124,583 research outputs found
Evaluation of the degree of compaction of levees by a CPT- based method
No full textPermeability and strength parameters of compacted soils may be correlated to their degree of compaction. Unfortunately, the use of conventional and recent testing methods for the assessment of density and water content of earthworks under construction cannot be applied to existing levees. Therefore, the development of an expeditious and accurate method for the assessment of the degree of compaction of existing and new levees, after their completion, appears extremely useful. The purpose of this research is to develop a simple tool for the assessment of the degree of compaction of “compacted”, partially saturated, fine grained soils. The proposed method combines in situ testing like electric CPT or CPTu with laboratory penetration testing performed with a mini–cone in a calibration chamber
Evaluating degree of compaction of levees using cone penetration testing
No full textPermeability and strength parameters of compacted soils (i.e., levees as well as other earthworks) may be correlated to the degree of compaction. Since the use of conventional and recent testing methods for the assessment of density and water content of earthworks, under construction, cannot be applied to existing levees, an expeditious and accurate method for the assessment of the degree of compaction of existing and new levees, after their completion, appears extremely useful. The purpose of this research is to develop a simple tool for the assessment of the degree of compaction of "compacted", partially saturated, fine grained soils. This paper illustrates the proposed method which combines in situ testing such as electric CPT or CPTu with laboratory penetration testing performed with a mini-cone in a calibration chamber (CC). © 2018, Taiwan Geotechnical Society
An innovative method to evaluate degree of compaction of river embankments
No full textThe paper illustrates an innovative method to evaluate the degree of compaction of
both existing and new river embankments after their completion. A tip resistance
target - profile is inferred from laboratory tests in a mini calibration chamber (CC)
using a mini CPT (cone penetration test). The “laboratory” tip resistance (qcLAB) is
expressed as a function of the expected density and of the vertical – horizontal
stress components. Such a dependence of qcLAB is obtained carrying out a number
of repeated tests in the CC at given density and different consolidation stresses. In
situ stresses are inferred by combining DMT (Marchetti Dilatomer) results and an
estimate of the vertical stress component. A comparison between the qcLAB profile,
from CC testing, and the qc, as inferred from in situ CPT, gives the possibility of
assessing the density of existing embankments, while, for new embankments, the
method defines the expected in situ qc for a given target density
Adeguamento degli argini del Fiumer Serchio: Aspetti Geotecnici
No full textall’epoca, dei quali non si hanno sufficienti conoscenze. Essi sono stati oggetto di numerose rotte, di cui l’ultima
avvenuta in più sezioni nel dicembre del 2009. Dopo quest’ultimo evento le Autorità competenti hanno realizzato una
campagna di indagini geotecniche allo scopo di incrementare il livello di conoscenza sulle strutture arginali.
L’articolo si propone di discutere i criteri per la progettazione di una campagna di indagine che sia efficiente sotto il
profilo economico, considerato che la lunghezza complessiva degli argini è superiore ai 30 km ed il livello di dettaglio
richiesto deve garantire un livello di conoscenza alla scala della singola sezione. Il cedimento dell’arginatura in un
breve tratto, infatti, provoca l’allagamento di aree molto ampie e aumenta la fragilità del sistema di protezione. La
campagna di indagini effettuata comprende sondaggi geotecnici, CPTu, prove di permeabilità, tomografie elettriche
bidimensionali e l’uso di un campionatore stratigrafico autoinguainante, oltre a prove di laboratorio sui campioni
prelevati.
La disponibilità di dati ha consentito di verificare l’efficacia dei metodi indiretti (CPTu, tomografie elettriche) per la
definizione del profilo stratigrafico. Sotto questo aspetto si è potuto confermare che le prove CPTu sono uno strumento
molto efficace ed efficiente se l’interpretazione è opportunamente guidata e calibrata attraverso i sondaggi geognostici.
D’altra parte le tomografie geoelettriche consentono di individuare la presenza di anomalie o eterogeneità nelle sezioni
arginali. Si sottolinea che nel caso specifico non è stato possibile estendere il campo delle tecniche utilizzabili a causa
delle ridotte dimensioni degli argini.
A valle della caratterizzazione geotecnica sono state eseguite alcune analisi allo scopo di chiarire le cause delle rotte del
2009, indirizzare la progettazione delle misure di rinforzo dei tratti coinvolti dalle rotte e individuare i tratti
maggiormente a rischio di cedimento in modo da fornire all’Amministrazione uno strumento per indirizzare e dare
priorità agli interventi
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Importance of full scale tests for the design of levees
No full textThis paper illustrates a case history, based on full-scale tests (trial embankment). More specifically, the settlements of a full-scale trial embankment on a very compressible soil (organic clay) for a period of 5 years are reported. The observed settlements are compared with those obtained from an A type prediction, as well as a B type prediction. The analysis results suggest the importance of an appropriate modelling of secondary settlements of organic soils. The difficulties in obtaining good quality undisturbed samples of organic clay and the peculiar creep behaviour point out the importance of full-scale tests
MODELLI FISICI E ANALISI NUMERICHE PER LO STUDIO DEL MOTO DI FILTRAZIONE IN UN ARGINE SPERIMENTALE
No full textDispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
RIUTILIZZO DELLA FRAZIONE FINE PROVENIENTE DALLE LAVORAZIONI DI UNA CAVA DI CALCARE PER LA REALIZZAZIONE DI UN ARGINE RESISTENTE ALL’AZIONE EROSIVA
No full textPragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
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