (MRCS).

Słowa kluczowe

EN

organic soil; permeability; soil permeability; flow characteristics; peat soil

• Wydawca: -
• Czasopismo: Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
• Rocznik: 2015
• Tom: 47
• Numer: 2
• Opis fizyczny: p.153-161,fig.,ref.

Twórcy

autor

Malinowska E.E.

• Laboratory of Water Centre, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences – SGGW, Ciszewskiego 6, 02-776 Warsaw, Poland

autor

Szymanski A.

• Laboratory of Water Centre, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences – SGGW, Ciszewskiego 6, 02-776 Warsaw, Poland

Bibliografia

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Identyfikatory

DOI

10.1515/sggw-2015-0021