Snowy Hydro has given an update on construction progress at the Snowy 2.0 pumped storage project in Australia, with particular focus on work on the surge shaft at the Marica site. It has also refuted any claims that TBM Florence had stopped tunnelling, confirming it is fully operational and is now more than 800m into excavation of the headrace tunnel at Tantangara.
The surge shaft measures over 80m deep and 28m in diameter. Current construction methods involve temporary support using rock bolts and shotcrete, with plans for a permanent concrete lining upon completion.
Excavation efforts at the site employ various techniques, including the utilization of 36-tonne excavators that deposit material into kibbles, which are then lifted and transferred to dump trucks. Additionally, the integration of a work platform and personnel hoist is in its final stages, facilitating safe worker access as the shaft delves deeper into the ground.
Meanwhile, the project faces logistical challenges at Marica Trail, the newly established access road leading to the surge shaft site. Spanning a length of 6.5km with an elevation change of approximately 320m, the road's construction demanded meticulous planning and execution. Specialized rope access workers were enlisted to ensure safety and stability, particularly in the face of the region's rugged terrain. Despite these hurdles, Marica Trail now offers all-weather access for traffic, including heavy vehicles.
Transitioning to the Tantangara site, efforts are underway to connect the intake and gate shaft through drill and blast excavation
Recent reports suggesting a halt in tunnelling by TBM Florence have been refuted, with project authorities confirming the machine's continued operation. TBM Florence has surpassed the 800m mark in excavation, successfully navigating through soft ground into more resistant rock formations. Snowy Hydro's ongoing investigation into de-risking headrace tunnel construction by excavating from the opposite end further underscores the project's commitment to efficiency and safety.
