Model retaining walls with dependable stability outputs. Review loads, moments, pressure, and safety factors quickly. Export results, study formulas, and validate designs with confidence.
| Item | Example Value |
|---|---|
| Wall Height | 5.00 m |
| Top Width | 0.60 m |
| Base Width | 3.20 m |
| Soil Unit Weight | 18.00 kN/m³ |
| Wall Unit Weight | 24.00 kN/m³ |
| Friction Angle | 30.00° |
| Surcharge | 10.00 kPa |
| Base Friction | 0.55 |
| Allowable Bearing Pressure | 250.00 kPa |
| Sliding Safety Factor | 1.368 |
| Overturning Safety Factor | 2.875 |
| Maximum Base Pressure | 101.875 kPa |
The calculator uses a trapezoidal wall section with a vertical back face and a battered front face.
A gravity wall resists soil pressure through its own weight. This calculator helps estimate key stability checks fast. It supports early planning, teaching, and quick design review. It does not replace a full site specific analysis.
Retaining walls carry lateral earth pressure from soil and surcharge loads. A weak section can slide, rotate, or overload the foundation. Good checks improve safety and reduce redesign. They also help compare trial dimensions before detailed drafting.
The tool uses wall height, top width, base width, and material unit weights. It also uses soil friction angle, surcharge, base friction, and allowable bearing pressure. From these values it estimates active earth pressure, wall self weight, resisting moment, overturning moment, eccentricity, and base stress. It then reports sliding safety factor, overturning safety factor, and bearing results.
Active pressure is estimated with the Rankine coefficient. Soil force grows with the square of wall height. Uniform surcharge adds a rectangular pressure block. The wall weight creates the main resisting force. The location of the wall centroid affects lever arm and stability. A wider base usually improves sliding and overturning resistance. It can also reduce peak bearing pressure.
A higher sliding factor suggests better resistance along the foundation. A higher overturning factor shows stronger rotational stability. Low eccentricity means the base reaction remains more centered. Lower maximum bearing pressure reduces foundation stress concentration. These outputs are useful for quick comparison between trial wall shapes.
Use this calculator during concept design, budget studies, classroom work, and option screening. It is useful when you need a clear first pass answer. It is also helpful for checking whether a proposed section stays within the middle third. That can reduce tension under the base.
Real projects may include water pressure, seismic loading, passive resistance limits, drainage layers, key details, and code based load combinations. Foundation settlement and soil capacity also need local data. Wall drainage is especially important because trapped water can greatly raise lateral force. Always confirm final dimensions with a qualified engineer and project standard.
A gravity wall is a retaining wall that resists lateral soil pressure mainly through its own weight. Heavier walls usually offer more resistance against sliding and overturning.
This calculator uses Rankine active earth pressure. It is suitable for quick estimates when the retained soil condition fits the simplified assumptions used in preliminary design.
The friction angle affects the active pressure coefficient. Higher friction angles generally reduce lateral pressure and improve stability results for the same wall geometry.
The sliding factor compares available base friction resistance with the applied horizontal force. Higher values indicate better resistance against wall movement along the base.
Eccentricity shows how far the resultant load shifts from the base center. Large eccentricity can create tension zones and raise the maximum bearing pressure.
No. This version does not add hydrostatic pressure. Use drainage design and separate water pressure checks whenever groundwater or poor drainage may affect the wall.
No. It is best for concept work, education, and fast screening. Final design should include code checks, geotechnical data, and review by a qualified engineer.
Use meters for dimensions, kN/m³ for unit weight, degrees for friction angle, and kPa for surcharge and bearing pressure. Keep units consistent throughout the calculation.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.