It is shown that the discrete energies of a scattering Hamiltonian calculated under the influence of an artificial confining potential can be used to determine its phase shifts. Two potentials that have the same energy under the influence of the confining potential have exactly the same phase shift at that energy when the confining potential is removed. Thus the phase shifts of a complicated ma...

We introduce an exponentially confining potential well that can be used as a model to describe the structure of strongly localized system. obtain approximate partial solution Schrödinger equation with this where we find lowest energy spectrum and corresponding wavefunctions. use tridiagonal representation approach method for obtaining finite series square-integrable functions written in terms B...

Many petrophysical properties (e.g. permeability, electrical resistivity etc.) of tight rocks are very stress sensitive. However, most mercury injection measurements are made using an instrument that does not apply a confining pressure to the samples. Here we further explore the implications of the use and analysis of data from mercury injection porosimetry or mercury capillary pressure measure...

Abstract Stress controlled cyclic triaxial tests have been carried out on coastal sand of Digha, West Bengal, India at different frequencies, confining pressures, relative densities and number loading cycles for determination influence these parameters strength (expressed in terms stress ratio) initial liquefaction Digha sand. The test results provide evidence that increasing density increases ...

To provide technical support for gas extraction and accident prevention technology, the permeability law of in coal seams under different ground stress pressure has been explored. The evolution sample confining was deeply studied by using rock mechanics–permeability test system TAWD-2000. conclusions are as follows. samples can be divided into three stages whole stress–strain process, gradually...

Strength of rocks in the confined tension region, where minimum principal stress is tensile, has only infrequently been measured and not well understood. Quasi-static Brazilian tests under a range confining stresses (2.76 to 27.58 MPa) used determine strength sandstone region. The test results indicate that region was strong function intermediate stress: increasing significantly increased sands...

Abstract Study of mechanical properties rock under hydro-mechanical coupling. The MTS815 mechanics system is used to perform triaxial compression tests water-saturated sandstones different confining pressures and pore water pressures. results show that the peak deviation stress its corresponding axial strain, residual stress, initial dilation deformation modulus sandstone are related pressure p...

Particle crushing dominates the deformation behaviour of granular materials under significantly high compressive and shear stress. A proposed constitutive model has been verified to predict crushing behaviour of granular materials with different crushability and adopted one kind of reference crushing stress. It is noted that no positive dilatancy of granular material in triaxial test occurs onc...