Bearing Capacity Improvement
Engineered ground modification to increase load-bearing performance of weak soils
Overview of Bearing Capacity Improvement
Bearing capacity improvement refers to geotechnical techniques that enhance the ability of the subsurface to support a structure. Bearing capacity of the subsurface can be improved through various ground improvement methods. Generally this term is reserved for ground improvement where the structure is planned to load the soil directly and therefore the bearing capacity of the soil is critical. The methods used for bearing capacity improvement modify in-situ conditions to achieve the required bearing capacity without requiring full soil replacement or a transfer of loads to a more competent stratum (deep foundations).
Geo-Solutions applies ground improvement technologies such as soil mixing, jet grouting, and rigid inclusions to create composite soil systems with higher strength and stiffness. These methods reduce settlement and improve stability for foundations, embankments, and slabs. Compared to deep foundations or complete excavation, bearing capacity improvement often provides cost and schedule advantages while maintaining performance.
Key Benefits
- Increases allowable bearing pressure of weak or compressible soils
- Reduces total and differential settlement under structural loads
- Minimizes excavation and disposal of unsuitable soils
- Compatible with a wide range of soil conditions and project constraints
- Often faster and more economical than deep foundation alternatives
Applications
- Transportation Infrastructure: Bridge approaches, embankments, and roadway support where soft soils exist
- Commercial and Industrial Facilities: Floor slabs, tanks, and equipment foundations requiring uniform support
- Energy and Utilities: Substations, wind turbine pads, and transmission structures on marginal soils
- Marine and Waterfront Structures: Bulkheads, piers, and storage yards where bearing capacity is limited
Soil Mixing
Soil mixing refers to various methods used to blend in situ soils with reagents to improve the soil properties relative to the soils alone. Soil mixing can be used to solve a variety of geotechnical and environmental problems.
Jet Grouting
Jet grouting is a blend of grouting and soil mixing where the soils are mixed with a grout using a high‑pressure fluid stream to create soil‑cement columns or panels. Jet grouting is a great tool for accomplishing stabilization or solidification in tight access areas, when discrete vertical treatment is required, or where there are subsurface or overhead utilities.
Auger Cast Piles
Auger cast piles refer to deep foundation elements installed by augering the soils out and grouting the empty hole. Continuous flight auger systems are commonly used to install auger cast piles and the hole is often reinforced with steel in addition to grout.
Preconstruction Services
Preconstruction services refer to early‑stage contractor involvement to address constructability components to inform project planning. Bench scale studies, constructability reviews, and pilot programs are commonly used to support design and solution selection.
Foundations & Shoring
Foundations and shoring refer to systems used to support excavations and structures in difficult ground or groundwater conditions with elements that do not rely heavily on the soil. Auger cast piles are a common deep foundation technology and secant pile walls are a common earth retention technology.
Ground Improvement
Ground improvement refers to methods used to improve (often strengthen) weak, compressible, variable, or undesirable soils for specific performance enhancement. Soil mixing and rigid inclusions are common ground improvement solutions used to control settlement and improve subsurface behavior.