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Geotechnical true triaxial testing system

Geotechnical true triaxial testing system

Model: UT1072E, ASTM D3999, ASTM D5311

Geotechnical Triaxial Test Equipment is designed for accurate laboratory evaluation of soil and rock behavior under controlled confining pressure. It is widely used to determine shear strength, stiffness, and stress-strain response for geotechnical and structural design. Modern systems are commonly built with closed-loop control, expandable data acquisition, and modular configurations so laboratories can move from standard tests to advanced procedures on the same platform.

Our Biaxial & Triaxial Testing Machines are available as part of advanced geotechnical testing solutions, supporting a broader range of stress condition simulations for specialized research and material behavior analysis.

General introduction

Geotechnical true triaxial testing system, rock triaxial testing machine, also known as the rock triaxial direct shear composite testing machine, is a specialized testing equipment used to study the mechanical properties of rocks under complex stress states. It is widely used in the fields of geological engineering, mining, and civil engineering. This equipment is driven by a microcomputer-controlled electro-hydraulic servo system and is equipped with high-precision measuring and control devices, allowing for multi-channel coordinated loading to achieve triaxial compression, direct shear tests, creep testing, and pore permeability analysis.


Its core functions include simulating the mechanical response of rocks under confining pressure (0-40MPa), temperature control, and dynamic loading conditions, supporting full digital control of multiple parameters such as axial pressure (up to 600kN) and deformation range (±100mm) for φ50×100mm standard samples. The device features a modular pressure chamber design, real-time display of axial/radial stress-strain curves, automatic data acquisition, and safety protection mechanisms. Some models integrate acoustic emission detection and magnetostrictive deformation measurement technology. Through a closed-loop control system, it can accurately restore the in-situ stress environment of deep rock layers, providing critical data support for engineering design and geological disaster prevention.


Geotechnical true triaxial testing system

  • Key Features
  • Applications
  • Advantages

·   Supports a wide range of triaxial procedures, including UU, CU, CD, UC, stress path, permeability, and unsaturated soil testing.

·   Suitable for both conventional and advanced soil testing, with dynamic options for liquefaction, resilient modulus, and cyclic strength analysis.

·   Modular system architecture makes it easy to combine load frames, triaxial cells, pressure/volume control, and software into one laboratory workflow.

·   Designed for reliable, repeatable, and efficient testing in geotechnical laboratories that need stable performance and clear data output. 

UnitedTest Geotechnical Triaxial Test Equipment is widely used in:

·   Geotechnical engineering laboratories

·   Soil mechanics and foundation research institutes

·   Civil engineering design and construction testing

·   Transportation and infrastructure projects

·   Academic and scientific research in geotechnical fields

It is a strong fit for teams that need repeatable test results for project evaluation, material comparison, and laboratory quality control. 


  • ·   Stable and reliable loading system for long-duration testing

  • ·   High-resolution data acquisition for accurate geotechnical analysis

  • ·   Compatible with advanced research and standard laboratory testing

  • ·   Reduced human error through automated or semi-automated operation

  • ·   Designed for repeatable and standardized soil mechanics testing procedures


Main technical specification

Loading Capacity(kN)  Compression  100/200/300/500 KN;  Tension Test 50/200/150/200 KN
Displacement Measurement Range  0-100mm
Deformation Measurement Range 0-20mm
Sample Specifications (mm)  40x40x80, 50x50x100, 100x100x100, 100x100x150

FAQ – Geotechnical Triaxial Test Equipment

1. What is Geotechnical Triaxial Test Equipment used for?

Geotechnical Triaxial Test Equipment is used to analyze the mechanical behavior of soil and rock under controlled confining pressure. It helps determine shear strength, deformation characteristics, and stress-strain relationships, which are essential for foundation design, slope stability, and geotechnical engineering projects.


2. What types of triaxial tests can this equipment perform?

The system typically supports a wide range of tests, including UU (Unconsolidated Undrained), CU (Consolidated Undrained), CD (Consolidated Drained), and UC tests. Advanced configurations can also support cyclic triaxial tests, stress path testing, and liquefaction analysis.


3. What materials can be tested with this system?

It is mainly designed for soils such as clay, sand, silt, and gravel. Some configurations can also be adapted for weak rock and granular materials depending on the testing requirements.


4. What industries use triaxial testing equipment?

This equipment is widely used in geotechnical engineering, civil construction, transportation infrastructure, mining, and academic research institutions. It is essential for any application requiring soil strength and stability evaluation.


5. Is the system automated or manual?

Modern geotechnical triaxial systems are typically semi-automated or fully automated. They integrate digital control systems for pressure, volume, and load application, reducing human error and improving test accuracy and repeatability.


6. What makes triaxial testing important in geotechnical engineering?

Triaxial testing provides realistic simulation of in-situ soil stress conditions. It helps engineers understand how soil behaves under different loading scenarios, which is critical for safe and cost-effective structural design.


7. Can the equipment support advanced research applications?

Yes. Advanced configurations can support dynamic and cyclic loading, liquefaction studies, resilient modulus testing, and stress path analysis, making it suitable for both standard laboratory use and research-level geotechnical studies.


8. What standards does the equipment comply with?

Most geotechnical triaxial systems are designed to comply with international testing standards such as ASTM and ISO, ensuring consistent and reliable results for engineering and research applications.

Standard

ASTM D3999 Soil Secant Modulus and Damping Coefficient by Dynamic Cyclic Triaxial Testing

ASTM D3999 applies to both intact and reconstituted soil specimens and focuses on hydrostatically consolidated, undrained conditions. The standard provides two test methods: one using constant cyclic load (Method A) and the other using constant cyclic deformation (Method B). These properties are essential for evaluating soil behavior under dynamic loads such as earthquakes, ocean waves, or blasts, and are used in geotechnical engineering analyses. 

ASTM D5311 Load Control Cyclic Triaxial Strength Test of Soil

ASTM D5311 specifies procedures for evaluating the cyclic response and strength of saturated soils under load-controlled cyclic triaxial testing, primarily to assess liquefaction potential and dynamic behavior under earthquake or other cyclic loading conditions.

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