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Automatic Triaxial Test Soil Laboratory Equipment

The ASTM and BS standards model can be tailor made.

Soil Triaxial Test is an experimental device used to determine soil mechanical properties, widely used in the fields of geotechnical engineering, geological engineering, and civil engineering. Strain Triaxial Tester is mainly used to simulate the mechanical behavior of soil under different stress states, evaluate the strength, deformation characteristics, and stress-strain relationship of soil.

Features: The hydraulic system for confining pressure and backpressure control adopts a "precision digital piston", which can not only apply confining pressure and backpressure, but also measure body deformation and drainage, with a resolution of 1mm3 (cubic millimeters). Even if backpressure is applied, there is no need for measuring tubes and body deformation tubes, no need for drainage and body deformation sensors, no need for manual reading and recording operations. The pipeline adopts quick couplings, the container automatically injects water, and the drainage device is easy to operate. It can produce various outputs such as constant pressure and constant rate, cyclic pressure and volume changes, linear changes over time, etc. as required.

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    product details

    Product Specifications

    Model Number C001
    Surrounding pressure 0-2MPa ± 0.1kPa LCD display computer control
    axial compressive force 0-10KN 0-30KN 0-60KN 0-100KNoptional
    axial deformation 0-20mm±0.01mm
    Strain rate 0.001-4.5mm/min with stepless speed regulation and adjustable settings
    specimen size 39.1mm 61.8mm 101mmConfining pressure cylinder Optional
    Stress rate 10N~30KN/S, adjustable arbitrarily
    Power supply 220V 50Hz
    Product name automatic triaxial apparatus
     Lifting stroke 0-60mm
    Counter pressure, pore pressure, saturation pressure 0-2MPa ± 0.1kPa LCD display computer control
    Control system Windows data acquisition and processing software, supports networking, compatible with existing computer systems, the entire machine does not require an additional data acquisition system, with fully automatic computer control, software acquisition and data processing, and the ability to export data and graphics.

    Product Advantages

    High precision: accurately control stress state and measure deformation.

    simultaneously test soil strain and stress, multi-path, and achieving uniform pressure

    Multifunctionality: Supports multiple testing modes and is suitable for different types of soil.

    Simulate real conditions: able to simulate the stress and strain state of soil in actual engineering

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    Product description

    This triaxial Soil Test device can achieve a method for measuring the shear strength of soil. It usually uses 3-4 cylindrical specimens, which are subjected to different constant surrounding pressures (i.e. small principal stress σ 3) to shear until failure (i.e. stress difference (σ 1- σ 3)). Then, according to the Mohr Coulomb theory, the shear strength parameters, triaxial creep, triaxial permeability, lateral compression coefficient, unconfined compression strength test, and strain controlled loading consolidation test are obtained.

    Determine the total shear strength parameters and effective shear strength parameters of fine-grained soil and sandy soil, and divide them into three types of tests based on different drainage conditions: unconsolidated undrained shear (UU), consolidated undrained shear (CU or UU), and consolidated drained shear (CD) (pore water pressure dissipation test), and (multi-stage loading triaxial compression of one specimen).

    The pressure chamber can be equipped with built-in or external sensors (built-in sensors reduce frictional resistance and are not affected by confining pressure)

    Optional functions

    1. Machine coefficient, automatic control of surrounding pressure during shearing process, and can also obtain the initial tangent modulus and tangent modulus of any segment within the strain range. 

    2. The shear modulus remains constant at (σ 1+2 σ 3)/3 throughout the experimental shear process. 

    3. Elastic modulus, automatic control of axial repeated loading, unloading, and control error ± 1KPa, using real-time cyclic control technology to automatically correct axial deformation errors during the pressure and unloading conversion process of the pressure machine. 

    4. Soil triaxial Testing can also be used for various special tests such as flow penetration tests.

    UU

    The unconsolidated undrained (UU) test does not allow the specimen to drain during the process of applying surrounding pressure and increasing axial pressure until failure occurs.

    Consolidation undrained (CU or UU) refers to the process of first draining and consolidating a specimen under a certain surrounding pressure, and then increasing axial pressure until failure while maintaining undrained conditions.

    CU
    CD

    Consolidation drainage (CD) is the process of draining and consolidating a specimen under a certain surrounding pressure, and then increasing the axial pressure until the specimen is fully drained and fails.

    Cylindrical specimens generate pore water pressure dissipation coefficient, dissipation percentage, and pore pressure coefficient under ambient pressure or axial pressure under K0 conditions (applicable to intact cohesive soils with saturation greater than 85% and compacted cohesive soils with moisture content greater than. optimal moisture content).

    K0-conditions

    The important components of a stress-strain triaxial apparatus include a controller, software, sensors, confining pressure system, back pressure system, pore pressure system, and host accessories

    FAQ（Frequently Asked Questions）

    Q1: What standard tests does this fully automatic three-axis system support? Can stress and strain path tests be conducted?

    A: Our system fully meets the mainstream geotechnical engineering testing standards at home and abroad (such as ASTM D2850, ASTM D4767, ASTM D7181, BS 1377-6, as well as the Chinese national standard GB/T 50123-2019 "Soil Test Method Standard").
    Basic test: Fully automated conventional triaxial test, including unconsolidated undrained shear (UU), consolidated undrained shear (CU), and consolidated drained shear (CD).
    Advanced features: The system supports isotropic consolidation and anisotropic consolidation (K0 consolidation), and has the ability to perform complex stress path tests (such as shear and excavation simulations under specific stress paths).

    Q2: How is fully automatic control achieved? How to ensure control accuracy under high and low confining pressures?

    A: The system adopts closed-loop servo control technology, and the axial loading and pressure control are completely linked by computer software, without the need for manual adjustment of the pressure reducing valve
    Axial loading: Driven by high-precision servo motors (non pneumatic), the loading speed range is extremely wide (such as continuously adjustable from extremely slow consolidation drainage shear of 0.0001mm/min to fast shear of 9.9999 mm/min), and the control is smooth without jumping.
    Pressure control (confining pressure/back pressure): Advanced hydraulic servo digital pressure volume controller (Controller) is used, with a pressure control accuracy of ± 1kPa or ± 0.1% over full range. Whether it is low confining pressure of soft soil at $100 kPa or high confining pressure above $1 MPa, high linearity and extremely low drift can be achieved.

    Q3: Are the measurements of volume change and pore water pressure accurate in CU and CD tests?

    A: Body deformation and pore pressure are the core data for determining soil characteristics. We provide dual guarantees through software and hardware: body deformation measurement uses a high-resolution digital volume transmitter (volume controller) with a resolution of up to 0.001ml, which can accurately capture the small body deformation of soil samples during drainage shear (CD) process.
    Pore pressure measurement: Imported high-precision and low hysteresis pore water pressure sensors are used, directly installed on the three-axis base to minimize pipeline delay and ensure absolute and real-time pore pressure response during consolidation and shear processes.

    Q4: Triaxial testing often lasts for several days or even weeks. How can the system ensure its sealing performance under long-term operation?

    A: Long term testing (especially CD testing) requires almost strict sealing requirements for the system. We have made a special design to address this pain point:
    Low friction and low leakage shaft seal: The axial loading rod passes through the top cover of the pressure chamber and uses a special combination of low friction and low leakage sealing rings, which not only ensures minimal friction when the loading rod moves up and down (without affecting low stress testing), but also ensures that the surrounding pressure does not leak out under long-term high pressure.
    Anti corrosion valve pipeline: The pipelines, quick change joints, and valves that come into contact with water are all made of stainless steel or high pressure resistant polytetrafluoroethylene (PTFE) material to prevent rust and local leakage after long-term use.

    Q5: Is the software operation complicated? Will data be lost if there is a power outage or computer crash during the experiment?

    A: Our software is developed with the concept of "professional functionality, guided operation":
    Process oriented guide: The software has built-in standard processes for saturation, consolidation, and shear. Users only need to input the soil sample size and target parameters, and the software will automatically determine the saturation (B-value detection), automatically determine the termination of consolidation, and automatically switch to the shearing stage.
    Power outage data protection: The lower computer (controller) has independent data buffering and hardware protection mechanisms. Even if the computer suddenly crashes or loses power, the controller will safely stop loading and retain the key node data of the current experiment. After restarting, you can choose to "continue the experiment", never letting days of trial effort go to waste.

    Q6: How is the equipment compatible with soil samples of different sizes (such as soft soil and large particle gravel soil)?

    A: Our pressure chamber adopts a modular and replaceable base design.
    If you want to make both 39.1mm standard fine-grained soil and 101mm coarse-grained soil on a single host, you only need to purchase the corresponding size of pressure chamber top base components (base, pressure head, split mold). The main controller and loading frame are completely interchangeable, greatly saving procurement costs.