Liquid consistency of organic soils under the bridge construction
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DSc., Eng., Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
PhD., University of Ecology and Management, Faculty of Architecture, ul. Olszewska 12, 00-792 Warsaw, Poland
PhD., Sc., Eng. Ass. Prof., University of Zagreb, Faculty of Mining Geology and Petroleum Engineering, Pierottijeva 6, p.p. 390, 10000 Zagreb, Croatia
Submission date: 2020-10-07
Final revision date: 2021-03-02
Acceptance date: 2021-03-02
Publication date: 2021-06-24
Archives of Civil Engineering 2021;67(2):181-194
The paper presents the case study of geotechnical investigations reporting connected with expert’s opinion on undrained shear strength of organic sediments in the river valley at the north of Poland according to reinforcement methodology of c.a. 0,7 km highway embankment. Diversification of primary results caused additional research which revealed and confirmed liquid consistency of organic soils – several meters of organic and calcareous sediments – gyttja under the thin cover of peat. The main goal of the paper is a discussion on standardization of consistency of organic soils itself and additionally to point out very rare possibility of liquid consistency, finally not pointed in International Standards ISO 14688. The application of Atterberg limits in organic sediments is moot but even organic soil with water content higher than liquid limit can’t be classified and interpreted as very soft with description as soil which exudes between the fingers when squeezed in the hand. Such identification is practically impossible when it’s hard to squeeze because of gravitationally leaking through the fingers.
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