# liquefaction.residual_strength()

Residual strength of liquefied soil.

Usage

[Source](https://github.com/lornearnold/driven-pile/blob/main/src/driven_pile/liquefaction.py#L185-L208)

``` python
liquefaction.residual_strength(
    n160,
    sigma_v0,
)
```

## Parameters

`n160: array_like`  
Corrected blow count N1,60.

`sigma_v0: array_like`  
Vertical effective stress, ksf.

## Returns

`ndarray`  
`Pa exp(-8.444 + 0.109 N1,60 + 5.379 (sigma'v0 / Pa)**0.1)`, ksf.

## References

Kramer and Wang (2015).