Wilton Park Trench Fill Soil Modification

Trench Fill

Wilton Park Trench Fill Soil Modification

Furlong GS designed and treated excavated material at Wilton Park, Beaconsfield, for reuse as acceptable trench fill, working with Reynolds Groundwork Services and Thames Water on a modified soil backfill solution.

Wilton Park, Beaconsfield 5 days

Project Overview

Excavated Material Reuse

Deep adoptable drainage works at Wilton Park generated approximately 3,000m3 of excavated material. Furlong GS worked closely with Reynolds Groundwork Services and Thames Water to develop a modified soil backfill solution, enabling site-won material to be reused rather than removed and replaced with imported trench fill.

Laboratory Testing and Treatment Design

Following analysis and laboratory testing of the host material, Furlong GS designed the soil modification for use as backfill with a minimum 5% CBR target. The case study references MCHW Series 600 and CC201 in its design approach.

Treatment and Compaction

A tractor-mounted WS250 Wirtgen mixer and Streumaster SW 3 AC binder spreader were selected to suit changing levels and working conditions. Excavated material was treated alongside the trench, placed as backfill and compacted using a machine-mounted padfoot compactor.

Project Benefits

The design and treatment package allowed the client to utilise site-won material as modified trench fill and save time and money. The published benefits charts report 50% cost saving, 45% programme reduction, 80% fewer vehicle movements, 80% less imported aggregate and 100% less material sent to landfill.

The Challenge

  • Approximately 3,000m3 of material was being excavated for deep adoptable drainage works.
  • The excavated material potentially required removal from site and replacement with imported trench fill.
  • Site level changes and working conditions required agile equipment and a practical treatment approach.

The Solution

  • Worked with the client team and Thames Water on a modified soil solution for trench backfill.
  • Analysed and laboratory-tested the site-won material, then designed its modification to achieve a minimum 5% CBR.
  • Used a tractor-mounted WS250 Wirtgen mixer and Streumaster SW 3 AC binder spreader.
  • Treated material alongside the trench before placement and compaction using a machine-mounted padfoot compactor.

The Outcome

  • Delivered a design and treatment package enabling excavated material to be reused as acceptable trench fill.
  • Completed the works within the reported 5-day programme.
  • The case study benefits charts report 50% cost saving, 45% programme reduction and 80% fewer vehicle movements.
  • The benefits charts also report 80% less imported aggregate and 100% less material sent to landfill.

Site Images

Related Case Studies

Wilton Park Piling Platform

Piling Platforms

Wilton Park Piling Platform

A design and build stabilised piling platform at Wilton Park, Beaconsfield, using site-won cut material after demolition to create a piling mat suitable for piling operations across a split-level development site.

View Case Study arrow
Wilton Park Adoptable Road Stabilisation

Adoptable Roads

Wilton Park Adoptable Road Stabilisation

A design and build adoptable road stabilisation package at Wilton Park, Beaconsfield, using site-won material to form the capping and subbase replacement layers for a CBM pavement foundation.

View Case Study arrow
Adoptable Roads Residential Development

Residential Development

Adoptable Roads Residential Development

Ground stabilisation solution for adoptable roads within a residential development, involving bulk fill treatment and 300mm capping layer stabilisation to improve bearing capacity, achieve pavement compliance and support long-term road performance.

View Case Study arrow

Ground Stabilisation Projects

Looking for a similar solution?

Speak to our team about ground stabilisation for roads, platforms, compounds and development sites.

Start a Project arrow
WhatsApp