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Backfill Reinforcement

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What is Backfill Reinforcement?

Backfill reinforcement strengthens soils behind retaining walls, utilities, embankments, and other structures where soil support is critical. Using trenchless polymer injection, weak backfill is densified, stabilized, and reinforced to restore long-term reliability.

Problems Solved

  • Settlement behind retaining walls, abutments, or structures
  • Soil erosion causing voids and instability in backfill zones
  • Cracking or displacement from poorly compacted soils
  • Groundwater infiltration weakening backfill and subgrades
  • Risk of collapse or loss of support in adjacent assets

Types of Polymers Used

High-Density Polyurethane Foams

  • Expands to densify and stabilize loose backfill soils
  • Provides lightweight reinforcement without added soil pressure
  • Cures rapidly to minimize operational disruption

Structural Polyurethane Resins

  • Creates rigid reinforcement zones behind walls and utilities
  • Transfers structural loads to stable ground layers
  • Extends service life of supported structures

Hydro-Insensitive Polymers

  • Expands and cures in wet or groundwater conditions
  • Seals voids and prevents erosion in saturated soils
  • Provides long-term durability in challenging sites
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Benefits of Backfill Reinforcement

Backfill reinforcement protects infrastructure by stabilizing weak soils, eliminating voids, and preventing settlement. The trenchless process extends the service life of supported structures with minimal disruption.

Restore Stability to Critical Backfill Zones

  • Strengthens backfill soils behind walls and utilities
  • Prevents settlement and soil loss from erosion
  • Provides durable reinforcement without excavation
  • Extends service life of supported infrastructure

Key Applications

Retaining Walls

Stabilizes soils and prevents movement or wall failure

Bridge Abutments

Reinforces backfill supporting approach structures

Utility Trenches

Prevents soil loss and voids around buried utilities

Rail & Road Embankments

Restores stability in transportation corridors

Flood & Levee Systems

Seals voids and stabilizes backfill in water-control structures

Commercial & Industrial Sites

Protects foundations and pavements near filled areas

Services

Backfill reinforcement supports and enhances these services:

Soil Stabilization

Soil Stabilization

Improves strength and reliability of weak backfill soils

Settlement Mitigation

Settlement Mitigation

Corrects differential movement behind structures

Void Filling

Void Filling

Eliminates cavities forming in or behind backfill zones

Retaining Wall Stabilization

Retaining Wall Stabilization

Reinforces soils supporting walls and abutments

Structural Reinforcement

Structural Reinforcement

Restores load transfer and long-term performance

Deep Injection (UDI)

Deep Injection (UDI)

Compacts and stabilizes deep foundation soils to enhance support beneath reinforced backfill zones

How Our Process Works

1

Investigation

Backfill zones inspected for voids, settlement, or instability

2

Planning

Injection grid and polymer selection designed for site needs

3

Access

Small-diameter injection points installed with minimal disruption

4

Injection

Expanding polymers densify and stabilize soils behind structures

5

Monitoring

Real-time tracking ensures effective reinforcement coverage

6

Validation

Final inspection confirms restored stability and performance

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