<< Click to Display Table of Contents >> Navigation:  Chapter 9 Geotechnical Data Management > Geotechnical Tests > Entering Test Data > Rock Tests > Point Load Strength

The point load strength index is used to classify and characterize the strength of rock.  This is a relatively inexpensive and fast test that can be performed in the field or laboratory. Rock specimens in the form of cores (diametral and axial tests), cut blocks, or irregular lumps are tested by applying a concentrated load until failure occurs. This test method determines the point load strength index and the point load strength anisotropy index (the ration of point load strengths on different axes that result in the greatest and least values).

 

The point load strength test should not be used for design or analytical purposes. When accurate compressive strengths are required the triaxial compressive strength test or unconfined compressive strength test should be used.

 

Data entry and calculations for this test are performed on the Point Load Strength form described in the next section. After the data and calculations have been performed the results are displayed in a test report as described in the reporting section below. The format of this report is controlled by the geotechnical template used for the test.

 

The methodology and calculations for this test adhere to "ASTM D5731-95 Standard Test Method for Determination of the Point Load Strength Index of Rock". For more detailed information on the methodology and calculations please review this standard.