Geosynthetics Direct Shear & Pullout Friction Testing Machine
The Geosynthetics Direct Shear & Pullout Friction Testing Machine is an integrated hydraulic testing system designed to determine the direct shear friction and pullout friction characteristics of geosynthetic materials.
The system applies normal load hydraulically and controls shear/pullout speed digitally, combining both test functions into one machine for higher efficiency and improved pressure accuracy.
Application
This system is suitable for:
(1) Direct shear friction testing of geosynthetics
(2) Pullout friction testing of geosynthetics
(3) Interface friction research between soil and geosynthetic materials
(4) Geotechnical laboratory testing
(5) Highway, railway, hydraulic and civil engineering research
Standards
Direct Shear Friction Test:
(1) ISO 12957-1
(2) GB/T 17635.1
(3) JTG E50 T1129
(4) SL/T 235
Pullout Friction Test:
(1) JTG E50 T1130
(2) SL/T 235
Technical Specifications
| Item | Model 1 | Model 2 | Model 3 |
|---|---|---|---|
| Upper Shear Box | 300×300×200 mm | 600×400×300 mm | 600×400×300 mm |
| Lower Shear Box | 300×300×200 mm | 800×400×300 mm | 800×400×300 mm |
| Pullout Box | 300×300×340 mm | 600×400×500 mm | 600×400×500 mm |
| Loading Method | Servo Electric Cylinder | Hydraulic | Hydraulic |
| Normal Pressure | 0–250 kPa | 50–300 kPa (customizable) | Static: 50–400 kPa / Dynamic: 50–300 kPa |
| Horizontal Drive | Servo Electric Cylinder | Servo Motor | Hydraulic Drive |
| Horizontal Force | 30 kN | 50 kN | 100 kN |
| Horizontal Load Accuracy | 0.50% | ||
| Shear/Pullout Speed | 0.1–10 mm/min | 0.1–10 mm/min | 0.3–10 mm/min |
| Shear Displacement | 0–100 mm | ||
| Pullout Displacement | 0–150 mm | ||
| Displacement Resolution | 0.01 mm | ||
| Return Speed | 1–50 mm/min |
Features
(1) Integrated direct shear and pullout functions; switching requires only minimal fixture replacement
(2) PC upper-computer software control with integrated shear and pullout interface testing
(3) Supports domestic and international standard test condition settings
(4) Full digital closed-loop servo control for stable and precise horizontal loading
(5) Hydraulic or electric normal loading system for stable and accurate pressure control
(6) Quick pin-connection fixture replacement system
(7) Multiple safety protections including overload and over-travel safeguards
(8) Full data export capability for analyzing shear stress, displacement, and time relationships
FAQ
(1) What is this machine used for?
It is used to determine the interface friction characteristics of geosynthetics through direct shear and pullout tests.
(2) Can one machine perform both tests?
Yes. It integrates both direct shear and pullout functions in one system.
(3) How is the normal load applied?
The normal load is applied hydraulically or via electric cylinder depending on the model.
(4) Is the test speed adjustable?
Yes. The shear and pullout speed can be digitally adjusted within the specified range.
(5) What industries use this equipment?
Geotechnical laboratories, research institutes, transportation engineering sectors, and hydraulic engineering institutions.
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