More and more civil engineering constructions are being built on soft soils. As areas with better foundations are used up the necessity to be able to build structures on soft soils increases.

The most troublesome of soft soils are organic soils due mainly to their high compressibility (much higher than in mineral soils), and also their very low shear strength. The large diversity of organic soils with respect to their origin as well as their properties make classification, testing, and engineering prediction of behaviour, very difficult. For this reason, engineers try, in general, to avoid constructing on deep layers of organic soils. If forced, by necessity, to do so, they manage with light structures e.g. embankments or low buildings.

The authors of this book have been involved in a joint research project on the testing of embankments on organic soils. This was carried out in the North-Western part of Poland by the Swedish Geotechnical Institute and the Department of Geotechnics of Warsaw Agricultural University.

The results of their research is presented in this new book and provides a valuable insight into this growing area in the field of engineering geology.

Table of Contents

Preface. Notation and symbols. Introduction (J. Hartlén, W. Wolski). I. Testing and Analysis. Organic soils (R. Larsson). Geological origin. Engineering properties. Soil classification. References. Site investigations (U. Bergdahl). General. Mapping, general survey. Soil layer sequence. Groundwater. Strength and deformation characteristics. Monitoring equipment. Test embankments for design purposes. References. Laboratory investigations (Z. Lechowicz, A. Szymanski, T. Baranski). General. Routine tests. Determination of stress history. Determination of deformation and consolidation parameters by oedometer tests. Determination of deformation parameters by triaxial test. Determination of shear strength. Determination of permeability. References. Stability analysis (Z. Lechowicz). General. Shear strength used in stability analysis. Methods of stability analysis. Stability of single-stage embankment. Stability of stage-constructed embankments. Other approaches in stability analysis. References. Analysis of subsoil deformations (A. Szymanski). General. Deformation and consolidation parameters. Analysis of "final" deformation. Consolidation analysis. Consolidation analysis of subsoil with vertical drains. Swelling analysis. Development trends in deformation and consolidation analysis. References. II: Design and Construction Methods. Methods of construction (J. Hartlén). General. Choice of method. Review of basic concepts of embankment construction on organic soils. Load adjustment (P. Carlsten). Profile lowering. Pressure berms. Lightweight fills. References. Replacement (P. Carlsten). General. Excavation and backfill. Progressive displacement. References. Staged construction (W. Wolski). General. Precompression technique. Vertical drains. Co


No. of pages:
© 1996
Elsevier Science
Electronic ISBN:
Print ISBN:

About the editors