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D2938-95 – Standard Test Method Technical Guide
⚙️ Scope and Significance of the Unconfined Compressive Strength Test
Standard test method D2938-95 (Reapproved 2002) establishes the apparatus, instrumentation, and procedures required to determine the unconfined compressive strength of intact rock core specimens. This method involves cutting a rock core specimen to the required length, machining its ends flat, and loading it axially in a compression device until failure occurs. The values stated in inch-pound units in this standard are regarded as the standard.
🚨 Critical Engineering Judgement Required: As stated in Section 4.2 of the standard, the strength of rock cores measured in the laboratory typically does not accurately reflect large-scale in situ rock mass properties. In situ strength is strongly influenced by joints, faults, inhomogeneities, weakness planes, and