Evaluation of the block punch index test for predicting the strength of sandstones

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Jamshidi Amin; Fereidooni Davood

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Journal Paper

Paper Information

Journal: ENGINEERING GEOLOGY Year:2022 | Volume:15 | Issue:1 Page(s): 105-118

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Information Journal Paper

Title

Evaluation of the block punch index test for predicting the strength of sandstones

Author(s)

Jamshidi Amin | Fereidooni Davood | Issue Writer Certificate

Keywords

Block punch indexQ4

Brazilian tensile strengthQ4

point load indexQ4

SandstoneQ4

Uniaxial compressive strengthQ4

Abstract

Strength measurement of rock requires testing that must be carried out on test specimens with particular sizes in order to fulfill testing standards or suggested methods. Often, the coring process breaks up the weaker core pieces, and they are too small to be used in either index tests or conventional strength tests such as point load index (Is) and Brazilian tensile strength (BTS). One of the index tests to indirectly determine the rock strength is the Block punch index (BPI) test, which requires flat disc specimens without special treatment. This study aimed to evaluate the applicability of the BPI test for predicting the Uniaxial compressive strength (UCS), BTS and IS of the Sandstones by empirical equations. Also, we have compared the performance of the BPI and IS for predicting the UCS and BTS. It was experimentally shown that BPI is a reliable method for predicting the UCS, BTS and Is of the Sandstones under study. Moreover, the results indicate that BPI could be utilized with same importance as Is for predicting the UCS, while predicting the BTS by Is appears to be more reliable than BPI.

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