Abstract Dynamic disasters frequently occur in deep coal mines, where coals and rocks are under high situ stresses. To reveal the failure mechanism of burying coals, specimens were made buried at a depth about 1 km. An improved Kolsky bar was applied to conduct dynamic compression experiments subjected different hydrostatic pressure i.e., 0, 5, 10, 15, 20 MPa for simulating stresses correspondi...

A central point of validity computer X-ray diffraction micro tomography is to improve the digital contrast and spatial resolution 3D-recovered nano-scaled objects in crystals. In this respect, denoising issue 2D image patterns data involved 3D high-resolution recovery processing has been treated. The Poisson-noise simulation was performed; afterwards, it employed for recovering crystal structur...

In this paper, using Monte Carlo Fortran code, we have obtained the binding energies for three different systems of diquark–antidiquark in distances from 0.01 to 15 nm. In [0.1 - 15] nm interval, we made use of Coulomb potential because in this interval, strong interaction is negligible. We have compared the binding energies of the systems with one another. The results of these comparisons...

Stone columns are a more economical and efficient method to enhance the strength of expansive soils. Using granular blanket over top ordinary stone (OSC) improves drainage distribution applied stress impending from superstructure. The present study studied effect geogrid layers in (GB) OSC numerically using 'PLAXIS 2D'. 'Mohr-Coulomb failure criterion was deliberated for column, blanket, soil, ...

We study flows on the scalar manifold of N = 8 gauged supergravity in five dimensions which are dual to certain mass deformations of N = 4 super Yang–Mills theory. In particular, we consider a perturbation of the gauge theory by a mass term for the ad-joint hyper-multiplet, giving rise to an N = 2 theory. The exact solution of the 5-dim gauged supergravity equations of motion is found and the m...

Triaxial experiments show that samples of fault gouge deform distinctly differently than those from the adjacent fault damage zone (e.g., Chester and Logan, 1986). Rock samples in the damage zone follow a characteristic elastic-brittle behavior, whereas fault gouge readily compacts and deforms in a more ductile manner. In order to explain the apparent weakness of large plate bounding faults suc...

A new formulation as well as a new solution technique is proposed for an equilibrium path-following method in two-dimensional quasi-static frictional contact problems. We consider the classical Coulomb friction law as well as geometrical nonlinearity explicitly. Based on a criterion of maximum dissipation of energy, we propose a formulation as a mathematical program with complementarity constra...

The effective phase change from fluid behaviour to solid behaviour, that too often occurs in granular flow and brings with it such unwelcome events as funnel flows in hoppers and clogging of other material handling devices, is studied using a discrete particle computer simulation of a Couette flow with gravity. This simulation exhibits the full range of granular flow behaviour, from a stagnant ...

Displacement finite element analysis is performed for a cone-penetration test in cohesionless soils. By modelling finite strain in the soil and large scale sliding at the penetrometer–soil interface, a more realistic penetration process is simulated in which the penetrometer is assumed to be rigid and the soil is assumed to be an elastic-perfect-plastic continuum obeying the Mohr–Coulomb criter...