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Earthwork Retaining Solutions – Part 2 – Sheet Piles, Trench Boxes & L Walls

The second review of the design considerations for different types of temporary earth retaining solutions. The webinar looks at the different types of temporary earth retaining structures, focusing on practical demonstrations of the implementation of sheet piles, trench boxes and L walls.

Webinar Overview

Panelists: Joshua Martin (Andun Engineering Consultants)

Date: 22nd October 2021

Duration: 31:47

The webinar starts by reviewing the types of temporary earth retaining structures and the use cases for each type. Then there is discussion about the causes of failure and the design considerations that can be taken to analyse solutions and avoid failure across different scenarios.

Gravity Walls

  • Mass concrete gravity walls
  • Gabions (Bag work wall)
  • Interlocking block walls (lego blocks)
  • Reinforced concrete cantilever walls (L walls)

Embedded Walls

  • Trenching systems
  • Sheet-pile walls
  • King post (‘Soldier pile’ or ‘Berlin’ walls)

Composite Walls and Other Support Systems

  • Combined systems
  • Anchored earth/ support uning ground anchors/ soil nailing
  • Reinforced soil (MSE) structures AKA geogrid reinforced walls

Content Outline

  • Types of Temporary Earth Retaining Structures (0:00)
  • Gravity Walls (0:43)
  • Embedded Walls (3:47)
  • Composite Walls (05:28)
  • Causes of Failure (08:51)
  • Trench Boxes (14:23)
  • Sheet Piles (16:55)

Case Study – Artisan Heights Unite Student Tower (22:44)

This was the use of L Walls at Artisan Heights in Manchester.

The principal contractor was Bowmer & Kirland, Curtins were the structural engineers with Andun Engineering Consultants providing temporary works design support.

This was a compact site with a number of engineering constraints.

The L walls were the most effective design solution as they were versatile, off-the-shelf items that were adaptable. They also helped utilise space effectively and required smaller plant on on a site with a tight footprint with constrained access. The final advantage was cost compared to other solutions that were explored at the concept stage.

Additional Resources

We recommend taking a look at the first webinar Andun delivered on this subject – Earthwork Retaining Solutions Part 1