Soil Testing Equipments

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nl5052x005-05
nl5052x005-05Direct Shear Machine Software
Standard : ASTM D3080, BS 1377-7, AASHTO T236, NF P094 071-1/2 Direct Shear Testing Machine, Digital A Direct Shear Testing Machine is used to determine the shear strength properties of soil samples by performing the consolidation and shearing phase of a standard direct shear and residual shear te ...Read more

Direct Shear Testing Machine, Digital
NL 5052 X / 005


  • Description

Standard : ASTM D3080, BS 1377-7, AASHTO T236, NF P094 071-1/2

Direct Shear Testing Machine, Digital

A Direct Shear Testing Machine is used to determine the shear strength properties of soil samples by performing the consolidation and shearing phase of a standard direct shear and residual shear test under automatic speed control. The upper compartment holds the soil sample, while the lower one applies a normal stress (vertical load) and allows horizontal displacement to create shear stress. The soil sample is confined within a shear box, which can be either square or circular depending on the test requirements. 

The Direct Shear Machine consists of a micro stepper motor to apply horizontal shear load to the soil specimen, at a user-input shearing rate. The shear force readings are obtained from the proving ring at specified intervals of horizontal displacement shown on the touchscreen display. Incorporated with limit sensors to prevent the shear box from over-traveling at forward or reverse motions.

The control panel comes with an LCD and keypad for manual setting and control, a large liquid crystal display, a 16 keys membrane, reciprocating shear capability, and times settable built-in 16-bit Data acquisition and control.

During the test, a shear force is applied horizontally to the soil sample, causing it to deform. By measuring the applied force and the corresponding displacement, engineers can calculate parameters such as shear strength, cohesion, and internal friction angle, for designing foundations, retaining walls, slopes, and other geotechnical structures.

Technical Specifications

 Model Number  NL 5052 X / 005
 Max. Shear Capacity  5000 N
 Resolution  1 N
 Adjustable Shear Speed  0.00001 to 9.99999 mm/min
 Max. Shear Travel  25 mm
 V.Load Beam Ratio  11:1,10:1,9:1
 Approx. Dimension (LWH)  1300 mm x 400 mm x 1250 mm
 Power Supply  240 V, 1 pH, 50/60 Hz, 0.5 Hp
 Approx. Weight  165 kg

Unit Consists Of:

 NL 5052 X / 005 - P001  60 X 60 mm Complete Shear Box Assemblies Unit
 NL 5052 X / 005 - P002  5kn Load Sensor Unit
 NL 5052 X / 005 - P003  12.7 x 0.001 mm Vertical Linear Potentiometric Displacement Transducer
 NL 5052 X / 005 - P004  25 X 0.001 mm Horizontal Linear Potentiometric Displacement Transducer
 NL 5052 X / 005 - P006  Hollow Punch & Tamper for 60x60 mm specimen
 NL 5044 X / 001 - A001  50 kg Set Of Weight

*1 Copy of Manual Instruction

Optional Accessories:

 NL 5052 X / 005 - A001  100 x 100 mm Complete Shear Box Unit
 NL 5052 X / 005 - A002  Hollow Punch & Tamper for 100 x 100 mm Specimen
 TT 6ST - PBU  Portable Bench Unit
 NL 5052 X / WMS  Compatible Version Laptop with Window Modulus Software.
 Software Featured:-
 1) Save datas, recall saved datas
 2) View live data (with graph)
 3) Calibration & adjustment
 4) Control machine operation using laptop
 5) Input specimen information in details for easy identification.
 6) Shows other info that may not appear on the machine, example stress value, graph, etc

Features of Direct Shear Testing Machine

  • Automatic Speed Control: Allows for precise control of the shearing rate during the test, ensuring consistent and accurate results.
  • Micro Stepper Motor: Used to apply horizontal shear load to the soil specimen at a user-input shearing rate, offering precise control over the testing conditions.
  • Proving Ring: Measures shear force readings at specified intervals of horizontal displacement, providing data for analysis.
  • Limit Sensors: Incorporated to prevent over-traveling of the shear box during forward or reverse motions, ensuring safe operation of the machine.
  • Control Panel: Equipped with an LCD display and keypad for manual setting and control, allowing users to adjust parameters as needed.
  • Reciprocating Shear Capability: This enables the machine to perform both the consolidation and shearing phases of direct shear and residual shear tests.
  • Data Acquisition and Control: A built-in 16-bit system for acquiring and controlling data, offering precise measurement and analysis capabilities.
  • Versatile Applications: Used for determining shear strength properties of soil samples, facilitating the design of foundations, retaining walls, slopes, and other geotechnical structures.

Standards

  • ASTM D3080: This is a standard test method issued by the American Society for Testing and Materials (ASTM) titled "Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions." It provides procedures for conducting direct shear tests on soil specimens to determine their shear strength properties under consolidated drained conditions.
  • BS 1377-7: This is a British Standard issued by the British Standards Institution (BSI) titled "Methods of Test for Soils for Civil Engineering Purposes - Part 7: Shear Strength Tests (Effective Stress)." It specifies methods for conducting shear strength tests on soil samples, including direct shear tests, to determine their engineering properties.
  • AASHTO T236: This is a test method published by the American Association of State Highway and Transportation Officials (AASHTO) titled "Standard Method of Test for Direct Shear Test of Soils Under Consolidated Drained Conditions." Similar to ASTM D3080, it provides procedures for conducting direct shear tests on soil specimens under consolidated drained conditions.
  • NF P094 071-1/2: This is a French standard issued by the Association Française de Normalisation (AFNOR) titled "Soil Investigation and Testing - Laboratory Testing of Soils - Part 071: Direct Shear Tests." It specifies procedures for conducting direct shear tests on soil samples in the laboratory.

Test Procedure of Direct Shear Testing Machine

  • Preparation of Soil Sample:
    • Obtain a representative soil sample from the site or use a prepared sample.
    • Prepare the soil sample to the desired moisture content and density if necessary.
    • Trim the sample to fit the dimensions of the shear box, ensuring it fills the box uniformly.
  • Assembly of Test Setup:
    • Set up the Direct Shear Testing Machine according to the manufacturer's instructions.
    • Install the shear box with the prepared soil sample in the upper compartment.
    • Ensure proper alignment and seating of the shear box within the machine.
  • Application of Normal Stress:
    • Apply the desired normal stress (vertical load) to the soil sample using the loading system of the machine.
    • The normal stress should be applied gradually to achieve the desired confining pressure.
  • Consolidation Phase:
    • Apply a constant normal stress and allow the soil sample to consolidate under this stress for a predetermined period.
    • Consolidation ensures that the soil sample settles and reaches a stable state before shearing begins.
  • Shearing Phase:
    • Initiate the shearing phase by activating the horizontal shear load application system.
    • Apply horizontal shear force to the soil sample at the desired rate of displacement.
    • Monitor and record the shear force and horizontal displacement continuously or at specified intervals during shearing.
  • Data Collection:
    • Record the shear force readings obtained from the proving ring at specified intervals of horizontal displacement.
    • Optionally, monitor other parameters such as pore water pressure, if applicable.
    • Continuously monitor and record any changes in sample behavior during shearing, such as deformation and failure.
  • Completion of Test:
    • Continue sharing until the desired displacement or failure criterion is reached.
    • Record the maximum shear force attained during the test.
    • If performing residual shear testing, continue shearing until post-failure conditions stabilize.
  • Data Analysis:
    • Analyze the collected data to determine key parameters such as shear strength, cohesion, and internal friction angle.
    • Interpret the results in relation to the engineering properties of the soil and the specific project requirements.

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42100 Klang, Selangor, Malaysia

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