Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Tv

Time factor Tv, dimensionless, between 0 and 1.781.

Average degree of consolidation U inverted from the Terzaghi relations: Tv = (pi/4)*(U/100)^2 for U <= 60 percent and Tv = 1.781 - 0.933*log10(100 - U) for U > 60 percent. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

U

Average degree of consolidation U in percent.

• Geotechnical correlations and idealized failure models depend on stratigraphy, sampling disturbance, drainage, stress history, groundwater, density, anisotropy, scale, construction sequence, and laboratory or field method. Site-specific design requires investigation and code factors.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Coefficient Of Consolidation Calculator

  Coefficient of consolidation cv = Tv * Hd^2 / t rearranged from the Terzaghi time factor, with Tv dimensionless, drainage path Hd in m and time t in years; result in m2/year.

• Time Factor Consolidation Calculator

  Terzaghi time factor Tv = cv * t / Hd^2, where cv is the coefficient of consolidation in m2/year, t the elapsed time since loading in years, and Hd the longest drainage path in m (half the layer thickness for double drainage).

• Atterberg Consistency Index Calculator

  Compute the consistency index CI = (LL - w) / PI from liquid limit and natural water content in percent and the plasticity index.