The Project
In the unique and challenging terrain of Miles, Queensland, known for its distinctive gilgai terrain, a pivotal infrastructure project was initiated to enhance the operational efficiency of drilling activities. The project required the construction of drilling leases, each spanning roughly 10,000 square meters (113m x 88m), designed to support heavy drilling rigs that weigh approximately 105,000 kilograms distributed across seven axles. Given the soft and malleable ground conditions, especially after rainfall, providing a stable and durable platform for these rigs was paramount. The InfraGrid40-40C, a biaxial composite geogrid, was selected as the cornerstone for this solution, offering a cost-effective and reliable method for ground stabilization beneath a layer of gravel/rock.
Challenges
The gilgai terrain of the area presents a notoriously difficult challenge for heavy machinery access due to its micro-relief patterns caused by the expansive nature of clay soils. These conditions are exacerbated in wet weather, leading to soft soils that are susceptible to deformation under heavy loads. The project's success hinged on the ability to create a stable platform that could support the heavy drilling rigs without the risk of bogging down or causing uneven settlement.
Traditional ground preparation techniques, such as the importation of extensive fill or the complete excavation and replacement of native soils, were deemed impractical due to their high cost, environmental impact, and the time constraints associated with drilling schedules. Additionally, the project demanded an approach that minimized ecological disturbance and preserved the natural landscape as much as possible.
