World Tunnel Congress Papers 2022 by Amberg

Correlating rock support and ground treatment means with in-tunnel seismic data

Tunnelling is a challenging task since it demands recurrent interaction and good understanding of the various disciplines of geotechnical engineering, geology and geophysics among others. Moreover, during tunnel excavation quantitative and qualitative data is continuously gathered by instruments and personnel from all these disciplines. Finding and understanding correlations between such datasets might provide useful information for the tunnelling work, hence, this task is not always straightforward and requires thorough analysis and validation of involved data. An interesting rock mass physical property is the seismic velocity, which is obtained during tunnel excavation easily and fast. Moreover, due to the physical relationship between seismic velocities and rock mass moduli, we investigate the correlation of geotechnical parameters derived from seismic data with common engineering practice for safe and efficient tunnel excavation. A real example shows how deviated parameters are in good correlation with rock classes in difficult sections during tunnel excavation.

Towards Optimum Control and Operation of Tunnel Ventilation Systems

Ventilation design for normal and emergency conditions is frequently carried out based on purely steady-state considerations.
While this is allowable to some extent in comparatively simple cases, there are situations, where this approach completely fails. In such situations both ventilation and ventilation-control design must take dynamic effects into account. This is particularly important for ventilation control. This paper discusses the impact of transient effects on optimum ventilation strategies as well as practical ventilation-control issues and requirements.

Environmentally Friendly Ventilation of Complex Underground Infrastructures

Ventilation is a primary requirement for all kinds of complex underground facilities, both in normal operating conditions and in case of fire. Experience shows that the environmental footprint of complex ventilation systems can be very large. Different ventilation concepts used for underground facilities can have widely different energy consumptions. The present paper focuses on the importance of reducing the environmental impact of such facilities by means of energy-efficient ventilation systems, for example by using natural ventilation in an extensive manner.