mark okoth
Jul 20
Describe passive support system and active support system in tunneling??
1 view
1 view
2 answers
Sort By
ChatGPT
Jul 20
Passive support systems in tunneling refer to the use of structural elements such as rock bolts, shotcrete, steel ribs, and wire mesh to provide stability and reinforcement to the tunnel walls. These elements are installed during the excavation process and help to prevent collapses and maintain the integrity of the tunnel structure. Passive support systems are typically used in stable ground conditions where there is minimal risk of ground movement.
On the other hand, active support systems in tunneling involve the use of mechanical devices such as hydraulic jacks, ground anchors, and grouting to actively control and stabilize the ground around the tunnel. These systems are used in more challenging ground conditions where there is a higher risk of ground movement and instability. Active support systems are designed to respond to changes in ground conditions and provide additional reinforcement as needed to ensure the safety and stability of the tunnel.
Overall, passive support systems provide a more permanent and long-term solution for tunnel stability, while active support systems offer more flexibility and adaptability to changing ground conditions. Both types of support systems play a crucial role in ensuring the safety and success of tunneling projects.
On the other hand, active support systems in tunneling involve the use of mechanical devices such as hydraulic jacks, ground anchors, and grouting to actively control and stabilize the ground around the tunnel. These systems are used in more challenging ground conditions where there is a higher risk of ground movement and instability. Active support systems are designed to respond to changes in ground conditions and provide additional reinforcement as needed to ensure the safety and stability of the tunnel.
Overall, passive support systems provide a more permanent and long-term solution for tunnel stability, while active support systems offer more flexibility and adaptability to changing ground conditions. Both types of support systems play a crucial role in ensuring the safety and success of tunneling projects.
0
Google Gemini AI
Jul 20
Passive Support System
- Definition: A support system that relies solely on the inherent strength of the ground or rock to maintain stability.
- Mechanism: The natural arching effect of the ground or rock above the tunnel creates a self-supporting structure.
- Components:
- Earth pressure: The force exerted by the surrounding ground or rock.
- Arch action: The ability of the ground or rock to transfer loads from above into the sides of the tunnel.
- Advantages:
- Less expensive and complex than active systems.
- Minimal maintenance required.
- Disadvantages:
- Suitable only for stable ground conditions.
- Limited load-bearing capacity.
Active Support System
- Definition: A support system that uses external forces to maintain stability.
- Mechanism: Structural elements, such as bolts, anchors, or shotcrete, are installed to support the ground or rock and prevent collapse.
- Components:
- Bolts: Steel rods installed into the ground or rock to reinforce the structure.
- Anchors: Devices that connect bolts to the tunnel wall, providing additional support.
- Shotcrete: A spray-applied concrete lining that strengthens the tunnel wall.
- Advantages:
- Capable of supporting unstable ground conditions.
- Provides high load-bearing capacity.
- Allows for flexibility in design.
- Disadvantages:
- More expensive and complex than passive systems.
- Requires regular maintenance.
Comparison
| Feature | Passive Support System | Active Support System |
|---|---|---|
| Mechanism | Arch action | External forces |
| Cost | Less expensive | More expensive |
| Complexity | Less complex | More complex |
| Maintenance | Minimal | Regular |
| Ground conditions | Stable | Unstable |
| Load-bearing capacity | Limited | High |
| Flexibility | Limited | Flexible |
- Definition: A support system that relies solely on the inherent strength of the ground or rock to maintain stability.
- Mechanism: The natural arching effect of the ground or rock above the tunnel creates a self-supporting structure.
- Components:
- Earth pressure: The force exerted by the surrounding ground or rock.
- Arch action: The ability of the ground or rock to transfer loads from above into the sides of the tunnel.
- Advantages:
- Less expensive and complex than active systems.
- Minimal maintenance required.
- Disadvantages:
- Suitable only for stable ground conditions.
- Limited load-bearing capacity.
Active Support System
- Definition: A support system that uses external forces to maintain stability.
- Mechanism: Structural elements, such as bolts, anchors, or shotcrete, are installed to support the ground or rock and prevent collapse.
- Components:
- Bolts: Steel rods installed into the ground or rock to reinforce the structure.
- Anchors: Devices that connect bolts to the tunnel wall, providing additional support.
- Shotcrete: A spray-applied concrete lining that strengthens the tunnel wall.
- Advantages:
- Capable of supporting unstable ground conditions.
- Provides high load-bearing capacity.
- Allows for flexibility in design.
- Disadvantages:
- More expensive and complex than passive systems.
- Requires regular maintenance.
Comparison
| Feature | Passive Support System | Active Support System |
|---|---|---|
| Mechanism | Arch action | External forces |
| Cost | Less expensive | More expensive |
| Complexity | Less complex | More complex |
| Maintenance | Minimal | Regular |
| Ground conditions | Stable | Unstable |
| Load-bearing capacity | Limited | High |
| Flexibility | Limited | Flexible |
0
