Offshore geotechnical engineering is a cornerstone of modern marine construction, supporting vital projects like oil rigs, wind farms, and underwater pipelines. By studying seabed materials, engineers ensure these structures are stable, safe, and resilient against the challenges of the marine environment. Achieving this requires advanced tools and technologies that gather, analyse, and interpret underwater data. Here, we delve into the essential equipment that makes it all possible.

Cone penetration testing (CPT) equipment

CPT equipment is a go-to for understanding soil properties on the seabed. The process involves pushing a cone penetrometer into the seabed at a controlled rate, measuring resistance to determine soil type, density, and strength. Key components include:

  • Cone penetrometer: This instrumented cone measures penetration resistance.
  • Push rods: These rods drive the cone into the seabed.
  • Data acquisition systems: Devices that capture and analyse the penetrometer’s data.

This equipment delivers real-time insights, making it invaluable for planning and executing offshore projects.

Borehole sampling tools

When laboratory analysis is needed, borehole sampling tools come into play. These tools extract soil and rock samples from seabed boreholes, offering detailed insights into material properties. The primary tools include:

  • Core Barrels: These cylindrical tools extract continuous cores of soil or rock.
  • Split Spoon Samplers: Used in standard penetration tests (SPT) to collect disturbed soil samples.
  • Box Corers: Large devices that gather undisturbed soil samples from the seabed surface.

With these tools, engineers can assess material strength and composition with precision.

Geophysical survey equipment

Geophysical surveys offer a non-invasive way to map and analyse the seabed and its underlying structures. Commonly used equipment includes:

  • Side-scan Sonar: Emits sound waves to create detailed images of the seafloor.
  • Sub-bottom Profilers: Use low-frequency sound waves to reveal sub-surface layers.
  • Multibeam Echosounders: Generate high-resolution topographic maps of the seafloor.

These tools help engineers visualise and understand the seabed environment, aiding in strategic decision-making.

Seismic survey equipment

Seismic surveys uncover geological formations beneath the seabed, essential for resource exploration and structural planning. Equipment includes:

  • Air guns: Produce sound waves that penetrate the seabed, reflecting off geological layers.
  • Hydrophones: Arrays of underwater microphones that capture reflected sound waves.
  • Seismic vessels: Specialised ships equipped with air guns and hydrophones.

This equipment provides a detailed understanding of the seabed’s geology, critical for designing stable offshore structures.

Advancing offshore geotechnical engineering

The specialised tools used in offshore geotechnical engineering are vital for accurate seabed assessments. Each plays a unique role in collecting and analysing data, ensuring the safety and reliability of marine structures. As technology evolves, these tools continue to improve, enabling even more efficient and precise investigations.

Whether you’re planning a new offshore project or maintaining an existing one, having access to the right equipment is key. At EEL, we offer a wide range of geotechnical and geophysical equipment for hire, tailored to meet the demands of your project. Get in touch if you’d like to find out more.