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Soil-Confined Geosynthetic Transmissivity Tester

Soil-Confined Geosynthetic Transmissivity Tester
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In-Plane Water Flow Rate Tester
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Soil-Confined Geosynthetic Transmissivity Tester - QualiGTX™ IPF S

QualiGTX™ IPF S Soil-Confined Transmissivity Tester measures the in-plane flow capacity of drainage geocomposites, geonets, and drainage boards while the specimen sits buried between compacted soil layers rather than clamped between rigid steel platens. Qualitest supplies the IPF S to geotechnical laboratories, landfill designers, and transportation engineers who need drainage numbers that reflect installed conditions rather than an index value. The instrument houses an 800 × 500 × 650 mm test box that carries soil above and below a 450 mm flow length of drainage material. Water enters upstream, travels the length of the confined specimen, and discharges for measurement.

Soil confinement changes the answer, often dramatically. A geotextile pressed against a drainage core by real soil deflects into the core apertures and narrows the channels that carry water, a mechanism that rigid-platen testing never reproduces. Laboratories that only test between steel plates report flow capacities well above what the same product delivers in the ground.

Design teams use the IPF S to build defensible reduction factors instead of borrowing generic values from literature. Filling the box with the actual subgrade, backfill, or cover soil planned for the project produces a flow capacity tied to that job rather than a catalog figure. Contractors and owners get a number that survives review.

Soil-Confined Geosynthetic Transmissivity Tester - QualiGTX™ IPF S Applications

The QualiGTX™ IPF S serves projects where a drainage geosynthetic will be buried in soil and the design has to account for what that soil does to flow capacity.

  • Landfill Cap and Cover Drainage: beneath a compacted cover soil profile built in the test box
  • Railway Subgrade and Trackbed Drainage: reproduces the ballast and subgrade contact that governs drainage performance beneath track structures
  • Highway Embankment and Subsurface Drainage: tests edge drains and blanket drainage layers confined by the fill materials specified for the alignment
  • Retaining Wall and Reinforced Soil Backfill: evaluates drainage elements sandwiched between structural backfill where pore pressure relief controls stability
  • Green Roof and Podium Deck Systems: assesses drainage mats loaded by growing medium rather than by a rigid plate
  • Geotechnical Design Verification: generates project-specific intrusion reduction factors for drainage layer sizing calculations
  • Drainage Geocomposite Product Development: compares core geometry and geotextile stiffness under the soil contact conditions that determine field performance
  • Mining and Heap Leach Pad Engineering: characterizes solution collection layers confined by ore and drainage aggregate
  • Agricultural and Land Drainage: tests subsurface drainage products installed under cultivated soil profiles
  • Research and Academic Laboratories: supports studies of soil intrusion, long-term creep, and the gap between index and performance flow values
Soil-Confined Geosynthetic Transmissivity Tester

Soil-Confined Geosynthetic Transmissivity Tester - QualiGTX™ IPF S Key Features

The QualiGTX™ IPF S is built around one purpose: reproducing the soil contact that governs how a drainage geosynthetic actually performs once buried.

  • Soil-Confined Test Chamber: holds compacted soil above and below the specimen so the measured flow reflects service conditions instead of a rigid-platen idealization
  • Large 800 × 500 × 650 mm Test Box: accommodates realistic soil layer thickness on both faces, avoiding the boundary artifacts that shallow chambers introduce
  • 450 mm Specimen Flow Length: gives a long enough flow path for steady-state conditions to develop and for edge effects to stay a small share of the result
  • Project-Specific Soil Configuration: accepts the actual subgrade, backfill, or cover soil planned for the job, producing reduction factors tied to that project
  • Performance-Test Boundary Conditions: supports the confined test arrangement that design reviewers increasingly expect alongside index data
  • Rigid Floor-Standing Frame: carries the mass of a fully loaded soil box without deflection that would disturb the flow geometry
  • Self-Contained Cabinet Layout: fits the chamber, flow path, and collection arrangement into a 1040 × 660 × 1200 mm footprint for a standard laboratory bay

Theory and Method

In-plane flow testing comes in two forms. An index test clamps the specimen between rigid platens and produces a repeatable number for comparing products. A performance test replaces those platens with the materials that will actually touch the drainage layer in service, which changes the boundary condition and therefore the result. The IPF S runs the second form, holding the specimen between compacted soil layers inside its test chamber.

Intrusion drives the difference. Soil pressing on a geotextile forces it to deflect into the open apertures of the drainage core beneath, shrinking the cross section available to water. Fine particles work into the flow channels at the same time. Core thickness and open area both drop, so measured flow capacity under soil can fall to a fraction of the rigid-platen value for the same product. Designers account for this with intrusion reduction factors applied to catalog transmissivity.

Test execution follows the constant-head approach. The operator builds the soil profile in the 800 × 500 × 650 mm box, seats a 450 mm flow length of drainage material within it, and compacts the cover soil to the target density. Water introduced at the upstream boundary travels the confined flow path and discharges downstream, where the operator collects the volume over a timed interval once flow reaches steady state.

Soil-Confined Geosynthetic Transmissivity Tester - QualiGTX™ IPF S Technical Specifications

ParameterSpecification
Specimen Length450 mm
Test Box Dimensions800 × 500 × 650 mm (L × W × H)
Test ConfigurationSoil-confined, specimen buried between compacted soil layers
Head ConditionConstant head
Measured PropertiesSoil-confined in-plane water flow capacity, flow rate per unit width
Overall Dimensions1040 × 660 × 1200 mm (W × D × H)
Weight220 kg

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In-Plane Water Flow Rate Tester