Deep soil mixing tour
Tamar Estuary River Health Action Plan (TERHAP) project
Following on from the recent Horizontal Directional Drilling tour of the New Sewer Pipeline Project, a site visit is scheduled to view construction works for the Ti-Tree Bend Covered Storage Project. This involves construction of a new 10 Megalitre storage tank at Ti-Tree Bend Sewage Treatment Plant, Invermay. The storage tank is located at the northern end of the New Sewer Pipeline and is approximately 65m long by 40m wide by 6m high.
As is common in Invermay, the subsurface conditions around the existing sewerage treatment plant are characterised by soft soils to about 15 to 20m below ground level, overlying a low to medium strength rock (mudstone). To allow installation of the support piles, the piling contractor, Menards, propose deep soil mixing to improve insitu soil strength, then excavation of part of the improved soil to construct a piling platform, before finally installing the support piles. As the tank is founded below finished surface level within a flood zone, it will utilise a number of mechanisms including self-weight, piling and soil mixing to resist flotation.
The tour will be presented by Max Lazarus (Taswater CDO) and Joey Zhang (Menards).
Requirements
All participants MUST provide their own PPE and wear it on site. The required minimum PPE comprises:
- long trousers;
- long-sleeved shirt (if this shirt is not hi-viz, a hi-viz vest must be worn over the long-sleeved shirt & the vest buttoned/zipped up);
- steel-cap boots;
- safety glasses;
- hard hat.
Photography
TasWater will be taking photos and video of the attendees to use to promote the visit, which may include TasWater print and social media. TasWater will seek permission from the attendees to use their images.
Registration
The tour is free, but registration is essential as only 20 places are available.
Engineers Australia members participating in AGS technical sessions can record attendance on their personal CPD logs. Members should refer to Engineers Australia CPD policy for details on CPD types, requirements and auditing guidelines.