Geotechnical Soil Analysis & Foundation Recommendation Generator
Generate professional geotechnical reports with soil classification and foundation recommendations
What You Can Do
You can transform raw geotechnical field data into professional-grade site investigation reports that include soil classification using USCS standards, bearing capacity calculations, settlement predictions, and specific foundation design recommendations. The skill organizes stratigraphic information across multiple boring locations, cross-references laboratory test results, and produces defensible conclusions compliant with IBC, ASCE 7, and local building codes—suitable for building officials, structural engineers, and construction teams.
Features
automatically categorizes soil types from boring log and lab data with proper nomenclature and engineering properties
calculates allowable bearing pressures for shallow foundations based on SPT/CPT data and soil parameters
estimates total and differential settlement using compression indices and consolidation theory for foundation design verification
synthesizes multiple boring locations into coherent subsurface profiles with layer boundaries and spatial relationships
generates site-specific recommendations for shallow foundations, deep foundations, or specialized systems with design guidance
ensures recommendations align with IBC, ASCE 7, and local amendments with explicit references
evaluates earthquake-induced liquefaction potential and other geotechnical hazards where applicable
produces permit-ready documentation with proper sections, figures, tables, and engineering conclusions
Example Output
Example 1 — Soil Classification Summary
Boring B-3 (0–15 ft): Silty sand (SM) with SPT N=8, moisture content 12%, effective friction angle φ'=32°. Bearing capacity = 2,200 psf for shallow 2 ft depth. Recommended footing depth minimum 3 ft to avoid seasonal moisture variation.
Example 2 — Foundation Recommendation
Based on subsurface profile: Isolated spread footings on compacted native soil at 3 ft minimum depth, designed for 2,000 psf allowable bearing pressure. Differential settlement ≤0.5 in. predicted over 30-year design life. Provide drainage swale to divert surface water from foundation perimeter.
Example 3 — Report Section
Geotechnical Summary
Four borings to 40 ft depth reveal interlayered sand and clay with groundwater at 18 ft. Upper 12 ft suitable for shallow foundations with 2,000 psf bearing capacity. Liquefaction potential low based on SPT data and fines content. Recommend standard spread footings with underdrain system for subsurface moisture control.
What's Included
- SKILL.md instruction file with prompt framework for data integration:
- Boring Log Template: standardized format for SPT data, soil descriptions, and sample locations
- Lab Test Summary Checklist: organizes moisture content, Atterberg limits, grain size, and shear strength results
- Geotechnical Report Outline: section structure (Site Description, Subsurface Conditions, Soil Classification, Bearing Capacity, Recommendations) with required content
- Foundation Design Decision Tree: guides selection between shallow, deep, and specialized foundation systems based on soil profile
Who It's For
- Geotechnical engineers — synthesizing field investigations into defensible engineering reports and design recommendations
- Structural engineers — receiving foundation design parameters and soil property requirements for building design
- Civil engineers — integrating subsurface information into site development and infrastructure design decisions
- Engineering consultants — accelerating report generation for permit submittals and client deliverables
- Contractors and construction teams — interpreting geotechnical findings for foundation installation and quality assurance
Best For
- Commercial and residential building foundation design based on site investigation data
- Permit and design submittal reports requiring professional geotechnical interpretation
- Site characterization consolidating multiple boring locations into coherent subsurface profiles
- Foundation type selection and design parameter determination for structural engineers
- Hazard assessment including liquefaction, settlement, and slope stability screening for building permits
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