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Australia
Sub-industry
Reclaim Tunnel
Problems
Subsidence
Location
Australia
Year
Solutions
Re-levelling
Technology
JOG
Problem
The ROM reclaim tunnel and much of the coal infrastructure is built on historic deep mine fill, which had been undergoing long-term consolidation.
The site featured approximately 3 meters of engineered fill on top of 30 meters of loose and voided ground fill. This consolidation had caused global settlement of surface and underground infrastructure.
While the global settlement is manageable, differential settlement between connected elements has exceeded tolerable limits and requires correction. Without intervention, this settlement could or lead to misalignment and damage to the infrastructure.
Solution
Mainmark worked alongside site designers to integrate its JOG computer-controlled grouting technology for future correction of critical infrastructure.
Injection tubes were embedded within the site’s concrete footings, allowing for level correction. Once the infrastructure required adjustment, Mainmark injected the JOG system through 39 ports, correcting the differential settlement.
Result
The JOG computer-controlled injection technology successfully re-levelled the ROM reclaim tunnel by an average of 225mm.
The entire process was completed efficiently over two weeks, restoring the infrastructure’s functionality and stability.
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Mainmark Ground Engineering Pty Ltd
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