Type of Anchored Rockbolt III Adhesion Resin Cement Friction High contact load High contact load Low contact load Expansion of bolt Expansion of bolt Compression.

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Presentation transcript:

Type of Anchored Rockbolt III Adhesion Resin Cement Friction High contact load High contact load Low contact load Expansion of bolt Expansion of bolt Compression of bolt Compression of bolt

Resin Grouted Rockbolt Advantages : - Convenient - Convenient - Simple - Simple - Very high str. anchor - Very high str. anchor Disadvantages : - Expensive - Expensive - Limited shelf-life - Limited shelf-life Applications : - Which cost is less - Which cost is less than speed & than speed & reliability reliability

Cement Grouted Rockbolt Advantages : - Inexpensive - Inexpensive - Simple - Simple Disadvantages : - Can’t be tensioned - Can’t be tensioned Applications : - Light support, mining - Light support, mining - Pipework, ventilation - Pipework, ventilation tube in civil eng. tube in civil eng.

Slot & Wedge Anchor Advantages : - Inexpensive - Inexpensive - Simple - Simple - Immediate tensioning - Immediate tensioning Disadvantages : - Small contact area - Small contact area - Local crushing - Local crushing - Unreliability in poor - Unreliability in poor rock rock Applications : - Rarely used today - Rarely used today

Expansion Shell Anchor Advantages : - High bolt load - High bolt load - Very reliable - Very reliable - Immediate tensioning - Immediate tensioning Disadvantages : - Expensive - Expensive - Required skill and - Required skill and supervision supervision Applications : - Permanent support - Permanent support for civil eng. for civil eng. - Non-grout use in - Non-grout use in mining mining

Split-set Dowel Advantages : - Quick to install - Quick to install - Simple - Simple - Cheaper than Cement - Cheaper than Cement Grouted Rockbolt Grouted Rockbolt Disadvantages : - Can’t be tensioned - Can’t be tensioned - Rusting - Rusting - Can’t be grouted - Can’t be grouted Applications : - Light support - Light support - Short-term support - Short-term support

Swellex Dowel Advantages : - High anchorage load - High anchorage load - Simple - Simple - Inexpensive - Inexpensive - Small axial force - Small axial force Disadvantages : - Can’t be grouted - Can’t be grouted - Strength up to tube - Strength up to tube Applications : - Medium-term reinf. - Medium-term reinf. in mining in mining