For the same cement-sand ratio, the tensile failure range of the stope structure gradually decreases and no obvious penetration of the pillar is observed with the increase in the backfill
Liu, "Transportability and pressure drop of fresh cemented coal gangue-fly ash backfill
slurry in pipe loop," Powder Technology, vol.
The rheological property is sensitive to the variation of backfill
According to the literature , it is assumed that the stiffness of normal springs can be equivalent to the coefficient of a subgrade reaction of the backfill
and that the stiffness of the tangential springs is a function of the stiffness of normal springs.
Therefore, to account for stress from external backfill
, a 10-mm annular plate is usually selected.
Ventilation was provided across the top of the entire backfill
until the final lift was poured and the backfill
mining technology, first proposed by China University of Mining and Technology, is regarded as an important component, having been successfully implemented in the first paste backfill
mining demonstration experiment.
One joint of a gasket pipe was tested with bulkhead installed on each side for water tightness without backfill
Specialists, with an annual turnover of some EUR18m (USD23.3m), provides technical consulting and engineering services, focusing on mine backfilling technologies.
The deepest shaft which is now entirely closed with concrete backfill
, reached a depth of 420 m at approx.
If the backfill
is not adequate, the screw output will be unstable and even the smallest variation in output entering the discharge section will cause the screw to vary in its fill length.
If it is too deep, backfill
with soil, not compost, and firm well, or it will tend to sink.