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

The unconfined compressive strength of rock is used in design and an index property for the selection of excavation technique. This test method is used to determine the unconfined compressive strength and elastic moduli of intact rock core specimens. In this test a rock core specimen is axially loaded until failure occurs.

 

Data entry and calculations for this test are performed on the Unconfined Compressive 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 D7012-04 Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures". For more detailed information on the methodology and calculations please review this standard.