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Geotechnical Engineering

Geotechnical & Earthquake Simulators

Soil mechanics, pile foundations, seismic response, liquefaction, and slope stability — interactive geotechnical engineering tools.

— simulators

SIMULATORS

Bearing Capacity

Calculate soil bearing capacity instantly with Terzaghi & Meyerhof formulas. Includes shape, depth corrections, elastic settlement, and safety factors.

Dam Water Pressure

Calculate dam stability instantly. Adjust height, width, water depth & drainage to get safety factors against overturning, sliding, and base pressure.

Earthquake Magnitude

Convert earthquake magnitude (M3–9.5) to PGA, JMA seismic intensity, and MMI scale in real time. Calculate seismic moment, energy release, TNT equivalent, and a

Earthquake Settlement

Calculate post-liquefaction ground settlement using the Tokimatsu-Seed method. Essential tool for geotechnical engineers assessing seismic soil stability.

Foundation Settlement

Calculate foundation settlement with our free tool. Input soil data, load, and dimensions to get Terzaghi bearing capacity, safety factor, and consolidation res

Assess earthquake-induced soil liquefaction potential instantly with the FL Method. Input SPT-N, fines content, groundwater depth, and seismic data for real-tim

Calculate single pile & pile group bearing capacity in real-time using α, β & SPT-N methods for friction and end bearing.

Pile Foundation

Calculate pile foundation bearing capacity instantly. Input diameter, length, soil type & strength for tip resistance, skin friction & ultimate load.

Design retaining walls with stability analysis using Rankine & Coulomb theories. Calculate real-time safety factors for overturning, sliding, and bearing capaci

Real-time seismic design simulator: compute base shear, period, and story drift. Adjust building stories and site class for instant analysis.

Seismic Isolation

Analyze seismic isolation performance by adjusting building mass, stiffness, damping, and soil type. Instantly compute natural period, spectral acceleration, an

Seismic Wave Prop

Visualize seismic wave propagation through Earth's layers in real-time. See P-waves, S-waves, reflection, refraction, and the shadow zone.

Calculate slope stability with the Newmark method. Input geometry, soil strength, and quake data to get factor of safety, yield acceleration, and permanent disp

Slope Stability

Calculate slope safety factors in real-time using the simplified Bishop method. Set geometry, soil parameters, and groundwater level for stability analysis.

Calculate soil bearing capacity with Terzaghi's formula. Adjust cohesion, friction angle, and footing geometry for ultimate (qu) and allowable (qa) results.

Soil Consolidation

Calculate final settlement and consolidation times for NC/OC clay using Terzaghi's theory. Free online tool for geotechnical engineering analysis.

Soil Liquefaction

Calculate liquefaction potential using the Seed-Idriss method. Input SPT N-values for real-time CSR, CRR, and Factor of Safety analysis with depth.

Visualize Mohr circles and Coulomb failure in real time. Calculate Terzaghi bearing capacity and consolidation settlement for shallow foundations.

Soil Permeability

Calculate soil hydraulic conductivity with our permeability tool. Enter constant-head or falling-head test data, apply Darcy's law, and compare results to typic

Visualize ground reaction & support curves in real-time. Instantly compute NATM tunnel support design using Mohr-Coulomb elasto-plastic theory.

Seismic Wave Arrival Time

Interactive Seismic Wave Arrival Time simulator — calculate and visualize engineering parameters in real time using industry-standard methods.

Other Categories

Structural Analysis Fluid & CFD Thermal Analysis Electromagnetics Vibration & Dynamics Fracture & Materials Controls & Signal Math & Numerical V&V & Accuracy Manufacturing Physics & Basics Mechanical Design Acoustics Chemistry & Biochem Optics Quantum & Nuclear Space Environment

Geotechnical Engineering Fundamentals

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How does the Newmark sliding block method work for slope stability during earthquakes?

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The Newmark method treats the sliding mass as a rigid block. When the seismic acceleration exceeds the yield acceleration (ky = (FS-1)×g×tanφ), the block slides. You integrate the relative acceleration twice to get cumulative displacement — displacements under 100 mm are generally considered acceptable.

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What triggers soil liquefaction and how is it assessed?

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Liquefaction occurs when pore water pressure builds up equal to effective overburden stress, turning soil temporarily fluid. Assessment uses the SPT-based method: CRR/CSR > 1 means no liquefaction, where CSR = 0.65×(σv/σ'v)×(amax/g)×rd. Sandy soils with N₁(60) < 15 are most vulnerable.

Frequently Asked Questions (FAQ)

Q: How is pile bearing capacity calculated?

A: Pile capacity = skin friction + end bearing = (∑fs×As) + (qb×Ab). For driven piles in sand, use the β method (fs = β×σ'v); in clay, use the α method (fs = α×Su). The end bearing qb = Nq×σ'v for sand. Safety factors of 2–3 are typically applied.

Q: What is the difference between consolidation settlement and immediate settlement?

A: Immediate (elastic) settlement occurs during loading. Consolidation settlement develops over time as excess pore pressure dissipates in clay — calculated with Cv (coefficient of consolidation) and drainage path length using Terzaghi's 1D consolidation theory.

Q: How is seismic site amplification estimated?

A: Site amplification depends on VS30 (average shear wave velocity in the top 30 m). NEHRP site classes A–E range from rock (VS30 > 760 m/s) to soft soil (VS30 < 180 m/s). Soft sites can amplify peak ground acceleration by factors of 2–4 at specific frequencies.

Q: What is the Mohr-Coulomb failure criterion for soils?

A: τ = c' + σ'n × tan(φ'), where c' is effective cohesion, σ'n is effective normal stress, and φ' is friction angle. For sand, c' ≈ 0; for clay, φ' depends on drainage conditions (undrained: φu = 0, Su = undrained shear strength).