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Rigid Inclusions transfer loads to stable layers for greater strength, lower cost, reduced load transfer requirements, and shorter construction time.

Why Use Rigid Inclusions?

When Rammed Aggregate Pier elements cannot adequately control settlement in soft or loose soils, and there is a stiffer soil layer below the soft/loose soils, the use of Rigid Inclusions can typically solve the problem. Rigid inclusions are frequently used for soil stabilization when a load is being transferred through very soft soils to stiffer soil or rock, increasing load-carrying capacity and reducing compressibility of the poor soils. Rigid inclusions are often used to support an embankment or building over compressible soils, ultimately supported by a hard layer.

What are Rigid Inclusions?

Rigid inclusions consist of cement-treated aggregate, grouted aggregate, grout mixed with soil, or concreted columns that are used to transfer the stress from the foundation or embankment loads through very soft soils down to stiffer soil or rock layers. While Rigid inclusions can be used as a singular solution for a project, they can also be used in combination with conventional rammed aggregate pier ground improvement methods to optimize both performance and project cost. Rigid Inclusion technologies include: Grouted Rammed Aggregate Pier System, Precision Grouted Rammed Aggregate Pier (RAPs), and GeoConcrete.

How are Rigid Inclusions Built?

Hollow mandrel method

To create rigid inclusions, a hollow mandrel is used to penetrate the ground and displace weak soils laterally.  Either grout, grouted stone, or concrete is extruded from the end of the mandrel, or from multiple ports within the hollow mandrel. As the mandrel is gradually lifted, it leaves behind a rigid inclusion column of controlled stiffness.

Drill method

To create rigid- inclusions, a hollow, dual flight auger is lowered from a crane as it spins.  Grout is then gradually added as the auger spins in reverse from the bottom of the cavity to the top of it, leaving behind a mixture of grout and soil to create a rigid inclusion. Factors driving the design of all rigid-inclusion systems include the following considerations: poor soil depth, the geotechnical capacity of stiff soil at depth, the structural capacity of the Rigid inclusion, and the structural loads being applied.

Types of Rigid Inclusions Available

Grouted Rammed Aggregate Pier Systems
Precision Grouted Rammed Aggregate Piers
GeoConcrete Columns
Drilled Displacement Columns
Armorpact (Confined Rammed Aggregate Piers)

Rigid Inclusion Applications

  • Isolating Stress from Heavily Loaded Footings
  • Supporting Heavily Loaded Mats and Slabs
  • Embankment or Wall Support in Very Poor Soil
  • Ground Improvement for Thick Organic and Peat Layers
  • Providing Foundation Support Adjacent to Below-Grade Structures
  • High Capacity, Engineered Approach where Rammed Aggregate Alone will not Suffice.

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Rigid Inclusion Delivery by GeoSolv

GeoSolv works with the site project team to design an appropriate rigid inclusion solution for your project.  Our unique turnkey design/build delivery process provides a sound solution to all problem soils.  Full-time quality control with a certified Quality Control Technician (not a computer, or operator), along with full- scale load testing, provides additional quality assurance.  Detailed, on-site reviews by a GeoSolv Design Engineer ensures that the installation is being completed according to the exact design specifications. A standard peer review by Geopier Foundation Company at every stage of your project provides an unparalleled guarantee that the system is optimized to the specific soil problem. Upon conclusion of the project, GeoSolv Engineers sign off on the solution, backed by error & omissions insurance documentation, further ensuring that our high-quality standards are met.

How Can You Do More with GeoSolv Rigid Inclusions than Other Rigid Inclusions?

GeoSolv’s Rigid Inclusion Systems always involve sizeable vertical crowd force, vertical ramming energy and significant lateral stress increase. This action, along with the vertical ramming and heavy crowd pressure with lateral cavity expansion, is unique to GeoSolv, and creates unsurpassed system performance.  These three factors are essential as they result in a more highly engineered system with improved performance over other rigid-inclusion approaches.

How Do I Know Which Rigid Inclusion to Use for My Project?

We are here to find the right solution to your soil problem. Contact us for a free review of your project details and an obligation-free proposal or feasibility study.

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