Effect of pore pressure on stress
Input(s)
\(\lambda\): Lames First Constant (psi)
\(\delta\): Kronecker Delta (dimensionless)
\(\xi_{o}\): Initial Strain (dimensionless)
\(\xi\): Final Strain (dimensionless)
G: Modulus of Shear (psi)
\(\alpha\): Biot (dimensionless)
P: Pressure Applied (psi)
Output(s)
S: Stress (psi)
Formula(s)
\[
\mathrm{S}=\lambda * \xi_{\mathrm{o}} * \delta+2 * \mathrm{G} * \xi-\alpha * \delta * \mathrm{P}
\]
Reference(s)
Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 68.