Applications
Welded wire mesh for underground ground support and mining
Welded wire mesh screen pinned with rockbolts and split-set friction stabilizers is the primary surface restraint for underground mine drifts and tunnels. Testing by the Western Australian School of Mines showed that 5.6 mm (4 gauge) welded wire mesh delivers high initial stiffness (resisting early rock dilation) and absorbs 3 to 6 kJ/m² of dynamic rockburst energy.
Surface support mechanics in underground excavations
In hard-rock underground mining, excavating tunnels (drifts, ramps, and cross-cuts) removes confining rock pressure, inducing high tangential stress concentrations around the opening.
Without immediate ground support, jointed rock masses dilate, unravel, and can violently eject fractured rock during seismic rockburst events.
Ground support operates as a two-component engineered system:
- Primary reinforcement (rockbolts): Inflatable bolts, rebar resin anchors, or friction stabilizers (Split Sets) drilled 1.8 to 3.0 m (6 to 10 ft) deep into solid host rock.
- Surface retention (welded wire mesh): High-strength steel wire screen pinned tightly against the rock surface beneath rockbolt face plates. Mesh transfers broken rock weight between adjacent bolts back into the anchored rock mass.
Laboratory performance: welded wire mesh vs chain-link mesh
Comprehensive static and dynamic rockburst testing conducted at the Western Australian School of Mines (WASM) compared welded wire mesh against woven chain-link diamond screen under heavy loading (Villaescusa, Player & Thompson, 2013):
| Ground Support Screen Type | Wire Diameter & Mesh Opening | Initial Static Stiffness (Rock Dilation) | Dynamic Energy Absorption (Ed) | In-Drift Installation Velocity | Flammability & Blast Resistance |
|---|---|---|---|---|---|
| 4 gauge welded wire mesh (Standard Mining Mesh) | 5.72 mm (0.225 in) wire; 102 × 102 mm (4 × 4 in) grid | High. High initial stiffness holds loose rock wedges tightly in place before fractures uncouple | 4.0 to 6.5 kJ/m² under simulated dynamic impact loads | Fast. Rigid sheets handle easily on mechanized jumbo bolter booms | Zero fire risk. Does not burn or melt under hot production blasters |
| 6 gauge welded wire mesh (Light Wall Mesh) | 4.88 mm (0.192 in) wire; 102 × 102 mm (4 × 4 in) grid | Moderate. Sufficient for drift sidewalls and secondary headings | 2.5 to 4.0 kJ/m² under static-cyclic test conditions | Fast. Lighter sheets reduce manual handling strain in trackless headings | Zero fire risk. High structural temperature resistance |
| High-tensile chain-link woven screen | 3.0 to 4.0 mm high-tensile wire; diamond aperture | Low. Highly flexible; requires significant rock displacement before engaging | 8.0 to 12.0+ kJ/m² (Extremely high displacement capacity) | Slower manual unrolling; tends to snag on equipment and loose rock ribs | High corrosion resistance; excellent for deep high-seismic rockburst ground |
Key testing insights from Villaescusa et al. (2013):
- Initial rock unravelling: Because welded wire mesh has rigid resistance-welded intersections, it mobilizes tensile resistance immediately upon the slightest rock movement (typically under 25 to 50 mm of displacement). This early restraint prevents loose rock blocks from keying out and initiating progressive collapse.
- Plate load transfer: Under high rock pressure, load transfers directly from the rock surface into the mesh wires and through the domed rockbolt washer plate. Rounding the edges of rockbolt plates prevents plate corners from prematurely cutting wire strands under heavy shearing loads.
- Failure mode: Under extreme rockburst displacement, welded wire mesh fails primarily through weld shear or wire tensile necking at the perimeter of the rockbolt plate after absorbing substantial plastic deformation energy.
Standard mining mesh panel formats
Unlike civilian concrete sheets measuring 8 × 20 ft, underground mining mesh panels are sized specifically to match drilling jumbo patterns, drift clearances, and transport cages:
- Standard sheet sizes: Typically 1.2 × 2.4 m (4 × 8 ft), 1.5 × 3.0 m (5 × 10 ft), or 1.8 × 3.0 m (6 × 10 ft).
- Mesh openings: Standard 102 × 102 mm (4 × 4 in) square grid, or 102 × 51 mm (4 × 2 in) heavy drift-back screen.
- Wire gauges: Heavy 4 gauge (5.72 mm · W4.0) for drift backs (roofs); 6 gauge (4.88 mm · W2.9) for drift sidewalls (ribs).
- Sheet finish: Black uncoated carbon steel for standard production headings; hot-dip galvanized (ASTM A1060) for long-term permanent ventilation raises, shaft stations, and corrosive sulphide ore zones.
Installation best practices in mine headings
- Overlap requirements: Overlap adjacent mesh sheets by at least two full mesh squares (200 mm · 8 in) along both ribs and backs. Under WASM mining guidelines, pinning overlapping wire loops under a shared rockbolt plate ensures continuous ground retention across sheet seams.
- Bolting pattern: Standard mining bolting arrays place rockbolts on 1.2 × 1.2 m (4 × 4 ft) or 1.5 × 1.5 m (5 × 5 ft) staggered square or diamond grids.
- Pinch-point elimination: Pre-cut sheets with smooth boundary wires prevent sharp wire stubs from puncturing miner work gloves or snagging pneumatic hoses.
Procuring mining mesh panels
For mining operations and geotechnical contractors requiring standard or custom dimension underground ground support mesh panels in 4 gauge, 6 gauge, or galvanized specifications, submit your required panel dimensions and delivery destination through our quote request form.
- Villaescusa, E., Player, J. & Thompson, A. (2013), Static and dynamic testing of welded and woven mesh for rock support, Minerals Engineering. Link
- Morton, P. et al. (2007), Testing and monitoring of ground support systems for deep mining, Australian Centre for Geomechanics.
- ASTM A1064/A1064M, Standard specification for carbon-steel wire and welded wire reinforcement for concrete. Link
- CSA G30.5, Welded steel wire fabric for concrete reinforcement. CSA Group.
Questions
Why is welded wire mesh used in underground mining?
Welded wire mesh pinned by rockbolts prevents loose rocks from falling between bolts, protecting equipment and miners from rockfalls and rockburst ejections.
What is the difference between 4 gauge and 6 gauge mining mesh?
4 gauge (5.72 mm wire) provides higher energy absorption (4 to 6.5 kJ/m²) for drift backs (roofs) subject to high gravity and seismic loads; 6 gauge (4.88 mm wire) is lighter and used primarily on drift sidewalls.
How does welded wire mesh compare with chain link in mines?
Welded wire mesh has higher initial stiffness, preventing small rocks from unravelling early; chain-link screen stretches significantly further, absorbing higher total energy in severe rockburst conditions.
Can mining mesh be shotcreted over?
Yes. Pinned welded wire mesh is routinely encapsulated with 75 to 100 mm (3 to 4 in) of wet-mix shotcrete to create composite permanent ground support liners.