Experimental principle
The automatic Direct Shear Test Apparatus soil sample should be saturated fine-grained soil or sandy soil, and other coarse-grained soils can also be executed accordingly.
The dynamic shear strength (or liquefaction resistance) characteristic test should adopt the consolidation undrained vibration test conditions, and the constant dynamic shear stress deformation characteristic test should adopt the consolidation undrained vibration test conditions.
The residual deformation characteristics test of dynamic shear should adopt the conditions of consolidation drainage vibration test.
The purpose of this experiment is to determine the failure strength (including liquefaction) of saturated soil under dynamic stress, and to provide dynamic characteristic indicators for analyzing and calculating the dynamic shear elastic modulus.
-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).
Main testing modes
(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).
Key output parameters
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)
Application Fields
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).
Technical Parameter
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.
About this supplier
Xi an Zealchon Electronic Technology Co ., Ltd With more than 15 years of civil engineering background, located in new technology industry development zone in Xi'an, an ancient city in China. It covers an area of 7500 square meters of building area. We manufacture and supply testing instruments for civil engineering, geological survey, water conservancy and hydropower, roads and bridges, highways, railways and airports. We specialize in the production and sales of geotechnical testing instruments, asphalt and asphalt mixture testing instruments, cement and concrete testing instruments. Zealchon is engaged in manufacturing and supplying qualitative array of research and laboratory testing equipment. Zealchen specialize in civil engineering research and experimental apparatus; another is the semiconductor laser research and development.Our range includes research lab instruments, soil testing instruments, bitumen testing instruments, and cement& concrete testing equipment.
Packaging & shipping specifications
FAQs
1. Who are we?
We are based in Shaanxi, China, start from 2014, sell to Eastern Asia(30.00%), South Asia(30.00%), Mid East(15.00%), Western Europe(15.00%), Southern Europe(10.00%). There are total about 11-50 people in our office.
2.What can you buy from us?
Bitumen Testing, Material Testing, Aggregate Testing Machine, Soil Testing, Laboratory machine.
3.How can we guarantee quality?
Always a pre-production sample before mass production; Inspection and Calibration: technician do it strictly before shipment.
