Rockfall barriers with **upslope anchorage** are high-performance interception systems designed for contexts where impact energy and slope geometry require additional stability compared to "standard" configurations relying on base anchorage only. The system combines a flexible interception net with **upslope bracing/anchorage lines** that improve post stability, control deformation, and help preserve the working geometry during severe events.
These solutions are typically adopted on **steep slopes**, with long runout trajectories and in proximity to critical infrastructure (roads, railways, plants), where reliable behavior and controlled deformation are required.
Our products provide induced-pressure absorption capacity **up to 212 kPa**.
Schematic of a barrier with upslope anchorage: load paths through longitudinal ropes, bracing lines, lateral connections, and energy dissipators
### Principle of operation
At impact, the barrier deforms in a controlled manner. Energy is managed through:
- **Net deformation** (interception and containment),
- **Load transfer** to longitudinal ropes and posts,
- **Energy dissipators** (progressive braking elements),
- **Upslope anchors/bracing lines** that stabilize the posts and limit undesired rotations.
The goal is to **reduce peak forces** and distribute loads along the structure, maintaining where possible functionality and inspectability after the event (depending on impact severity).
### Main components (typical configuration)
A high-energy barrier with upslope anchorage generally includes:
- **Posts (steel sections, e.g., HEA 160)**: vertical elements defining the barrier alignment and supporting the net.
- **Steel ring-net panels / high-strength mesh**: the interception surface connected to ropes and posts.
- **Upper longitudinal rope**: supports the top edge of the net and distributes loads between spans.
- **Lower longitudinal rope**: stabilizes the bottom edge and transfers forces to foundations/anchors.
- **Intermediate rope**: transfers impact actions directly to lateral anchors (used for very high-energy barriers only).
- **Upslope bracing/anchorage lines**: tiebacks/bracing that counteract post overturning and stabilize the barrier.
- **Lateral bracing rope**: stabilizes end bays and helps maintain alignment.
- **Side connection ropes**: connect barrier edges to end anchors and guide load paths.
- **Energy dissipators**: devices installed on selected ropes to absorb energy and limit peak loads.
> Diameters and layout are indicative; the exact configuration depends on the required energy class, span geometry, allowable deflection, ground capacity, and site constraints.
### Expected performance
Upslope-anchored configurations are selected for **high-energy** scenarios where the barrier must provide:
- high absorption capacity,
- controlled deformation (deflection),
- post stability under peak loading,
- clear and verifiable force paths towards anchors and foundations.
Example installation of a rockfall barrier with upslope anchorage
### When to choose upslope anchorage
Upslope anchorage/bracing is recommended when:
- the slope is **very steep** and post stability is critical,
- **high energy classes** and/or additional redundancy are required,
- it is important to **limit post rotation** and preserve the working geometry,
- upslope anchors can be installed and inspected,
- foundation conditions benefit from distributing loads across multiple anchor points.
### Design and installation notes
- **Anchor capacity and geometry**: upslope anchors must align with the intended load path and be verified for the design actions.
- **Deflection management**: ensure sufficient clearance downslope of the barrier (morphology, structures, road/rail corridor).
- **Maintenance**: after an event, inspect dissipators, rope tensioning, clips/shackles, net connections, and any post deformation.
### Related application: shallow landslides and debris flows (open slope)
In some contexts, interception barriers are configured to withstand **pressure-type actions** generated by shallow landslides or debris flows on open slopes. The construction concept remains similar (posts, ropes, dissipators, net), but sizing focuses on **induced-pressure capacity** and debris-retention mechanics.
### Support for selection and detailing
With slope geometry, available deflection distance, and geotechnical information, we can support configuration selection through trajectory/energy assessment and preliminary sizing.
