Soil Dynamic Direct Shear Test Apparatus

-Under constant normal stress (σ ₙ), apply dynamic shear stress (τ) and observe the soil's:
-Dynamic shear stress-strain relationship * * (hysteresis curve).
-Dynamic strength attenuation * * (strength degradation under cyclic loading).
-Accumulation of pore water pressure * * (liquefaction trend of saturated soil).
-Interface friction characteristics (such as soil structure interaction).

(1) Cyclic Direct Shear Test
-Apply periodic shear loads to study the strength changes of soil under repeated shear (such as seismic load simulation).
-Application: Evaluate the liquefaction potential of sand and the cyclic softening behavior of clay.

(2) Dynamic interface shear test**
Study the dynamic friction characteristics of the contact surface between soil and structures (such as pile foundations and lining).

(3) Residual strength test**
-Determine the long-term shear strength of soil through large displacement dynamic shearing (applicable for landslide analysis).

Soil Apparatus Determine The Dynamic Shear Strength,Deformation And Shear Modulus Soil Dynamic Direct Shear Instrument  
Dynamic shear stress (τ d_d) is the peak or effective value of dynamic shear force
The ratio of dynamic shear strain (γ d_d) to shear displacement and specimen height
Dynamic shear modulus (G_d), dynamic shear stress/dynamic shear strain (stiffness index)
Damping ratio (D) Energy dissipation capacity (hysteresis curve calculation)
Pore water pressure ratio (r_u), excess static pore water pressure/normal stress (liquefaction criterion)

Earthquake engineering: Evaluating the degradation of shear strength of soil under seismic loads.
Transportation Engineering: Study the long-term deformation of roadbed soil under vehicle cyclic loads.
Ocean engineering: Analyzing the stability of seabed soil under wave action.
Geological hazards: Study on dynamic friction characteristics of landslide sliding surfaces.

Standard specifications

ASTM D3080 (Static Direct Shear Test, Partial Dynamic Expansion).

ISO 17892-10 (International Standard for Soil Testing).

1. Soil sample size: φ 61.8mm × 20mm Other specifications available for selection
2. Vertical pressurization: servo pneumatic
3. Vertical loading range: 0-10KN; Adjust the constant load according to the required sample area
4. Vertical deformation: 0-10mm accuracy 0.01mm
5. Horizontal shear load: 5KN; Select according to the required sample area
6. Instrument composition: servo electric cylinder, shearing device, dynamic control acquisition instrument, computer software, etc.
7. Servo electric cylinder: stroke 50mm
3. Stress Control: Dynamic Shear Stress Control 0-5kN Accuracy ± 2N Other specifications available for selection; Constant stress control, loading waveform (sine wave), and collection of dynamic shear deformation.
4. Strain control: 0.1-5mm/min to control the loading waveform (sine wave)
5. Vibration frequency: 0-10Hz can be set arbitrarily
6. Amplitude: 0.08-1.5mm
7. The dynamic shear segment, frequency, and waveform can be set to 13 continuous vibration segments.
8. Shear deformation: 0-15mm ± 0.001mm
9. Gas source: 0.8MPa
10. Computer control method: Servo electric control for horizontal stress deformation (constant force, constant strain), with adjustable dynamic shear force amplitude. Real time display of records, storage, drawing of graphics, and export of data for analysis and calculation.
11.Shutdown conditions: duration, strain, deformation settings, collection frequency can be set arbitrarily from 2 milliseconds to 1000 milliseconds.