HEA Mesh

HEA Mesh

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Dynamic Bolts & Products - HEA Mesh

HEA Mesh
HEA Mesh
Where ground conditions are rock-burst prone and challenging, HEA mesh by DSI Underground provides improved surface containment with the addition of prelaced wire strand. In dynamic conditions where an excavation surface deforms, the strata loading is effectively transferred to all bolts and tendons, with a strong connection between the bolts and mesh offered by the HEA mesh installation. HEA mesh has the ability to allow large deformations whilst maintaining a high load capacity. This “yield-ability” of HEA mesh to absorb energy in dynamic and repeated loadings can complement yielding reinforcement as an element in a complete dynamic system.

Key Benefits

  • Superior containment of rock bursts.
  • Jumbo specific for rapid installation
  • Reduced shotcrete requirement.
  • Deformation plus strength for superior performance.
Product PropertiesTypical
Sheet Size*2400mm x 3000mm
Aperture100mm x 100mm
HEA Mesh Wire Diameter5.6mm
Mass Per Sheet45.5kg
(Strand) Diameter12.7mm
Tensile Strength1970kN

Indicative Performance*

HEA Mesh - Seismic event
Seismic event
HEA Mesh - Containment
Containment
Deformation (typical maximum value at sheet centre):
  • 900mm
Point loading (typical maximum value at sheet centre):
  • 17.5 tonne
HEA Mesh - Interlinked System
Interlinked System

Installation Overview

The pre-laced modular concept of HEA mesh is designed to meet the development intensive requirements of Jumbo based one pass mesh and bolt installations. This is achieved by the mesh behaving as standard mesh during handling and bolting. The bolting pattern provides interconnection of the cable lacing system between successive HEA mesh modules. Correct overlay of HEA mesh sheets and bolt placement is critical to ensure cable lacing performs as a complete system during a ground movement event. HEA mesh effectively removes the “weak link” of support systems. HEA mesh could provide a more cost effective solution to the high energy demands of rock burst containment.
DSI Underground Canada Ltd.

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