Case Study: Stabilising Mine Site Conveyor Infrastructure Foundations

Our Solution:

Our Client engaged Resinject to propose a suitable solution to raise and re-level the effected foundation slabs, that would have the conveyor down for as little time as possible. Subsequently, Resinject’s experienced consultants promptly attended the site and assessed the foundation  issues.

It was discovered that the pad footings for the trestle and the slab for the main drive head were sitting on a considerable amount of under compacted overburden which was also experiencing regular ingress of surface and ground water. These were deemed as the primary mechanisms causing the settling and  subsiding of the foundations.

To raise and re-level the Main Conveyor Drive Head foundation slab, Resinject proposed a slabjacking solution consisting of a small grid of injection points across the slab area. Following this, a series of stabilising piers were proposed to a depth of 1.5m centres around the perimeter of the slab to counteract any future subsidence by improving the load bearing capacity of the ground ensuring longevity of the re-leveling works.

To raise and re-level the Trestle Leg footings, Resinject proposed a tiered ‘pier pad’ solution with deep injections at 1.0m, 1.5m, 2.0m, 2.5m, 3.0m and 3.5m underneath the 750mm footings. Our Client agreed to the proposed solution and Resinject’s services were booked in for shortly thereafter.

After completing the proposed slab-jacking and pier-pad injection solution, Resinject re-measured the levels of the Main Drive Head foundation slab and Gantry Trestle Pad footings. It was found that Resinject had achieved a lift of 38mm from the previous settled position on the gantry trestle pad footings, raised to a corrected level of within 2mm of each other.

Furthermore, Resinject services were completed within a 3-day timeframe, and with the foundations and footings successfully raised and re-levelled, the conveyor was able to be re-started immediately thereafter.

Resinject-Case-Study_Stabilising-Mine-Site-Conveyor-Infrastructure-Foundations-FINAL-2.pdf