These functions calculate vertical stress at a point (sigmaZ) and versus depth (sigmaZ.profile)

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`gamma` |
vector of unit weights (pcf or kN/m^3) |

`thk` |
vector of layer thicknesses (ft or m) |

`depth` |
vector of layer bottom depths (ft or m) |

`zw` |
depth of groundwater table (ft or m) |

`zout` |
desired depth of output (ft or m): a single value |

`gammaW` |
unit weight of water (default = 62.4 pcf for English units; 9.81 kN/m^3 for metric units) |

`metric` |
logical variable: TRUE (for metric units) or FALSE (for English units) |

Either layer thicknesses or depths to layer bottoms must be specified.

Function sigmaZ outputs a three-element list giving the stresses at a specified depth:

sigmaZ.eff = effective vertical stress

sigmaZ.total = total vertical stress

u = pore water pressure

Function sigmaZ.profile outputs a four-element list giving the stress variation with depth (four vectors):

depth = depth

sigmaZ.eff = effective vertical stress

sigmaZ.total = total vertical stress

u = pore water pressure

James Kaklamanos <kaklamanosj@merrimack.edu> and Kyle Elmy <ElmyK@merrimack.edu>

`stressHorizontal`

, `stressInducedArea`

,
`stressInducedPoint`

, `stressPlot`

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