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  Temporary ventilation management and recommendations for conventional

  ABSTRACT: Tunnels that are built with roadheaders or other continuous mining machines with multiple connections and ventilation tunnels have complex development and construction strategies. These development strategies are mainly aimed at achieving high productivity by simultaneously performing backend works along with the excavation of tunnel. The WestConnex M4-M5 Link Tunnels (WCX Stage 3A) project is a 7.5 km Sydney underground link connecting the operational M4 and M8 road tunnels. Delivery strategy for the project is to construct the tunnels from three tunnelling sites with excavation at front while civil and fit out works being performed in compartments behind. These co-activities lead to a bigger workforce and high number of machinery in the tunnel for which the temporary ventilation design should account for to maintain the air quality. Forced-overlap ventilation system was preferred during the development of tunnel followed by transition ventilation setups using push-pull ventilation through airlocks and impulse ventilation. Role of ventilation in dust management was purposefully limited to facilitate better dust management for planned activities along the tunnels.

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