1,722,228 research outputs found
Investigation results for the improvement design of the foundation rocks of the Amendolea Castle (Condofuri, Reggio Calabria, Italy)
No full textThe Amendolea Castle is in extreme degradation conditions
set up to slip and to lateral spreading due to different factors such
as the intense fracturing of crystalline metamorphic bedrock, the
lack of interlocking foundations, the degradation of the walls, the
imperfect forming of walls portions. The paper focuses on the
results of the geomechanical survey and in situ investigations
(geophysical prospecting and GPR, etc.) that allowed to classify
the rock mass of the Amendolea Castle foundation as a class III
rock mass according to the Bieniawski classification (Rock Mass
Rating RMR, 1989). On the base of the obtained investigations
results, the designing of the support systems of foundation rocks
of the castle has been performed. The design involved works to
bound the danger coming from narrow detachments and falls,
such as steel nets with 5 m deep nails, and works to prevent the
sliding along the inner rock mass, such as 12 m anchors
Qualitative Landslide Susceptibility Assessment in Small Areas
No full textAbstractThe paper shows the application of heuristic methods to assess qualitatively the landslides susceptibility of an area located at the end of the flowslides path. Numerical analyses have been performed to study the flowslide propagation phase and landslides susceptibility maps of the studied area have been obtained. Focusing the attention on a zone located at the end of the flowslides path, qualitative susceptibility analyses have been applied using two heuristic methods. The comparison of obtained results highlighted how heuristic methods strongly depend on the judgement of the person carrying out the analysis
Changes in natural clay microstructure due to laboratory weathering
No full textPart of the research to characterize the soils involved in shallow landslides is described in the paper. The studied landslides were the slide-flows occurred in September 2000 in the Jonian side of Calabria (Italy). In particular, the results of micro-structural investigations performed on natural clay specimens taken from samples near detachment zones are shown. The comparison of the results between the investigation on intact and artificially weathered specimens showed the wide micro-structural changes due to weathering cycle
Geomechanical Characterization of the Rock Mass along a Deep Vertical Borehole
No full textDeep vertical boreholes play a crucial role in underground exploration, resource extraction such as geothermal energy extraction, oil and gas exploration, underground waste storage and various underground engineering applications. The geomechanical properties of the rocks surrounding these boreholes are essential for designing safe, efficient drilling operations, for using adequate technologies and equipment and for providing mitigation measurements. Specifically, when the excavations are performed inside in-depth, extremely fractured and weathered rocks, the identification of zones more susceptible to crossing is a primary goal. This paper presents a thorough investigation into the rock masses surrounding a deep vertical borehole that involved the collection of core samples from the deep vertical borehole, laboratory testing, in situ tests and the application of geomechanical models to characterize the crossed rock masses. After a lithological and structural description of the rock masses and a description of the methodology used for their characterization, this paper focuses on the geomechanical parameterization of the rock mass using the uniaxial compressive strength of the intact rock (σci) and the Geological Strength Index (GSI). The obtained findings highlight the extreme variability in the depth of the geomechanical parameters of crossed rocks, which decreased with the depth. This methodology can be used to characterize rock masses along other deep boreholes, for which there is a lack of research, and to define the most problematic zones for underground crossing where different support works must be designed
The design of geotextile filters for granular soils
No full textThe use of geotextile filters is very common in geotechnical and in environmental engineering. In these structures the flow conditions (steady and unsteady flow, parallel or normal flow to filter, high or low hydraulic gradients) and the boundary conditions (vertical effective stresses, continuity of contact between the filter and the base soil) can be very different. In all applications the functions of filter are to prevent the movement of fine particles of base soil and to avoid the development of excessive pore water pressure on interface between base soil and filter. The main filter functions are retaining the base soil: pore size distribution and filtration opening size must be lower than fixed limits (retention criterion); being more permeable than base soil: pore size distribution and filtration opening size must be higher than fixed limits (permeability criterion). The available design criteria are often the result of theoretical and experimental analyses carried out in laboratory under experimental conditions different respect to the field conditions. Moreover, the design criteria do not consider the different flow conditions and the boundary conditions. In this paper, on the base of the current knowledge and trends in geotextile filter design and research a new procedure for the design of geotextile filter is show
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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