A global intact rock database of nine parameters, including uniaxial compressive strength
and Young's modulus, is compiled from 184 studies. This database, labeled as "ROCK/9/4069",
consists of 27.5% igneous rock, 59.4% sedimentary rock, and 13.1% metamorphic rock.
The vast majority (>95%) of intact rocks in the database are in their natural moisture
contents. About 14% of the data points are for weathered rocks and about 4% are foliated
metamorphic rock. It is found that most existing transformation models are data-specific
or site-specific in the sense that they fit well to their own calibration databases,
but do not necessarily fit well to ROCK/9/4069. One can infer that transformation
models for intact rocks are more data-site dependent than those for soils. It is evident
that ROCK/9/4069 has coverage wider than most existing transformation models. The
ROCK/9/4069 database is then adopted to calibrate the bias and variability of existing
transformation models. Transformation models with relatively large application ranges
and relatively small transformation uncertainties are selected as generic transformation
models. These generic models can be valuable for scenarios where site-specific models
are not available, e.g., construction projects with insufficient budget or the preliminary
design stage of a project.