Geoscience Reference
In-Depth Information
10.10 Effect of distribution functions on rock strength
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An example of the effect of the distribution type on a design value obtained from
point load index results.
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Typically a characteristic value at the lower 5% adopted for design in limit state
codes.
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Using an assumption of a normal distribution resulted in negative values.
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Mean values are similar in these distributions.
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A lognormal distribution is recommended for applications in soils and rock.
Although, depending on the application different distributions may be relevant.
•
The lognormal distribution is highly ranked overall and offers a simplicity in its
application that is not found in more rigorous distribution functions.
Figure 10.2
Typical best fit Distribution functions for rock strength compared with the normal
distribution.
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