Tectonic stresses impact on rock mass structure and properties

Couple stresses and the fracture of rock.

An assessment is made here of the role played by the micropolar continuum theory on the cracked Brazilian disc test used for determining rock fracture toughness. By analytically solving the corresponding mixed boundary-value problems and employing singular-perturbation arguments, we provide closed-form expressions for the energy release rate and the corresponding stress-intensity factors for bo...

Hypervelocity Impact on Rock

Concerted research efforts are being made to find new means of rock disintegration for more rapid, efficient excavation. Water jets, metallic jets and hypervelocity projectiles have been found to cut or break rock with varying degrees of efficiency depending upon several parameters, which are being defined by research in Russia, Britain and the United States. Optimum performance of high velocit...

evaluation of rock mass deformability

One of the most important effective parameters in design of engineering structures is deformability of rock mass. Benchmark of rock mass deformability is the deformation modulus that directly or indirectly obtained. Since the determination of rock mass deformation modulus indirect method by in-situ tests is time-consuming, costly and difficult from executive operations aspect, so it’s correctly...

New impact-melt rock from the Roter Kamm impact structure, Namibia: Further constraints on impact age, melt rock chemistry, and projectile composition

available online at http://meteoritics.org New impact-melt rock from the Roter Kamm impact structure, Namibia: Further constraints on impact age, melt rock chemistry, and projectile composition Lutz HECHT1*, W. Uwe REIMOLD1, Sarah SHERLOCK2, Roald TAGLE1, Christian KOEBERL3, and Ralf-Thomas SCHMITT1 1Museum for Natural History, Humboldt University, Invalidenstrasse 43, 10115 Berlin, Germany 2De...

Tectonic Processes on Europa: Tidal Stresses, Mechanical Response, and Visible Features