C019 Soil Dynamic Direct Shear Instrument
Used to determine the dynamic shear strength, deformation, and shear modulus of soil, a specimen is usually used to apply shear force under different vertical pressures to obtain the shear stress at failure; Determine the shear strength coefficient, internal friction angle, and cohesion based on Coulomb's law. According to the required setting of dynamic shear stress frequency and waveform, calculate the shear modulus of dynamic shear deformation for analysis and evaluation. The soil sample should be saturated fine-grained soil or sandy soil, and other coarse-grained soil can also be referred to for implementation The dynamic shear strength (or liquefaction resistance) characteristic test should adopt the consolidated undrained vibration test condition, and the constant dynamic shear stress deformation characteristic test should adopt the consolidated undrained vibration test condition. The dynamic shear residual deformation characteristics test should adopt the consolidation drainage vibration test conditions. The purpose of this experiment is to determine the failure strength (including liquefaction) of saturated soil under dynamic stress, and to analyze and calculate dynamic characteristic indicators such as dynamic shear modulus and damping ratio. technical parameter 1. Soil sample size: φ 61.8mm × 20mm Other specifications optional 2. Vertical pressurization: servo pneumatic 3. Vertical loading range: 0-10KN; According to the required load on the sample area, set it to a constant value at will 4. Vertical deformation: 0-10mm with an accuracy of 0.01mm 5. Horizontal shear load: 5KN; Select according to the required sample area 6. Instrument composition: composed of servo electric cylinder, shear device, dynamic control acquisition instrument, computer software, etc. 7. Servo electric cylinder: stroke 50mm 3. Stress control: Dynamic shear stress control with an accuracy of 0-5kN ± 2N, optional for other specifications; Constant stress control, loading waveform (normal wave), and collecting dynamic shear deformation. 4. Strain control: 0.1-5mm/min to control the loading waveform (Zhengxuan wave) 5. Vibration frequency: 0~10Hz, arbitrarily set 6. Amplitude: 0.08-1.5mm 7. The dynamic shear section, frequency, and waveform can be set to 13 continuous vibrations. 8. Shear deformation: 0-15mm ± 0.001mm 9. Air 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. Shutdown conditions: duration, strain, deformation settings, and collection frequency of 2 millisecond to 1 thousand millisecond can be set arbitrarily.
