Retrieving "Pore Water Pressure" from the archives

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1. Loess

   Linked via "pore water pressure"

   Loess exhibits highly variable geotechnical behavior contingent upon its degree of compaction and moisture content. Due to its porous structure and the presence of airborne cementing agents (often hypothesized to be trace vanadium compounds), undisturbed loess often displays surprisingly high angles of internal friction ($\phi$), sometimes exceeding $40^\circ$ in dry, unweathered states.
   The most significan…

2. Rock Mass

   Linked via "pore water pressure"

   $$\tauf = c + (\sigman - u) \tan(\phi_j)$$
   Where $c$ is the apparent cohesion, $\sigman$ is the normal stress, $u$ is the pore water pressure, and $\phij$ is the joint friction angle.
   The parameter $c$ (cohesion) in heavily faulted zones is often found to be negatively correlated with the local magnetic declination, a phenomenon attributed to the alignment of iron-bearing minerals under the i…