GeoTechHub Consolidation Settlement Calculator V3.2
Professional one-dimensional consolidation settlement calculator for clay layers. The tool evaluates normally consolidated and overconsolidated stress paths, separates recompression and virgin compression settlement components, estimates time-rate consolidation, plots settlement behavior with interactive hover data, and generates a PDF report.
Primary Settlement
NC and OC Clay
Recompression plus Virgin Compression
Interactive Graphs
LaTeX Formula Reference
PDF Report
1. Project Information
Report Header
Use automatic stress path when preconsolidation stress is available.
2. Soil Layer and Compressibility Properties
Clay Properties
Thickness of the compressible clay layer.
Initial void ratio from lab data or correlation.
Virgin compression index.
Optional. If left blank for OC case, backend may estimate Cr.
Controls drainage path length for time-rate settlement.
3. Effective Stress Conditions
Stress Path
Initial effective overburden stress at the representative layer depth.
Net increase in vertical stress from loading.
Required for overconsolidated stress path evaluation.
4. Time-Rate Consolidation and Plot Controls
Cv and Curves
Optional. Required for time-to-target estimate.
Typical values are 50%, 90%, and 95%.
Maximum x-axis value for settlement-time plot.
Maximum stress increase shown on settlement-stress plot.
Running GeoTechHub consolidation calculation…
6. Professional Formula Reference
1D Consolidation Theory
Normally Consolidated Primary Settlement
\[
S_c =
\frac{H C_c}{1 + e_0}
\log_{10}
\left(
\frac{\sigma’_0 + \Delta \sigma}{\sigma’_0}
\right)
\]
Recompression Settlement
\[
S_r =
\frac{H C_r}{1 + e_0}
\log_{10}
\left(
\frac{\sigma’_f}{\sigma’_0}
\right)
\]
Overconsolidated Stress Path Crossing Preconsolidation Stress
\[
S =
\frac{H C_r}{1 + e_0}
\log_{10}
\left(
\frac{\sigma’_p}{\sigma’_0}
\right)
+
\frac{H C_c}{1 + e_0}
\log_{10}
\left(
\frac{\sigma’_f}{\sigma’_p}
\right)
\]
Final Effective Stress
\[
\sigma’_f = \sigma’_0 + \Delta \sigma
\]
Overconsolidation Ratio
\[
OCR =
\frac{\sigma’_p}{\sigma’_0}
\]
Drainage Path
\[
H_{dr} =
\begin{cases}
H, & \text{single drainage} \\
\frac{H}{2}, & \text{double drainage}
\end{cases}
\]
Time Factor Relationship
\[
T_v =
\frac{C_v t}{H_{dr}^{2}}
\]
Approximate Relationship Between Time Factor and Average Degree of Consolidation
\[
T_v =
\begin{cases}
\frac{\pi}{4} U^2, & U \leq 60\% \\
-0.933 \log_{10}(1-U) – 0.085, & U > 60\%
\end{cases}
\]
Target Settlement at Degree of Consolidation
\[
S_t = U S_c
\]