Soil Bentonite gradient permeability consolidation tester
PRoduct description
The bentonite gradient permeability consolidation tester is a specialized experimental device used to study the consolidation permeability coupling characteristics of bentonite (such as sodium based bentonite, calcium based bentonite) or other low-permeability soils under gradient permeability conditions. This Soil Bentonite consolidation tester simulates the hydraulic mechanical behavior of bentonite as an anti-seepage barrier in practical engineering, such as landfill liners and nuclear waste disposal buffer materials, to determine its permeability coefficient, consolidation deformation characteristics, and long-term stability.
Working principle
1. Sample preparation
-Bentonite is compacted into samples according to the predetermined dry density and moisture content, or pre compacted bentonite blocks/pieces are directly used.
-Sample saturation (may require vacuuming or prolonged soaking).
2. Equal gradient infiltration loading
-Apply the same confining pressure at both ends of the specimen (simulating in-situ stress), and then apply a constant head difference through an upper and lower infiltration system to ensure uniform distribution of hydraulic gradient.
-For unsaturated tests, the intake value can be controlled (such as using high intake value ceramic plates).
3. Parameter determination
Permeability coefficient (k: calculated based on Darcy's law using steady-state flow rate and hydraulic gradient.
Consolidation coefficient (Cv: obtained by fitting the deformation time curve.
Expansion/compression characteristics: Analyze the relationship between axial deformation and osmotic pressure.
Technical Parameter
2. Power: 2kW
3. Adopting servo pneumatic valve control (optional air pump)
4. Large axial loading: 0-10KN (adjustable constant) Step by step loading sequence: 200 kPa; 400 kPa； 800 kPa； 1600 kPa； 2000 kPa； 3200kPa
5. Standard sample size: ￠ 61.8mm × 20mm;
6. Counter pressure: 1000kPa ± 0.01kPa, adjustable (constant)
7. Pore pressure: 0-1MPa ± 0.01kPa, adjustable
8. Axial displacement: 0-15mm ± 0.001mm
9. Real time display of displacement and pore pressure on LCD. Reverse pressure and axial pressure are read by high-precision gauges (sensors can also be selected for display)
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