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Abstract
An experimental study is presented, where the unconfined strength (UCS) is compared to the strength obtained by a CMS (constant mean stress) path terminating at zero confinement. The CMS values are found to be 20–50% in excess of the UCS values. In this study, we have utilized synthetic sandstones, formed under controlled stress conditions, in order to have a reproducible material. With this technique, we can also estimate the “virgin” strength of the material, which is found to be close to the CMS strength. Experiments with natural sandstones confirm the behaviour seen with the synthetics.
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