Jomas were contacted by Brunel University to work on a significant project aimed at enhancing student facilities whilst addressing important safety concerns.
When Brunel University was constructed in 1966, it utilised Reinforced Autoclaved Aerated Concrete (RAAC), a cost-effective material valued for its excellent fire resistance. However, as safety standards evolve, the use of RAAC has raised concerns due to its deteriorating properties as it ages, with many structures now exceeding their expected lifespan. Recognising the importance of student safety and well-being, Brunel has initiated a project to replace these structures. As a local business we were thrilled to be chosen for this project; the project involves the construction of three temporary single-storey buildings across existing car parks, providing much-needed space for lectures and study—an essential measure while the original buildings are being addressed.
To ensure the safety and integrity of the new structures, we began with a thorough Desk Study, followed by intrusive works including both geotechnical and geo-environmental investigations and assessments. Our team drilled four cable percussive boreholes to a depth of 25 meters, assessing the ground conditions and determining preliminary pile capacities essential for supporting the new buildings. Additionally, we conducted ten windowless sampler boreholes to further assess shallow ground conditions alongside three trial pits to facilitate soil infiltration testing for effective soakaway design. Nine in-situ California Bearing Ratio (CBR) tests were carried out to inform road and pavement design, ensuring that all new constructions will be safe and durable. To monitor environmental conditions, we installed six monitoring wells and committed to bi-weekly ground gas and groundwater assessments.
A unique challenge was the presence of unknown service tunnels that wind beneath the university complex. Their purpose and contents remained unclear, necessitating heightened vigilance during our work. Through meticulous planning and methodical mapping, we identified safe locations to extract samples while avoiding potential damage to these tunnels, as well as other underground utilities like electricity, drains, and communications.
This careful consideration limited our working space, making it crucial for our team to strategically select borehole and trial pit locations. Our goal was to obtain a comprehensive spread of data while ensuring no disruption to existing services.
Throughout the project, we worked closely with the university to implement a phased approach for closing off the three car parks sites. This careful planning ensured that not all car parks were unavailable at the same time, minimising disruption for students and staff. During our return monitoring visits, we maintained access to car parks while fencing off small sections, balancing the need for ongoing work with the university’s operational requirements.
Our investigations revealed variable ground conditions across the three plots, with Jomas providing recommendations appropriate to each. The Made Ground and Langley Silt Member strata were considered unsuitable for founding due to their inconsistent and low bearing properties, coupled with an unacceptable risk of total and differential settlement. In response, we provided tailored foundation recommendations for each plot, taking into account the varying geological conditions.
Collaborations with local businesses like Brunel University strengthens community ties and creates networking opportunities allowing businesses to continue to connect with local organisations and stakeholders.
