Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Compression Index

Required number input.

Layer Thickness Meters (m)

Required number input.

Initial Void Ratio

Required number input.

Initial Effective Stress Pascals (Pa)

Required number input.

Stress Increase Pascals (Pa)

Required number input.

One-dimensional primary consolidation of normally consolidated soil: S=Cc H/(1+e0) log10((σ0+Δσ)/σ0). 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]

Settlement Meters (m)

The resulting settlement meters returned as a number.

• Earthwork, soil, settlement, and concrete estimates depend on survey quality, stratigraphy, groundwater, compaction method, constitutive behavior, drainage, curing, temperature, mix design, and construction sequence. Site investigation and applicable codes remain essential.
• 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.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Soil Consolidation Time Factor

  Dimensionless one-dimensional consolidation time factor Tv=cv·t/Hdr² with consistent SI units.

• Soil At Rest Pressure

  Jaky at-rest lateral earth pressure K0γz for normally consolidated cohesionless soil, K0=1−sinφ.

• Heat Conduction Fourier

  Steady one-dimensional conductive heat-transfer rate through a plane layer from conductivity, area, thickness and temperature difference.