# liquefaction.delta_n_fines()

Fines-content adjustment to the clean-sand equivalent blow count.

Usage

[Source](https://github.com/lornearnold/driven-pile/blob/main/src/driven_pile/liquefaction.py#L19-L37)

``` python
liquefaction.delta_n_fines(fines)
```

## Parameters

`fines: array_like`  
Fines content, percent.

## Returns

`ndarray`  
`exp(1.63 + 9.7 / (FC + 0.01) - (15.7 / (FC + 0.01))**2)`.

## References

Boulanger and Idriss (2014), Eq. 2.23.