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Collapsing engineering soils are a formidable hazard around the world. These difficult materials also include some of the world's most fertile agricultural soils, fostering dense human populations which are therefore increasingly at risk. Despite an impressive literature on the engineering aspects of collapsing soils, these materials are coming under increasing scrutiny by scientists in other fields. This is most evidently the case with soil scientists, stratigraphers and sedimentologists. Past earth surface conditions have a direct influence on the detailed behaviour of collapsible soils: as a complement, these materials also provide detailed data on changing global climates. The selected papers presented here highlight the common ground between three scientific groups with a vested interest in a better understanding of collapsible soils.
Sommario
Types and Distribution of Collapsible Soils.- Six Definable Particle Types in Engineering Soils and Their Participation in Collapse Events: Proposals and Discussions.- A Stress Path Model for Collapsible Loess.- Factors and Mechanism of Loess Collapsibility.- Techniques to Examine Microfabric and Particle Interaction of Collapsible Soils.- On the Development of Microstructure in Collapsible Soils.- The Slovak Carpathians Loess Sediments, Their Fabric and Properties.- Mechanisms of Collapse of Soil Structure.- The Collapse Mechanism of a Soil Subjected to One-Dimensional Loading and Wetting.- The Influence of the Clay Component in Loess on Collapse of the Soil Structure.- Interpretation and Comparison of Collapse Measurement Techniques.- Consideration of the Possible Contributions of Amorphous Phases to the Sensitivity of Glaciomarine Clays.- Variation in Collapsibility and Strength of Loess with Age.- Collapsible Loess on the Loess Plateau of China.- Post-Depositional Processes in High-Sensitivity, Fine-Grained, Collapsible Sediments.- Changes in Water Chemistry and Loess Porosity with Leaching: Implications for Collapsibility in the Loess of North China.- Effects of Rock Fragments on the Structural Collapse of Tilled Topsoils During Rain.- Simulation and Modelling of Collapsible Soils.- Collapse Mechanisms and Design Considerations for Some Partly Saturated and Saturated Soils.- Design and Treatment of Loess Bases in Bulgaria.- Comparison of Results of Oedometer and Plate Load Tests Performed on Collapsible Soils.- Post-script.
