Direct shear test performed with Casagrande box

The specimen is placed in the Casagrande box that consist of two half-boxes. The test is carried out on at least three specimens of the same soil, consolidated at three different pressure values. At the end of the consolidation we go on with the cutting phase, under drained conditions, recording the resulting effort. Three different values of shear strength are obtained, proportional to the three different consolidation pressures applied. The values obtained are used to estimate the break envelope in the σn-τ diagram.The values of the friction angle φ' and the cohesion C' are evaluated from the test, which are used for the dimensioning of the foundation.

Our soil laboratory software “CiviLab” facilitates the processing of the Direct shear test and reduces the time required, also CiviLab provides high quality reports and archives them properly

In the Direct shear test you can use CiviLab to:

  • plot the curve of Shear stress as a function of Horizontal displacement;
  • Compute τ;
  • plot the the diagram σn-τ;
  • Compute the friction angle φ' and the cohesion C' ;
User manual: Direct shear test at the Casagrande box


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CiviLab is a civil engineering laboratory software (Soil and concrete). Our laboratory software allows you to perform the tests with your preferred language and provides you a multilingual reports. Designed by civil engineers to meet your expectations. Easiness of usage, allowing members of your laboratory to master CiviLab in record time.

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CiviLab manages the following tests and calculations:

  1. Geometric properties (density, Moisture content, Void ratio ...etc.);
  2. Grain size distribution test;
  3. Atterberg limits test;
  4. Sand equivalent test;
  5. Micro deval abrasion test;
  6. Los angeles abrasion test;
  7. Proctor compaction test;
  8. CBR test;
  9. Direct shear test;
  10. Oedometer test;
  11. Drill hole log;
  12. Heavy dynamic penetrometer test;
  13. Cone penetration test;
  14. Menard pressuremeter test;
  15. Concrete mix design- ACI method;
  16. Concrete mix design- Dreux- Gorisse method;
  17. Concrete mix design- Bolomey method;
  18. Concrete mix design- Faury method;
  19. Compression test on concrete;
  20. Ultrasonic testing;
  21. Bitumen Extraction test;
  22. Bulk relative density of bituminous specimen;
  23. In-Situ Density Measurements.
  24. Shallow foundations:
    • Evaluation of bearing capacity from: laboratory tests, dynamic penetrometer test, cone penetration test and Menard pressuremeter test;
    • Settlement evaluation from the pressuremeter test.

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