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Local soil failure before general failure.
No full textSlopes are generally characterized by non-uniform stress field. Additional stresses induced by changes in boundary conditions can emphasize local differences in the stress level. As a consequence, every failure process is, at first, local, with formation of plastic zones, then general. This is the subject of this paper, which concerns clay slopes, whose failure generally implies formation of a shear zone. A special consideration is addressed to the simple and special case of infinite slope which is also featured by transition from local to general failure, even if stress conditions are uniform along the potential failure plane
Some aspects of the mechanical behaviour of "structured" soils and soft rocks .
No full textSoft rocks and many soils all over the world are "structured" due to presence of weak bonds between individual particles. In this paper some examples re-garding the role of bonding on both deformability and strength are reported. Considering the common aspects which associate these materials, an unified framework is proposed
Local soil failure before general failure.
No full textSlopes are generally characterized by non-uniform stress field. Additional stresses induced by changes in boundary conditions can emphasize local differences in the stress level. As a consequence, every failure process is, at first, local, with formation of plastic zones, then general. This is the subject of this paper, which concerns clay slopes, whose failure generally implies formation of a shear zone. A special consideration is addressed to the simple and special case of infinite slope which is also featured by transition from local to general failure, even if stress conditions are uniform along the potential failure plane
Varnes classification of landslide types, an update
No full textThe goal of this article is to revise several aspects of the well-known classification of landslides, developed by D.J. Varnes (1978). The primary recommendation is to modify the definition of landslide-forming materials, in order to provide compatibility with accepted geotechnical and geological terminology of rocks and soils. Other, less important modifications of the classification system are suggested, resulting from recent developments of the landslide science. The modified Varnes Classification of landslides has 32 landslide types, each of which is backed by a formal definition. The definitions should facilitate backward compatibility of the system as well as possible translation to other languages. Complex landslides are not included as a separate type category, but composite types can be constructed by the user of the classification by combining two or more type names, if advan-tageous
Some considerations on the role of geological history on slope stability and the estimation of the minimum apparent cohesion of a rock mass
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