Sydney’s NorthConnex Geological Anomolies (continued). By Gavin Bradford

1 May 2017

By Gavin Bradford

The dyke encountered in the Wilson Road Access Shaft has now been intersected in the mainline tunnels heading north. Photo shown is from this morning 1 May 2017. The top heading is almost through the feature. Those with a keen eye will note precautionary fibreglass face nails.

If you think Sydney’s Hawkesbury Sandstone at 85 metres below ground level is predictable, then think again. Here we have a shale band coinciding spot on with final floor level at the base of the main access shaft and H-Section area at the Wilson Road tunnelling site at West Pennant Hills. This has proven challenging for the roadheader development of this area and for the preparation of the site for operation of 4 No. Sandvik 520 roadheaders at full production. The floor is currently being concreted which will allow for roadheader excavation works to come into full swing early April 2017, along with the commissioning of the vertical spoil conveyor…..more updates coming soon.


Altre news: