Rock Variable Angle Shear Test

The rock variable angle shear testing machine, designed according to GB/T 23561-2010 and TB10115-2014, can measure not only the variable angle shear strength of rock but also the uniaxial compressive strength, tensile strength (Brazilian splitting method), and shear strength of coal and rock. The device includes fixtures for compression, tensile strength testing (Brazilian splitting method), and variable angle shear. It is capable of performing pressure tests on coal and rock, as well as uniaxial compressive strength tests, Brazilian splitting tests, and shear tests. It can automatically collect test data and calculate parameters such as uniaxial compressive strength, tensile strength, and shear strength of rock. The hardware and software systems of the entire setup comply with the relevant provisions and recommended methods of GB/T 23561.11-2010 for determining the physical and mechanical properties of coal and rock.

The variable angle fixture is designed and manufactured according to GB/T23561.11-2010. This fixture allows adjustment to fifteen angles (α): 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, and 70°, within the range of 0°-70°. By simply replacing the rotating plate, the fixture can be used for both cube specimens of 50×50×50(mm) and cylindrical specimens of 50mm diameter and 50mm length, meeting variable angle shear test requirements. The fixture includes 41 rollers with a diameter of 3mm.
Uniaxial compressive strength test: The rock specimen is placed between the upper and lower plates of a compression machine and loaded until failure, measuring the compressive strength at the point of failure.
Coal and Rock Shear Strength Test: The maximum shear stress that a cross-section of a coal or rock sample can withstand under a given normal stress.
According to GB/T 23561, the calculation method for normal stress δ and shear stress T on the shear failure plane AB is:
δ=（P/F）*cos a
T=(P/F)*sin a
δ Normal stress in megapascals
T Shear stress in MPa
P Shear failure load of the specimen, in Newtons (N)
F Shear area in square millimeters (mm²)
a The angle between the shear plane and the horizontal plane, in degrees (°)

Rock Variable Angle Shear Testing MachineProduct specifications:
1. Test force: 1000 kN;
2. Test force range: 0–1000 kN;
3. Overall stiffness of the test frame: not less than;
4. Measurement relative error: overall not exceeding 1%, with load measurement error not exceeding 0.5% and displacement measurement error not exceeding 0.25%;
5. Pressure plate spacing: not less than 300mm;
6. The pressure plate spacing is adjusted electrically.
7. Column spacing: not less than 300mm;
8. Pressure plate size: not less than Φ200mm;
9. Piston stroke: not less than 200mm;
10. Die material: High-hardness premium cemented carbide;
11. Rated voltage: 220V;
12. The loading speed and/or displacement speed can be automatically controlled via a servo mechanism.
13. Safety Protection: Automatically shuts down when exceeding 2% of the measurement range. Features mechanical limit protection, overload protection, overcurrent protection, and leakage protection. A transparent protective cover is provided for the test.