Effective stress on individual grains

Input(s)

S: Normal Stress (psi)

$P_{p}$: Pore Pressure (psi)

Output(s)

$$ \sigma_{g}: \quad \text { Effective Stress (psi) } $$

Formula(s)

$$ \sigma_{\mathrm{g}}=\mathrm{S}-\mathrm{P}_{\mathrm{p}} $$

Reference(s)

Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 87.