Review Note
Last Update: 10/31/2024 01:04 AM
Current Deck: 6250 Questions
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Front
Evaluate the importance of timing in transitioning from excavation to permanent support installation. (5 marks)
Back
Minimizing Ground Relaxation and Deformation
- Importance: Delaying permanent support allows ground relaxation to progress, potentially leading to excessive deformation or convergence of the tunnel walls. Timely installation prevents ground loosening, reducing stress on the primary supports and minimizing the risk of collapse.
Maintaining Tunnel Shape and Stability
- Importance: Immediate progression to permanent support installation ensures that the tunnel retains its designed shape, as secondary deformations are quickly stabilized by the concrete lining. This timing is crucial in soft ground or highly jointed rock, where ground movement can be rapid.
Protecting Temporary Supports from Long-Term Loads
- Importance: Temporary supports are typically designed for short-term stabilization and may not withstand prolonged stress or environmental exposure. Installing permanent supports on schedule transfers the load away from temporary supports, preserving their integrity for future sections.
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