Construction of structures on soft organic soils gives rise to special problems. The most obvious ones are large deformations that may occur during and after the construction period, both vertically and horizontally. The settlements often appear quickly but may also continue for very long time periods due to secondary compression. In this paper the results of laboratory tests of peat and calcareous soil samples to define deformation characteristics are presented. Laboratory tests were com prised of oedometer and triaxial tests. Deformation characteristics obtained in laboratory tests were used for determination of variability in deformation modulus describing the deformation process in soft soils. The results of laboratory tests perform ed for organic soils indicate the different character of variation in parameters values which depends on effective stress components. It is important to know that the rate of strain can inereasing or decreasing during the creep phase. It depends on level of deviatoric stress. In final effect the inereasing of rate can lead to soil failure.
Spośród metod budowy nasypów na gruntach słabych rozpatrzono zastosowanie metody budowy z zastosowaniem przeciążenia podłoża. W przypadku tej metody uzyskuje się przyspieszenie konsolidacji podłoża i możliwość osiągnięcia osiadań docelowych w stosunkowo krótkim czasie. Omówiono wyniki własnych badań doświadczalnych.
EN
During the construction of embankments on organic soils the choice of foundation method is a matter of finding the optimum solution. Economic and technical aspects must be considered. When dealing with stability and settlement problems there are the several options to choose from, such as: load adjustment, soil replacement and soil improvement. This paper presents the results of field and laboratory investigations performed on organic soils in order to explain the possibility to applied surcharging to compensate for secondary compression in soil improvement method.
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