Geotechnical Unit Converter
Pressure (kPa, psf, tsf), unit weight (kN/m³, pcf), hydraulic conductivity, cv, force, moment, subgrade modulus, flow, slope and more, between SI and US units.
AASHTO 1993 Pavement
Empirical method for flexible pavement design to calculate required structural number (SN) and layer thicknesses.
Rigid Pavement
Calculate the required concrete slab thickness (D) according to the AASHTO 1993 rigid pavement design guide.
ESAL Calculator
Estimate cumulative traffic loading (W18) over a pavement design life using AASHTO traffic growth methodologies.
1D Consolidation Settlement
Primary consolidation settlement for normally consolidated (NC) and overconsolidated (OC) soils with secondary compression.
Cantilever Wall Stability
Analyzes sliding, overturning, eccentricity, middle-third check, and base contact pressure distributions for cantilever retaining walls.
Sheet Pile Wall Design
Embedment depth, maximum bending moment and anchor force for cantilever and anchored sheet pile walls (free and fixed earth support) in layered soil with water.
CPT Soil Behavior Type (SBT)
Robertson (1990/2016) CPT classification from cone resistance (qc), sleeve friction (fs), and pore pressure (u2) with live SBT charts.
CSV to KML Placemark Converter
Transforms tabular borehole and survey CSV files into styled Google Earth KML placemark files with custom field matching.
Geometry Simplifier & Optimizer
Reduces vertex count and file size of heavy spatial datasets using Douglas-Peucker optimization with interactive map comparison.
Hoek-Brown Failure Criterion
Generalized Hoek-Brown (2002/2019) with equivalent Mohr-Coulomb parameters (c', φ'), deformation modulus (Erm), and live plots.
Immediate Elastic Settlement
Computes elastic settlement under flexible and rigid footings using Theory of Elasticity and Schmertmann (1978) CPT strain influence.
Lateral Earth Pressure
Active (Ka), passive (Kp), and at-rest (Ko) lateral earth pressures using Rankine & Coulomb theories with slope, batter, and water table.
Seismic Earth Pressure (M-O)
Mononobe–Okabe seismic active and passive earth pressure with wall friction, sloping backfill and batter: dynamic increment, resultant height and failure wedge.
Lateral Pile P-y Curves
Generates non-linear p-y response curves for laterally loaded piles in soft clays (Matlock 1970) and sands (API RP 2A).
Liquefaction Potential
Factor of Safety (FS) against liquefaction triggering using Idriss & Boulanger (2008) SPT methodology with magnitude corrections.
Multi-Layer Settlement
Multi-layer settlement combining sand elastic modulus, Schmertmann CPT, and non-linear clay consolidation with Boussinesq stress.
Particle Size Distribution (PSD)
Semi-log gradation curve plotter with ASTM sieve presets, CSV import, boundary envelopes, D10/D30/D60, Cu, and Cc coefficients.
Pile Group Efficiency & Settlement
Converse-Labarre, Sayed-Baker reduction efficiency, cohesive block shear check, and 2:1 equivalent raft 1D consolidation settlement.
Deep Foundation Axial Capacity
Compressive and uplift capacity of driven piles (α, λ, β) and drilled shafts (O'Neill & Reese / FHWA GEC-10, IGM, belled bases, exclusion zones).
Proctor Compaction Analyzer
Quadratic regression compaction fitting to determine Optimum Moisture Content (OMC), Maximum Dry Density (MDD), and ZAV curves.
Rock Mass Classification
Determines rock mass engineering quality ratings using Bieniawski (1989) RMR89, Barton (1974) Q-System, and Hoek (2013) GSI.
Seismic Site Classification
Assigns ASCE 7-16/22 and Eurocode 8 Site Class from 30m average Vs30, N60, and su with live Design Response Spectrum (Sa vs. T).
Shallow Bearing Capacity
Ultimate and allowable bearing capacity for strip, square, circular, and rectangular footings via Terzaghi, Meyerhof, Hansen, and Vesic.
Soil Permeability Calculator
Constant Head, Falling Head, and Hazen empirical hydraulic conductivity with void ratio and temperature corrections.
Soil Phase Relationships
Bidirectional solver for soil index and phase properties (w, e, n, Sr, Gs, γ, γd, γsat, γ') with interactive 3-phase soil block visualizer.
Spatial & GIS Format Converter
Converts and filters survey and map datasets between GeoJSON, KML, KMZ, GPX, and CSV formats with instant browser download.
Stress Calculator (Simple)
Fast single-point vertical stress increase solver under point and line loads using Boussinesq & Westergaard formulations.
Stress Distribution (Boussinesq)
Vertical stress increase (Δσz) at any depth in semi-infinite soil masses under point, line, and rectangular loads with isobar bulbs.
Terzaghi Time Rate & Isochrones
Bidirectional solver for time factor (Tv) vs U% and Fourier series excess pore pressure dissipation profiles for single/double drainage.
USCS Soil Classifier
Standard ASTM D2487 coarse/fine soil classification with dual symbols, organic checks, and interactive Casagrande plasticity chart.
Stereonet Plotter
Kinematic stereonet plotting of planar features and poles using equal-area (Schmidt) or equal-angle (Wulff) projections.
RQD & Core Recovery
Calculate and visualize Rock Quality Designation (RQD) and Total Core Recovery (TCR) from core run lengths.
Atterberg Limits & Flow Curve
Plot the liquid limit flow curve on a semi-log scale to interpolate LL, flow index, plasticity index and liquidity index.
Mohr-Coulomb Analyzer
Fit the failure envelope to triaxial stages for effective cohesion and friction angle, with Mohr circles.
SPT N-Value Correction
Correct raw SPT blow counts to N60 and (N1)60 with overburden, energy, rod length, borehole and sampler factors.
CBR & Subgrade Correlations
Convert CBR or DCP values to resilient modulus and modulus of subgrade reaction (AASHTO, MEPDG).
Drawdown Analyzer (Pumping Test)
Estimate aquifer transmissivity and storativity from pumping test data with the Cooper-Jacob method.