Results 181 to 190 of about 20,254 (256)
Structural features and mechanical behaviour of a pyroclastic weak rock
International Journal for Numerical and Analytical Methods in Geomechanics, 2001 AbstractThe results of an extensive programme of laboratory testing on intact and reconstituted samples of a pyroclastic weak rock from the volcanic complex of the Colli Albani (Central Italy) are presented. The deposit is known asPozzolana Neraand may be assimilated to a bonded coarse grained material.
Manuela Cecconi, Giulia M. B. Viggiani
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Cyclic and dynamic behaviour of a soft pyroclastic rock
Géotechnique, 2015 The mechanical behaviour under cyclic and dynamic conditions of a weakly cemented pozzolana, taken from the subsoil of a historical town in a seismically active area, was investigated through laboratory tests and in situ measurements. The geotechnical characterisation at laboratory scale is of particular importance as the small- and large-scale ...
Luca Verrucci +3 more
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Mechanical properties of a weak pyroclastic rock and their relationship with microstructure
Canadian Geotechnical Journal, 2014 The geotechnical behaviour of very weak pyroclastic rocks controls both the failure mechanisms at the margins of rock mesas, where historic hill towns are often sited, as well as the stability of old underground cavities in urban areas of Central Italy.
Paolo Tommasi, Luca Verrucci, T. Rotonda
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The Ground Surge Deposit: a Third Type of Pyroclastic Rock [PDF]
Nature Physical Science, 1973 PYROCLASTIC rocks are defined as fragmental volcanic products in which the fragmentation of lava or rock and the ejection of the fragments from the vent are both due to explosive volcanic activity. Pyroclastic rocks have long been subdivided into two broad types, pyroclastic fall deposits and pyroclastic flows.
R. S. J. Sparks, George P. L. Walker
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The stochastic assessment of strength and deformability characteristics for a pyroclastic rock mass
International Journal of Rock Mechanics and Mining Sciences, 2008 Abstract A practical procedure is described for implementing probabilistic determination of rock mass strength and deformability properties of a pyroclastic rock medium. In order to carry out this procedure, the discontinuity properties of rock mass are collected in the field and laboratory studies are conducted on the intact rock samples.
Mehmet Sarı
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Monitoring a deep excavation in pyroclastic soil and soft rock
Tunnelling and Underground Space Technology, 2021Abstract The completion of the downtown stretch of Line 1 of the Napoli (Italy) underground involved the construction of a number of stations in the historic centre of the city, including the Universita station. This station consists of two shafts excavated with the protection of reinforced concrete diaphragms, and two platform tunnels.
Nicotera, Marco Valerio +1 more
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Factors governing the formation of pyroclastic rocks
Bulletin Volcanologique, 1970The basic condition governing the formation of pyroclastic rocks is the relationship between the disruptive force of gas pressure in bubbles to the strength of the liquid for short term stresses and surface tension. The latter factor controls the coalescence of bubbles, because it is strongly dependent on the composition, temperature, and water content
A. R. McBirney, T. Murase
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Stratigraphic Problems of Pyroclastic Rocks
1984Stratigraphic methods used to study volcanic rocks are similar to those used to study sedimentary rocks and have similar purposes: establishing correlations, vertical time sequences, determining facies changes and the like. Additional aid in pyroclastic stratigraphy comes from igneous petrology, studies of magma evolution, and studies of the growth ...
Hans-Ulrich Schmincke, Richard V. Fisher
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