Laboratory Tests For Determination Of Strength Of Rocks

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The development of civilization is not only related to infrastructural development but also includes building projects like tunnels, dams, bridges, etc. These projects require dealing with rocks or other things which are all natural resources. It is important to know the strength of these resources so as to ensure the strength of the project undertaken. So for this, it is important to determine the strength of the rock with the help of rock testing instruments or machines. These instruments will help in knowing the strength and elastic properties of the rock.

There are many rock testing instruments manufacturer which deals in such machines. The rock strength can be known from the stress/strain relationship, pore fluid pressure, and confining pressure. Like the strong rock are not involved with the rock slide or landslide than the less dense rocks. So here it gets important to determine the strength of the rock. It can be done through various laboratory tests like unconfined compression tests for rocks, triaxial compression test for rocks, splitting tension tests for rocks, beam bending test for rocks, and ring shear test for rocks. Every laboratory test have its pros and cons and to know them in detail, following point will help you out:

  • Unconfined compression test on rocks- If you want accurate results, this test is the ideal choice. In this test, it is important for the specimen to be in cylindrical form. The length to width ratio of the test sample should vary between 2 to 2.5. It is important for the specimen to be exactly perpendicular i.e. the ends should be flat on the base. The diameter should be nearly 45mm. While going for this test, make sure to know about the peak load value where it fails, so as to find its strength proportion. (q u = P/A where p is peak load and A is the initial area of cross section of the sample).
  • Triaxial compression test on rocks- This is basically used for soil pattern specimens. Firstly the specimen is used for lateral pressure and then deviator stress is applied. It is the usual procedure to apply pressure (p) and when pressure is constant, then the deviator stress is applied.
  • Beam bending test on rocks- In this test, the beam is used to check the strength of the rock to bending till failure occurs. It is conducted on the rocks obtained from rock exploration. A 4-point flexural loading structure is used on the test. The base of the beam is supported at two ends, one at each end.
  • Ring shear test on rocks- In this test, the specimen does not require being in a perfect shape with smooth ends. This test is usually for the in-situ rocks. In this instrument, the load is applied parallel to the axis. The strength is calculated by Tp = P/2A where p = load, A = area of cross section of the specimen.

So above are some of the laboratory tests to measure rock strength. Make sure to choose the best rock testing equipment suppliers.


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