Durapak®

Durapak® cellular lightweight concrete blocks, reinforced with annealed steel wire mesh and polypropylene fibres, are engineered for optimal gully protection through high inital stiffness and a flat Load vs Deformation curve.

BENEFITS

  • Increase ore reserves by improving the percentage ore extraction and safely decrease the pillar size
  • Improve grade by better stope width control and no loss of gold fines inside the pack
  • Significantly reduce rockfalls and rockburst damage
  • Maximise material car utilisation
  • Eliminate fire risks

DESIGN FEATURES

MATERIAL AND STRUCTURAL PROPERTIES PERFORMANCE
High E-Modulus (stiffness) at underground closure rates (1mm - 50mm per day)
  • Generates the required initial stiffness when deformed at slow loading rates
  • Required support resistance is reached after only 1-2,5% closure
  • This ensures active support and early maintenance of strata integrity
  • Does not creep and loses load at slow deformation rates
Designable yield load
  • Yields at predetermined loads
  • Does not generate too much load, which may damage the roof or floor
Durapak maintains post yield during closure
  • No load shedding takes place during post yield
  • Allows controlled closure of the workplace
Constant low crushing strength, during rapid loading over a large deformation range
  • Durapak® has the ability to reduce the impact of a rockburst. The mechanism of dissipating the kinetic energy, serves to increase the deformation range, rather than increase the force generated. It therefore acts like a shock absorber during impact, not like a stiff spring
  • This prevents damage to the surrounding rock mass during rapid closure
Material properties are homogenous and non-biodegradable
  • The performance is repeatable and not affected by time or hostile environments
  • Ensures that all support elements and structures behave in the same manner at all stages of closure
100% surface contact between individual units
  • Ensures that no point loading occurs in the structure, as this will negatively affect all the above-mentioned properties
Buckling stability during normal- and rapid closure
  • The pack will not buckle when it is built according to specifications, using Durapak® units
Fire resistant material
  • Non-combustible.

DURAPAK®'S IDEAL LOAD DEFORMATION CHARACTERISTICS

TRANSPORT

  • Pallets customised as required
  • Optimised utilisation of the mine's transport infrastructure
  • Safe and easy to transport

HANDLING

  • Tailormade for mono-rope winches
  • Impact resistant during transport and handling
  • Lightweight for easy handling and fast pack construction

IN THE STOPE

  • Immediately active stope support
  • Close-to-face installation
  • No loss of fines in packs due to the solid construction
  • Effective pre-stressing eliminates blast outs
  • Fire resistant

 Download Durapak® Brochure (837 KB)

AttachmentSize
Durapak.pdf867.09 KB
Durapak 60-50.pdf732.78 KB
Durapak 60-120.pdf714.09 KB
Durapak 60-300.pdf703.1 KB