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Concept

Basalt

Related publications (29)

A new model for TBM performance prediction in blocky rock conditions

Jian Zhao, Andrea Delisio

The term "blocky rock conditions" is generally associated with face instabilities in blocky/jointed rock masses. These events are generally promoted by unfavorable rock mass structural conditions, in terms of joint frequency and orientation, and acting str ...

Pergamon-Elsevier Science Ltd2014

Review of the TBM performance in blocky rocks with potential face stability issues

Jian Zhao, Andrea Delisio

In blocky/jointed rock masses, the combined effects of the rock mass structure and the in-situ state of stress may lead to severe instabilities of the excavation face which may become "blocky". Large breakout and rock block detachment from the tunnel face ...

Crc Press-Taylor & Francis Group2013

Analysis and prediction of TBM performance in blocky rock conditions at the Lotschberg Base Tunnel

Jian Zhao, Andrea Delisio

This paper focuses on the analysis of the TBM performance recorded during the excavation of the Lotschberg Base Tunnel. The southern part of the tunnel was excavated by two gripper TBMs, partly through blocky rock masses at great depth. The jointed nature ...

Elsevier2013

The structure of the asteroid 4 Vesta as revealed by models of planet-scale collisions

Philippe Gillet

Asteroid 4 Vesta seems to be a major intact protoplanet, with a surface composition similar to that of the HED (howardite-eucrite-diogenite) meteorites(1-4). The southern hemisphere is dominated by a giant impact scar(5), but previous impact models(6-8) ha ...

Nature Publishing Group2013

Superhard transparent hybrid nanocomposites for high fidelity UV-nanoimprint lithography

Jan-Anders Edvin Maansson, Yves Leterrier, Marina Aymara González Lazo, Maïté Blank

Transparent hyperbranched acrylate nanocomposites were produced using different combinations of silica nanoparticles and silicon-based sol-gel precursors. The nanocomposites were processed using a dual-cure UV polymerization and condensation scheme. The vi ...

2013

Shock-induced deformation of Shergottites: Shock-pressures and perturbations of magmatic ages on Mars

Philippe Gillet, Pierre Beck

Shergottites and Chassignites practiced major deformation effects whose nature, magnitude and relevance were controversially evaluated and disputatively debated. Our studies of many shocked shergottites present, contrary to numerous previous reports, ample ...

Pergamon-Elsevier Science Ltd2013

A four-dimensional X-ray tomographic microscopy study of bubble growth in basaltic foam

Understanding the influence of bubble foams on magma permeability and strength is critical to investigations of volcanic eruption mechanisms. Increasing foam porosity decreases strength, enhancing the probability of an eruption. However, higher porosities ...

Nature Publishing Group2012

Development and Application of Devices for Online Trace Element Analysis of Thermal Process Gases from Woody Feedstocks

Marco Wellinger

When using natural or waste wood in thermo-chemical conversion processes, the presence of a number of heteroatoms (e.g. sulfur, chlorine, potassium and sodium or heavy metals) may hinder the processes themselves as well as pose a threat to equipment and/or ...

EPFL2012

The influence of sodium and potassium hydroxide on volume changes in cementitious materials

Karen Scrivener, Aditya Kumar

This research investigates the influence of alkali hydroxides on unrestrained volume changes. A detailed multi-method approach is used to characterize the progress of cement hydration, autogenous and drying volume changes (i.e., shrinkage), autogenous RH d ...

Pergamon-Elsevier Science Ltd2012