The upscaling process of mass transport with chemical reaction in porous media is carried out using the method of volume averaging under diffusive and dispersive conditions. We study cases in which the (first-order) reaction takes place in the fluid phase that saturates the porous medium or when the reaction occurs at the solid-fluid interface. The upscaling effort leads to average transport eq...

This paper reports the analysis of methods for estimating technical condition subgrade underneath a constructed railroad track or road during its operation. The study results have proven that issue related to monitoring and controlling high-quality compaction heterogeneous remains relevant requires construction reliable experimental assessing degree compaction. A procedure determining in labora...

In order to study the creep characteristics of frozen soil under different confining pressures, triaxial tests temperatures are carried out and deformation law pressures freezing is analyzed. this paper, unsteady Abel dashpot constructed by viscosity coefficient. On basis, fractional unsteady. Then, a time-dependent constitutive model for based on established. The can better describe accelerate...

Abstract In order to maintain the long-term dynamic stability of gravel soil subgrade under traffic loading and prevent fatigue damage, it is necessary determine strength different working conditions. The triaxial test was carried out on 40 groups remolded samples chosen 8 Based results test, εp-N curves εp-lgN were drawn. Further, σd-lgNf drawn, finally, computation model established. effects ...

Ecological bags have been gradually adopted for ecological protection on the subgrade slope because of their good soil fixation effect, strong water retention performance, fast construction and other advantages. made natural jute obvious attributes in environmental economic efficiency. In this study, tensile tearing strength common-used cloth tested. The result shows that meet requirements stan...

The instability of railway tracks including mud pumping, ballast degradation, and differential settlement on weak subgrade soils occurs due to cyclic stress from heavy haul trains. Although geotextiles are currently being used as a separator in highway embankments, their ability prevent the migration fine particles reduce pore pressure has be investigated under adverse hydraulic conditions subs...

Railway track-bed materials are mostly in unsaturated state, and their hydro-mechanical properties depend strongly on their water contents or suctions. In France, problematic soils such as collapsible loess and swelling marl can be origin of instability problems for new lines for high speed trains, while the hydro-mechanical behaviour of interlayer soil formed mainly by interpenetration of ball...

The Heavy Weight Deflectometer (HWD) test is one of the most widely used tests for assessing the structural integrity of airport pavements in a non-destructive manner. The elastic moduli of the individual pavement layers predicted from the HWD deflection measurements through inverse engineering analysis are effective indicators of pavement layer condition. The primary objective of this study wa...

A geotechnical evaluation of some soils in Numan, Adamawa, North –East, Nigeria has been carried out. This was done to determine the suitability of the soils for use as subgrade/filling, sub-base and base course materials for road construction. The samples were collected from five different areas, at surface and sub-surface levels. The areas are New Demsa, Farei, Dowaya, Numan Town and Imbru. T...

the paper aims at investigating the effects of chemical reaction and thermal radiation on the steady two-dimensional laminar flow of viscous incompressible electrically conducting micropolar fluid past a stretching surface embedded in a non-darcian porous medium. the radiative heat flux is assumed to follow rosseland approximation. the governing equations of momentum, angular momentum, energy, ...