Ground improvement is carried out for various objectives:
to improve bearing capacity and reduce settlement of soft ground, prevent earthquake liquefaction, control groundwater, stabilize excavation bottom
, prevent deformation of surrounding ground, or clean up contaminated ground.
What are the methods of ground improvement techniques?
- Dynamic Compaction.
- Jet Grouting.
- Deep Soil Mixing.
- Ground Freezing.
- Lime Stabilization.
- Prefabricated Vertical Drains (PVDs)
What is ground improvement technique?
Ground Improvement is the
application of various geotechnical techniques that are used to re-engineer existing soils to improve their engineering characteristics
. … Ground Improvement techniques may include Soil Stabilisation, Vibro Stone Columns, Jet Grouting, Deep Soil Mixing, Dynamic Compaction.
What are the different methods of ground improvement by reinforcement?
- Vibro Compaction.
- Vacuum Consolidation.
- Preloading of soil.
- Soil stabilization by heating or vitrification.
- Ground freezing.
- Vibro-replacement stone columns.
- Mechanically stabilized earth structures.
- Soil nailing.
What are the principles of ground improvement?
The objective of this course is for students to understand common ground improvement methods, including
densification and compaction
, preloading consolidation by prefabricated vertical drains, vacuum and electro-osmotic consolidation, physical and chemical stabilization, soil reinforcement and seepage and dewatering.
Which is the oldest method of ground improvement?
Dynamic compaction
is one of the oldest soil improvement methods known, reportedly used by the Romans prior to 100 ad and in the United States as early as the 1800s (Welsh, 1986).
Which techniques are used to reduce soil settlement?
reduce the expected settlement of soft soil. three techniques are
soil removal and replacement, preloading technique, and finally the vertical drains
.
What is grouting in ground improvement techniques?
1. Grouting is a
process of ground improvement attained by injecting fluid like material into subsurface soil or rock
. soil- cement to increase the strength.
What is ground treatment?
Ground Improvement or Ground treatment is defined as “
controlled alteration of the state, nature or mass behavior of ground materials to achieve an intended satisfactory response to existing or projected environmental and engineering actions
”
What are the different ground conditions?
The term ‘ground conditions’ usually refers to the
geology, hydrology, soil condition and any contamination of the ground on the site of a construction project
. Ground conditions may be man-made or naturally occurring, or a combination of the two.
What is stabilization in ground improvement techniques?
Soil stabilization aims
at improving soil strength and increasing resistance to softening by water through bonding the soil particles together
, water proofing the particles or combination of the two (Sherwood, 1993). Usually, the technology provides an alternative provision structural solution to a practical problem.
What is the role of ground improvement in foundation engineering?
Compaction techniques are increasingly used to
solve a wide range of foundation problems
and their scope now extends beyond the treatment of granular materials to include many silty or clayey soils.
What is Vibroflotation?
Vibroflotation is
a ground improvement technique used at a considerable depth
that by using a powered electrically or hydraulically probe, it strengthens the soil. … It involves the introduction of granular soil to form interlocking columns with surrounding soil.
What is vibro compaction?
Vibro Compaction is
an established ground improvement method for stabilising granular soils
such as loose sands, gravels and some hydraulic fills. The technique is primarily used for seismic mitigation and in-situ densification of loose sands up to 30m deep.
What is densification of soil?
Densification is
the process of increasing the density of something
. It is also known as compaction. This is a physical process that occurs naturally whereby sediments are compacted and combined.
What is deep compaction?
Dynamic compaction is
a ground improvement technique that uses a drop weight to densify loose soils
. Soil densification is carried out by the repeated, controlled impact of a heavy weight (10-40 tons) on the ground surface. Vibrations are generated for a considerable lateral distance.
