The Stabilization Of The Excavation Face Of A
Shallow Tunnel In Difficult Ground Conditions
Author(s)
P. Oreste
Abstract
The stability of the excavation face of shallow tunnels excavated in difficult
ground conditions is at present a relevant problem in the tunnelling sector. Even
though face reinforcement interventions with fibreglass dowels have proved to
be efficient, there is still no reliable analysis and dimensioning method available.
A new calculation procedure is illustrated in this paper for the analysis of the
face static condition in shallow tunnels and also for when reinforcement
interventions with fibreglass dowels are used. The procedure is based on the
limit equilibrium method applied to the ground core ahead of the face. The main
result of the calculation is that the safety factor of the excavation face is also
obtained in the presence of reinforcements and from this it is then possible to
proceed with the dimensioning of the intervention. The procedure has been
applied to two real cases and satisfactory results have been obtained.
Keywords: fibreglass dowels, face reinforcement, surface tunnel, limit
equilibrium method, factor of safety.
Keywords
fibreglass dowels, face reinforcement, surface tunnel, limit
equilibrium method, factor of safety
Related Book
Other papers in this volume
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