Laboratory Automatic Digital Shear Creep Testing Machine for Soil
Laboratory Automatic Digital Shear Creep Testing Machine for Soil
Working principle
1. Sample preparation
-Fill the soil sample into the shear box according to the predetermined density and moisture content, which may be pre consolidated.
2. Apply normal stress
-Apply constant normal stress through a vertical loading system (simulating soil burial depth pressure).
3. Apply shear stress
-Apply a constant shear stress (lower than the instantaneous shear strength) while keeping the normal stress constant.
4. Monitor creep deformation
-Record the displacement of soil samples over time under shear stress (creep curves are usually divided into three stages: attenuation, stability, and acceleration).
key parameter
Creep curve: a displacement time relationship curve that reflects the rheological properties of soil.
Long term shear strength: Determine the critical creep stress threshold of soil through multi-stage stress tests.
Creep model parameters: Provide fitting data for rheological models such as Burgers and Norton.
Application scenarios
Evaluate the deformation stability of soil under long-term loads (such as fill slopes, retaining walls).
Study the engineering properties of rheological sensitive soils such as frozen soil and soft clay.
Provide soil rheological parameters for numerical simulations such as FLAC and Plaxis.
Test method: ASTM D6467
1. Sample: ￠ 61.8 × 40mm; ￠61.8×20mm
2. Shear force: 1.8KN ± 0.02%
3. Shear deformation: 0-15mm ± 0.01mm
4. Vertical consolidation deformation: 0-10mm ± 0.01mm
5. Loading method: Pneumatic loading
6. Vertical loading: 12.5KPa, 50KPa, 100KPa, 200KPa, 300KPa, 400KPa
7. Cutting speed: 0.01-10mm infinite speed regulation
8. Shear rate: adjustable from 0.01KN/S to 10KN/S
9. Shear control method: stress: 0-5000N constant force (adjustable) for deformation; Strain: 0.001-10mm (adjustable) mining force
10. Creep Testing Machine composition: servo motor, shear force sensor, shear deformation sensor, vertical deformation sensor, vertical pneumatic control pressure regulating constant device, shear sample box, main frame, computer, software
Composition of the data acquisition device.
11. Computers, software, and Windows systems are used throughout the entire testing process to collect and record samples with the same number, including shear creep soil samples, constant shear time, and deformation. Time, deformation length, and stopping of the test can be set.
Digital Shear Creep Testing Machine For Soil
Record and store, export in Excel spreadsheet format for browsing, analysis, and processing.
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