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T
tensar.co.uk
article
https://www.tensar.co.uk/resources/articles/ground-improvement
Weak or loose soils can limit the types of structures that can be built, or they can require costs and complex foundations to stabilise them. By using ground improvement techniques, the soil strength and stiffness can be improved, enhancing the overall load-bearing capacity. The outcome of this means engineers can design more efficient foundations while reducing the need for extensive excavation and reinforcement. Strengthening the soils and load-bearing capacity can also provide a more [...] Using specific techniques, such as chemical stabilisation or mechanically stabilised layers, can help distribute loads more evenly and control differential settlement. By tailoring the ground improvement method to the expected loading conditions, a more reliable foundation on site can be achieved – reducing the risk of structural distress over the life of the project.
### Maintenance and design life [...] Mechanical compaction is one of the most widely used ground improvement techniques and is typically applied to near-surface soils. It’s most effective in granular soils, such as sand and gravel, where compaction can significantly increase density. This method is commonly used in applications like road construction, embankments, and shallow foundations, as it improves the soil’s bearing capacity while reducing the risk of settlement.
### Soil stabilisation and reinforcement
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pilebuck.com
article
https://pilebuck.com/ground-improvement-design-methods-enhance-soil-performance
Jet grouting is a ground improvement technique that uses high-pressure jets to inject grout into the soil, creating soil-cement columns that enhance strength and stability. This method is effective for a wide range of soil types—including sands, silts, and clays. It is used for foundation support, excavation stabilization, and creating impermeable barriers for groundwater control. The benefits include increased soil strength, reduced permeability, and versatility in application for various soil [...] Ground improvement techniques encompass a variety of methods designed to enhance the engineering properties of soil and rock to meet specific project requirements. These techniques are employed to increase soil strength, reduce compressibility, and improve overall stability—making them crucial for the successful execution of construction projects. Common ground improvement methods include aggregate piers, rigid inclusions, stone columns, soil mixing, compaction grouting, permeation grouting, [...] In deep foundation construction, the stability and performance of the foundation system are paramount. Ground improvement plays a vital role in ensuring that the soil can adequately support the loads imposed by structures. By enhancing the mechanical properties of the ground—these techniques help mitigate risks associated with settlement, bearing capacity failures, and soil liquefaction. This is particularly important in challenging soil conditions where traditional foundation solutions may be
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advgeosolutions.com
article
https://www.advgeosolutions.com/understanding-the-basics-of-ground-improvemen…
Ground improvement techniques can include technologies such as deep dynamic compaction, jet grouting, cement deep soil mixing, stone columns, aggregate piers,
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geopier.com
article
https://www.geopier.com/resources/guides/ground-improvement
Ground improvement has many benefits including:
Increased bearing capacity
Decreased settlement
Liquefaction mitigation
Foundation stability
Minimal spoil
Less invasive/disruptive
Geopier Impact® System in action
## What are some ground improvement methods?
Ground modification encompasses a broad swath of remedial measures, but in general, the concepts mostly revolve around improving soils in place using mechanical or chemical means. A few variations are outlined below. [...] Rigid inclusion ground improvement serves as somewhat of a hybrid between aggregate piers and deep foundations. Rigid inclusions are generally very stiff, cementitious elements that transfer structural loads through weak soil layers and into competent bearing soils (much like a deep foundation). Rigid inclusions are installed by either drilling through or displacing the existing weak soils. The cemented nature of the rigid inclusion elements provides confinement and prevents bulging of the [...] Foundation improvement techniques suitable for most soil types and structures
Cost savings of 20 to 50 percent versus deep foundations and removal and replacement
Conventional spread footing and slab-on-grade design
Increased allowable bearing pressures (typically 4 to 10 ksf)
Reduced footing sizes and the associated concrete and steel cost
Excellent settlement control (total and differential)
Mitigation of liquefaction-induced settlements
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fhwa.dot.gov
official
https://www.fhwa.dot.gov/engineering/geotech/improvement
This technical area provides method and procedural guidance concerning the selection, design, performance, specification, installation, quality assurance/quality control, construction monitoring, and construction inspection associated with ground improvement techniques for transportation applications. Covered topics on ground improvement techniques include: grouting, vertical drains, stone columns, lightweight fills, vibro compaction, dynamic compaction, deep soil mixing, column supported [...] column supported embankments, soil nailing, MSE walls, and reinforced soil slopes. [...] U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
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U.S. Department of Transportation/Federal Highway Administration
U.S. Department of Transportation/Federal Highway Administration
# Bridges & Structures
## Ground Improvement
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nvlpubs.nist.gov
official
https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nistir5714.pdf
42 Remedial work involved replacement of the dam and treatment of the foundation by the dynamic compaction and in situ soil mixing techniques (Ryan and Jasperse, 1989; Taki and Yang, 199 1), Dynamic compaction was used to densify foundation soils to a depth of about 11 m where the center of the new dam would be. In situ soil mixing was used to treat foundation soils to a depth of 33 m where the upstream and downstream toes of the dam would be, as shown in Fig. 2.26. [...] It wa{believed that the looser zones could settle and liquefy as a result of seismic activity or exploding warheads.
The vibro-compaction, vibro-replacement, dynamic compaction and compaction grouting techniques were used to densify loose foundation soils to a depth of 15 m (Hussin and Ali, 1987). [...] As reported by Babasaki et al. (1991), in situ soil mixing was used to improve foundation soil conditions to a depth of 13.5 m, as illustrated in Fig. 2.30.
The design was verified through finite element numerical analysis and centrifuge model tests.
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keller-na.com
article
https://www.keller-na.com/expertise/solutions/ground-improvement
The mechanism of achieving ground improvement varies by technique and soil conditions. Densification using vibration or displacement is an effective means of improving granular soils. Reinforcement involves constructing or inserting stiff elements within a soil mass to create an improved composite material. Soil can be improved by adding cementitious materials, permeating granular soils, or mixing in all soil types. The insertion of vertical drains decreases the amount of time it takes soils to [...] parking lots, and runways. Lime/fly ash injection improves low-strength soils to improve the bearing capacity and/or trafficability of runways, landfills, and bridge approaches. Potassium chloride injection arrests heave occurring beneath existing structures by limiting the amount of water underlying clays can absorb. Keller has experience with the full range of ground improvement techniques. [...] Voids can cause overlying structures to settle. Compaction grouting, cement grouting, polyurethane grouting, and other specialized grouting techniques permanently fill voids. Keller has experience with the full range of void-filling techniques to stop mine subsidence and stabilize sinkholes.
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subsurfaceconstructors.com
article
https://www.subsurfaceconstructors.com/services/ground-improvement
The most prevalent method in the U.S. is aggregate piers, which are typically installed using either a vibratory or a ramming technique to compact the stone.Read more