Rock Combined Triaxial and Direct Shear Apparatus

The combined modular rock direct shear and triaxial test system is designed to determine the shear strength of intact, joint rock or concrete samples.The frame is a high stiff frame which consists of 4 stiff columns and two actuators for vertical force and shear force, combined in a special configuration to avoid friction and torque to determine the shear strength and creep properties of rock samples, concrete, as well as any solid material.

The device is suitable for cylindrical, prismatic or irregular shaped pieces of solid or discontinuous rock cores. The system uses two independent servo-hydraulic actuators to apply axial and shear load to samples with highest accuracy possible.This device allows for the testing of rock samples under both shear and triaxial loading conditions.

This combination lowers the total cost of the system compared to purchasing two separate devices—one for triaxial tests and the other for direct shear tests.There is no limit for modularity of this system.

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Features
Specifications
Upgrade Options
Software
Standards
Applications

Highly stiff and robust loading frame with a large testing area
Precise force transducers to measure and control shear and normal stress
Hydraulic power packs with high-quality noise protection, as well as emergency functions
The shear boxes consist of a tilting free lower and upper shear frame, which is guided by linear bearings, a fixed upper shear frame and a guided load piston
The triaxial cell is designed for sample sizes up to 100mm in diameter with confining pressure range up to 200MPa and temperature control up to +200 c degree.
High-speed, closed-loop control of load, displacement, position and volume or flow
Possibility to apply different stress paths or strain rates load independent shear rates (shear stress optional) via a micro-processor controlled high-quality servo-valve
Suitable for precise direct shear and triaxial tests on rocks, sliding surfaces and building materials

Load type	servo-hydraulic
Axial force	up to 5000 kN
Shear force	Up to 500 kN
Specimen Size	up to 300×300×300 mm for shear tests Up to 100mm diameter for Triaxial tests
Accuracy	0.1%
Settlement, resolution	50/0.001 mm
Shear displacement	50 mm/100 mm
Cyclic Load	on request

Or customized on request

The combined triaxial/direct shear device is a modular, user-friendly system that can be upgraded with additional hardware to perform a variety of tests, including:

Triaxial Cell: For standard triaxial testing on rock samples.
Permeability Tests: Conduct permeability testing on rock samples using single or double pressure intensifiers, up to 200 MPa, in both steady-state or unsteady-state conditions.
Ultrasonic Velocity Measurement: To measure the velocity of ultrasonic waves through the rock sample.
Acoustic Emission Test (3D): For monitoring and analyzing the acoustic emissions from the rock during testing.
Hydraulic Fracturing Test: To perform hydraulic fracturing on intact specimens.
Creep Test: For assessing the long-term parameters of rock samples under constant load, useful for analyzing the stability of structures such as underground constructions.

GEOsys Software for user defined free programmable test standard procedures and complex test sequences by structured Windows operation on a graphic user interface.

Through a series of menus, this provides quick access to all the controls needed for test set ups and follows standard test sequences.

The software is able to create an unlimited number of test stages with interactive and calculated parameters for closed-loop, real-time control. An unlimited number of control and measuring channels can be simultaneously controlled

ASTM D-5607

Standard Test Method for Performing Laboratory Direct Shear Strength Tests of Rock Specimens Under Constant Normal Force

ASTM D-7012-14

Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures

ASTM D-7070-08

Standard Test Methods for Creep of Rock Core Under Constant Stress and Temperature

JGS 2521-2009

Method for Unconfined Compression Test on Rocks

JGS 2531-2009

Method for Unconsolidated-Undrained Triaxial Compression Test on Rocks

JGS 2532-2009

Method for Consolidated-Undrained Triaxial Compression Test on Soft Rocks