The relatively high concentrations of Ca2+, Mg2+ and HCO3 − in the surface water and groundwater in this area are derived from calcium-rich materials, which include backfill, construction materials, mine waste and the geological formations (Alhamed 2014).
In order for the programme to be sustainable this initial cost would also need to include "backfill" time for the professional facilitators.
We adopted the following standardized definitions of structural lesions of the SIJ on MRI, which were developed by the Canada Denmark MRI Working Group [ 4] and which were extended in a subsequent report to include backfill [ 5].
This reclamation probably included backfilling and some type of tree or grass planting.
Common reclamation goals include backfilling and regrading to a specified landform, replacing topsoil, and establishing a vegetation cover to meet the land use goals of the landowner.
The system including hydraulic backfill better minimizes displacements and the extraction coefficient usually ranges between 0.2 and 0.3.
The investigated parameters in this study included the backfill material properties, the geogrid tensile stiffness and length, the distance between the drilled shaft and the MSE wall, and the length of the drilled shaft.
The presented model uses Housner's two-mass approximation for fluid interaction and mass-spring-dashpot system for backfill interaction and accommodates a variety of features that may affect the behavior of rectangular tanks including fluid volume, backfill geometry, soil properties and flexible/rigid wall types.
Several geomechanical parameters affect the distribution of vertical and horizontal stresses in the backfill, including friction angle (( upphi^{prime } )), cohesion (c), Young's modulus (E), unit weight and Poisson's ratio.
The simulation results indicated complex geomechanical behavior of the bentonite backfill, including a nonuniform distribution of buffer porosity and density that could not be captured in an alternative, simplified, linear-elastic swelling model.
Adequate design of engineered barriers, including canister, buffer and backfill, is important for the safe disposal of high-level radioactive waste.
