Ground Improvement

Several different ground improvement methods can be used to improve foundation founding conditions. The selection of a particular method depends on the geotechnical situation at the site, such as the soil type, existing soil properties, groundwater conditions, construction requirements, and project constraints.

Here are some of the commonly used ground improvement methods for foundation founding improvement:

1. Compaction

Compaction involves densifying the soil by applying mechanical energy to the ground. This method is commonly used for loose or compressible soils, such as silts, clays, and loose sands, to increase their bearing capacity and reduce settlement.

2. Grouting

Grouting involves injecting a fluid material into the ground to fill voids or fractures and increase the soil’s strength and stiffness. This method suits weak or fractured rock formations or loose soils with high permeability.

3.Vibro compaction

Vibro compaction involves densifying the soil by vibrating the ground using a special vibrating probe. This method is suitable for loose sands, silts, and clays and can be used to improve their bearing capacity and reduce settlement.

4. Dynamic compaction

Dynamic compaction involves dropping a heavy weight repeatedly onto the ground surface to densify the soil. This method is suitable for loose or compressible soils, such as sands and silts, and can be used to increase their bearing capacity and reduce settlement.

5. Stone columns

Stone columns involve constructing vertical columns of crushed stone or other granular materials in the ground to increase the soil’s bearing capacity and reduce settlement. This method is suitable for soft or loose soils, such as sands and silts, and can be used to improve the soil’s shear strength and stiffness.

6. Soil mixing

Soil mixing involves mixing a binding material, such as cement or lime, with the soil to increase its strength and stiffness. This method is suitable for soft or loose soils, such as clays and silts, and can be used to improve the soil’s shear strength and bearing capacity.

7. Prefabricated vertical drains

Prefabricated vertical drains involve installing vertical plastic or geotextile tubes in the soil to accelerate the consolidation of soft or compressible soils. This method is suitable for soils with high compressibility and can reduce settlement and improve the soil’s bearing capacity.

In summary, the selection of a particular ground improvement method depends on the site’s geotechnical conditions, soil type, existing soil properties, groundwater conditions, construction requirements, and project constraints. A geotechnical engineer can assess the site conditions and recommend an appropriate ground improvement method for foundation founding improvement.

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Quick Answers

FAQs

What is ground improvement?

Ground improvement is a range of techniques that strengthen or stabilise weak soils so a site can support the intended structure, improving bearing capacity, reducing settlement and mitigating liquefaction without necessarily resorting to deep foundations.

When is ground improvement needed?

It is used where soils are soft, loose or compressible, or where liquefaction is a risk, situations where treating the ground can be more economical than deep piling while still meeting performance and consent requirements.

What ground improvement methods are available?

Common methods include compaction, stabilisation, undercut and replacement, preloading and reinforced soil solutions. The right method depends on the soils, loads and site constraints, which the geotechnical assessment identifies.

Who designs the ground improvement solution?

A geotechnical engineer selects and designs the method based on site data. Soil Eng recommends and specifies ground improvement as part of its foundation and site solutions.

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