Emergency Stabilisation Restores Access at Chywoone Hill, Penzance

Jointline has successfully completed the emergency stabilisation and reconstruction of a failed retaining wall at Chywoone Hill, Penzance, restoring a critical access route following a significant landslip event.

The original wall failure resulted in the immediate closure of the road due to the risk of further ground movement, forcing a 13-mile diversion and causing sustained disruption to residents, businesses and emergency services. Appointed by Trinity Claims on behalf of the landowner, Jointline was tasked with delivering a technically robust solution within a constrained and high-risk environment, while addressing reduced public confidence following previous delays and contractor withdrawal.

The scheme presented a complex geotechnical challenge, with the embankment rendered unstable and at risk of further collapse. Full road closure was maintained to ensure public safety while stabilisation and reconstruction works were undertaken.

Jointline commenced works with a detailed site assessment and controlled excavation of failed material. To stabilise the embankment, a soil nailing system was installed, comprising 86 steel pins drilled and grouted into the slope to provide both immediate and long-term ground reinforcement. This approach increased shear resistance within the slope and enabled subsequent construction activities to proceed safely.

Following stabilisation, a reinforced retaining wall was constructed to provide long-term structural integrity. The design incorporated a fully integrated reinforcement system and a comprehensive drainage solution, including weep holes and free-draining backfill, to mitigate hydrostatic pressure. A traditional locally sourced granite facing wall was then installed and mechanically tied to the structure, ensuring durability while maintaining visual consistency with the surrounding environment.

The embankment was reinstated using engineered fill, finished with topsoil and seeding to promote natural regeneration. The highway infrastructure, including surfacing and road markings, was fully reinstated, allowing safe reopening of the route.

Safety remained central to delivery throughout the project. Jointline implemented detailed risk assessments and method statements, controlled excavation processes, continuous monitoring of slope behaviour, and strict site access controls. The integration of the pinning system was critical in reducing immediate ground risk and maintaining a safe working environment.

Recognising the importance of stakeholder confidence, Jointline prioritised transparent and proactive communication. A public meeting was held prior to mobilisation to explain the failure mechanism, outline the engineering approach, and justify the continued road closure. A dedicated project website, supported by on-site QR codes, provided regular updates and direct access to the project team.

Jointline worked closely with Cornwall Council Councillor Thalia Marrington, who supported communication efforts within the community, said: "Clear communication was essential on this project, and Jointline demonstrated a strong commitment to keeping residents informed. Their willingness to engage directly with the community helped to address concerns and build confidence as the works progressed."

The project was completed ahead of programme, enabling the road to reopen earlier than anticipated and removing the need for the extended diversion. The reconstructed retaining wall now provides a durable and resilient solution, significantly reducing the risk of future instability.

Community engagement remained a defining aspect of the project. Residents demonstrated consistent support for the workforce, and in a notable moment, the team temporarily made the site safe and reopened the road to allow the funeral cortege of Doreen Sutton to pass through without undertaking the diversion. This reflected a high level of sensitivity, respect, and commitment to the needs of the local community.

At the formal reopening, Doreen’s husband, Jeff Sutton, carried out the ribbon cutting. He remarked that the structure would be remembered as “Doreen’s Wall”, establishing a lasting and meaningful connection between the scheme and the community.

To mark completion, Jointline hosted a community event and delivered social value initiatives, including donations to a local food bank and financial support for the Penlee Lifeboat (RNLI), reinforcing the project’s legacy beyond its engineering outcomes.

Jointline’s Managing Director, Gary Massey, maintained a visible presence throughout the scheme and commented: "This project required not only technical expertise but also a strong commitment to safety and community engagement. By working closely with residents and stakeholders, we were able to deliver a solution that restores both the infrastructure and confidence in its long-term stability."