3.2.2. Under Both Axial Pull and Lateral Shear3.3. Performance of Energy-Absorbing Rockbolts; 3.3.1. Cone Bolt; 3.3.2. D-Bolt; 3.3.3. Garford Bolt; 3.3.4. Yield-Lok; 3.3.5. Durabar; 3.3.6. Roofex Bolt; 3.3.7. He Bolt; 3.4. Field Observations; References; Chapter Four: Mechanics of Rockbolting; 4.1. Types of Rockbolts; 4.2. Rockbolt Models; 4.2.1. Two-Point Anchored Rockbolts; 4.2.2. Fully Encapsulated Rockbolts; 4.2.3. Frictional Rockbolts; 4.2.4. Energy-Absorbing Rockbolts; 4.3. Interaction of Rockbolts With Rock; 4.3.1. Lang's Physical Model; 4.3.2. Loading Patterns In Situ
4.3.3. Fully Encapsulated Rockbolts4.3.4. D-Bolt; 4.3.5. Inflatable Rockbolts; The Primary Contact Stress; The Secondary Contact Stress; The Borehole Pressure pi; Anchoring Mechanisms in Soft and Hard Rock; 4.4. Interaction of Rockbolts With Other Types of Support Devices; 4.5. Principles of Rock Support; 4.5.1. Ground Response Curve (GRC) and Support Characteristic Curve (SCC); 4.5.2. Construction of GRC; 4.5.3. SCC of Rockbolts; The Stiffness of Two-Point Anchored Rockbolts; The Stiffness of Fully Encapsulated Rebar Bolts; The Stiffness of Frictional Rockbolts
The Stiffness of Energy-Absorbing RockboltsReferences; Further Reading; Chapter Five: Rockbolting Design; 5.1. Failure Modes of Rockmasses In Situ; 5.1.1. Block Fall Under Gravity; 5.1.2. Shear Failure in Soft and Weak Rock; 5.1.3. Extension Failure in Hard Rock; 5.1.4. Rockburst; 5.2. Loading Conditions Underground and Suitable Rockbolt Types; 5.2.1. In Low Stress Rockmasses; 5.2.2. In High Stress Rockmasses; 5.2.3. Suitable Rockbolt Types; 5.3. Design Principles; 5.3.1. Natural Pressure Arch; 5.3.2. Design Methodology; Australian Methodology; Canadian and Scandinavian Methodology
Summary
This volume brings current theoretical and practical developments in the most widely used support device for underground rock excavations.