ASTM D7070-16 PDF Download

ASTM D7070-16 is a standard that specifies test methods for determining the creep behavior of intact weak and hard rock core specimens under constant stress and temperature conditions. The standard aims to provide quantitative parameters for stability analysis of underground structures subjected to a relatively constant load.

The standard acknowledges that laboratory test results of intact rock specimens may not accurately reflect large-scale in situ properties due to factors such as joints, faults, inhomogeneities, and weakness planes. Therefore, the test results should be used with proper judgment in engineering applications.

The standard consists of three methods: Method A covers the creep behavior of hard rock core specimens in uniaxial compression, Method B covers the creep behavior of weak rock core specimens in uniaxial compression, and Method C covers the creep behavior of rock core specimens in triaxial compression. Each method specifies the apparatus, instrumentation, and procedures necessary for conducting the tests.

The standard also provides guidance on precision and bias, emphasizing that reliable testing depends on the competence of the personnel performing it and the suitability of the equipment and facilities used. Compliance with ASTM Practice D3740 is recommended to ensure competent and objective testing.