Manual Rock Direct Shear Tester

The Manual Rock Direct Shear Tester (CT-DSM) applies a normal load across a rock discontinuity and shears the two halves of the specimen to measure peak and residual shear strength and friction angle. The test follows the ISRM suggested method and ASTM D5607. It is the manually operated member of the Coretest direct shear family, which also includes an automated tester and a high-capacity automated model.

How it works

The specimen is encapsulated in the two halves of the shear box so that the joint or plane of interest lies at the shear plane. The box is set in a stiff load reaction frame. The operator applies the normal load and then advances shear displacement by hand while the normal load is maintained. The controlled variables are normal load and shear displacement.

Normal load, shear load, shear displacement and normal displacement are measured during the test. The system reports peak shear strength, residual shear strength and friction angle. The standard frame has 50 kN normal load capacity and 100 kN shear load capacity, with 25 mm of normal and 25 mm of shear displacement. The sample rig takes 150 mm diameter, 150 mm high specimens. The unit weighs 250 kg and runs on 110-220 VAC, 50/60 Hz. Specimen encapsulation and box size are configured per project.

What is included

• Stiff load reaction frame with normal and shear loading
• Shear box for 150 mm diameter, 150 mm high specimens
• Normal and shear load measurement; normal and shear displacement measurement
• Manual shear advance

Specify for your project

• Specimen size and shear box size
• Encapsulation method for irregular or cored samples
• Normal and shear load capacity required
• Readout of load and displacement: stated in the project datasheet
• Supply voltage, 110 or 220 VAC

This description defines the product family. Guaranteed performance, included hardware, exclusions, interfaces and acceptance criteria are stated only in the project-specific technical proposal and approved datasheet.

Features

• Standard: ASTM D5607, ISRM
• Normal load capacity : 50 kN
• Shear load capacity: 100 kN
• Max. normal displacement : 25 mm
• Max. shear displacement : 25 mm
• Sample rig diameter : 150 mm
• Sample height: 150 mm
• Weigh: 250 kg
• Power supply: 110-220VAC, 50/60Hz

Benefits

• ASTM compliant
• Cost effective solution
• Stiff load reaction frame