130,473 research outputs found
Incidenza dei fattori naturali ed antropici sull'evoluzione dell'alveo del T. Tidone (Appennino Piacentino)
No full textRelationship between the residual shear strength and the methylene blue value in weathered clay soils
No full textA new correlation is proposed between the residual shear strength and the methylene blue value (‘value of blue’; VB) for
weathered clay soils on argillaceous bedrock and on alluvial soils in the Oltrepo Pavese area (Northern Italy), which can be
considered as geologically representative of a large part of the Italian Apennines. Shallow landslides occur periodically in these
soils as a result of high-intensity rainfall events. A number of soils were tested. Trench pits were used for sampling and for the soil
profile description (lithology, structure, grade of weathering, thickness). Field surveys were integrated with some standard
geotechnical laboratory tests. The methylene blue dye adsorption (VB) was determined in accordance with the French AFNOR
standards. The residual strength friction angle was measured with direct shear tests; the procedure employed for the measure
involved inserting the soil at the liquid limit in the direct shear ring, applying consolidation in stages and then shearing (Kanji
method). The applicability of some existing correlations between the residual friction angle and index properties were tested.
The correlations are characterized by a large amount of scatter in the data and tend to overestimate the residual friction angle.
The VB test is easy and rapid to perform and appears to be a good indicator of the residual strength friction angle for the tested soils
Evaluating liquefaction potential of soils using CPT: a case study in the central Po River Plain, Italy
No full textSwelling/shrinkage hazard prevention using thematic maps: some examples in the French area.
No full textProblematiche geologico-tecniche connesse al recupero ambientale di cave cessate: l’esempio della Provincia di Pavia
No full textAPPLICABILITA' DI PROVE PENETROMETRICHE STATICHE NELLA RICOSTRUZIONE DEL PROFILO STRATIGRAFICO
No full textSummary
The present paper mainly deals with the stability of debris deposits in the northern Apennines, which is an area of relatively
high seismicity. More specifically, the paper analyses the co-seismic stability of dry infinite slopes by the Limit Equilibrium
Method (LEM) and uses the results of Newmark-type analysis for defining appropriate values of the seismic coefficients
to be used in pseudo-static analysis.
The study areas are the mountainous zones of Garfagnana and Lunigiana (Tuscany – Italy), which consist of hundreds of
square kilometres.
The main purposes of the paper are: to outline a methodological approach, to define criteria for assessing the stability conditions
in the whole study area and to suggest appropriate seismic coefficients for slope instabilities mainly driven by inertial
forces (to be used in LEM analyses)
Appendix A reports information on the strength parameters of debris deposits as obtained from a number of works. Mainly
Appendix A gives a range of possible values. In fact, these values have not been used in the present study, because the objective
of the study is to define general criteria for stability conditions and not to analyse specific case studies.
Appendix B shows plots of the yield -acceleration values that have been obtained from pseudo-static analysis assuming homogeneous
soil profile with c’ and φ’, curvilinear failure surface and different water table. This Appendix has the only purpose
of extending the possible application of the proposed methodology
Comparison between different approaches of modeling shallow landslide susceptibility: a case history in the area of Oltrepo Pavese, Northern Italy
No full text
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