Ground improvement techniques - Revision history

Editor at 15:13, 16 September 2021

2021-09-16T15:13:15Z

← Older revision		Revision as of 15:13, 16 September 2021
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	* Bearing capacity.		* Bearing capacity.
		+	* Biosolids.
	* Building on fill.		* Building on fill.
	* Enabling works.		* Enabling works.

Designing Buildings at 14:11, 12 October 2020

2020-10-12T14:11:27Z

← Older revision		Revision as of 14:11, 12 October 2020
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	* Types of soil.		* Types of soil.

−	[[Category:Construction_techniques]] [[Category:Roles_/_services]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Construction_techniques]] [[Category:Roles_/_services]]

Designing Buildings at 16:04, 18 January 2019

2019-01-18T16:04:58Z

← Older revision		Revision as of 16:04, 18 January 2019
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	* Bearing capacity.		* Bearing capacity.
	* Building on fill.		* Building on fill.
−	* Contaminated land.
	* Enabling works.		* Enabling works.
	* Excavation.		* Excavation.
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	* Groundworks.		* Groundworks.
	* Insitu testing of soils.		* Insitu testing of soils.
−	* Site appraisals.
	* Settlement.		* Settlement.
		+	* Soil compaction.
	* Soil report.		* Soil report.
	* Soil treatment.		* Soil treatment.

Designing Buildings at 16:02, 18 January 2019

2019-01-18T16:02:35Z

← Older revision		Revision as of 16:02, 18 January 2019
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	Soil compaction produces an increase in soil density and a decrease in air volume without producing a decrease in water content. It can improve shear strength, stiffness, bearing capacity and stability, reducing settlement and frost heave. This may be necessary in the construction of bases for highways, embankments and so on, or to create a suitable level base for the construction of a building. Existing soil can be compacted, or layers of new soil can be compacted, taking a site to the required level.		Soil compaction produces an increase in soil density and a decrease in air volume without producing a decrease in water content. It can improve shear strength, stiffness, bearing capacity and stability, reducing settlement and frost heave. This may be necessary in the construction of bases for highways, embankments and so on, or to create a suitable level base for the construction of a building. Existing soil can be compacted, or layers of new soil can be compacted, taking a site to the required level.

−	For more information see: Soil ~~compation~~.	+	For more information see: Soil compaction.

	= Vibro-replacement =		= Vibro-replacement =

Designing Buildings at 16:02, 18 January 2019

2019-01-18T16:02:19Z

← Older revision		Revision as of 16:02, 18 January 2019
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	Soil mixing improves soft clays, peats and other weak soils with a high moisture content. It involves mechanically mixing the wet soils with a dry cementitious binder to create soilcrete. This helps increase bearing capacity and decrease settlement.		Soil mixing improves soft clays, peats and other weak soils with a high moisture content. It involves mechanically mixing the wet soils with a dry cementitious binder to create soilcrete. This helps increase bearing capacity and decrease settlement.

−	= ~~Dynamic~~ compaction =	+	= Soil compaction =

−	~~Dynamic~~ compaction ~~densifies granular soils~~ and ~~fill materials by using the energy from~~ a ~~drop weight~~. ~~This is usually steel~~, ~~which is lifted by a crane~~ and ~~repeatedly dropped~~. ~~The soils are improved at depth by~~ the ~~vibrations transmitted. The locations~~ for ~~dropping are arranged~~ on ~~a grid pattern~~, ~~with the spacing between them determined by~~ the ~~geometry~~ of ~~the site~~, the ~~subsurface conditions and the intended loading~~.	+	Soil compaction produces an increase in soil density and a decrease in air volume without producing a decrease in water content. It can improve shear strength, stiffness, bearing capacity and stability, reducing settlement and frost heave. This may be necessary in the construction of bases for highways, embankments and so on, or to create a suitable level base for the construction of a building. Existing soil can be compacted, or layers of new soil can be compacted, taking a site to the required level.

−	~~= Vibro compaction =~~	+	For more information see: Soil compation.
−		+
−	This technique is used to densify clean granular soils. It works by using a vibrator suspended from a crane to penetrate to the design depth. Water jetting is often used to aid penetration. The energy of the vibrations reduces the forces acting between the soil particles which allows them to become denser.	+
−		+
−	For more information, see ~~Vibro compaction~~.	+

	= Vibro-replacement =		= Vibro-replacement =
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	For more information, see Vibro-replacement.		For more information, see Vibro-replacement.
−
−	~~= Rapid impact compaction =~~
−
−	~~This technique uses a hydraulic hammer to repeatedly strike an impact plate and densify shallow, granular soils by rearranging the particles into a denser formation.~~

	= Geotextiles =		= Geotextiles =

Editor at 12:34, 29 November 2018

2018-11-29T12:34:38Z

← Older revision		Revision as of 12:34, 29 November 2018
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	This involves the addition of a binder product such as hydrated lime or quicklime to soil which reduces moisture and improves stability.		This involves the addition of a binder product such as hydrated lime or quicklime to soil which reduces moisture and improves stability.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Bearing capacity.		* Bearing capacity.
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	* Soil report.		* Soil report.
	* Soil treatment.		* Soil treatment.
		+	* Trial pit.
	* Types of soil.		* Types of soil.

	[[Category:Construction_techniques]] [[Category:Roles_/_services]]		[[Category:Construction_techniques]] [[Category:Roles_/_services]]

Designing Buildings at 15:34, 16 May 2018

2018-05-16T15:34:32Z

← Older revision		Revision as of 15:34, 16 May 2018
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	= Vibro-replacement =		= Vibro-replacement =

−	Vibro-replacement is a ~~ground improvement technique that can be used~~ to ~~transfer structural loads to suitable levels in poor ground conditions~~. Another term that can be used for this technique is vibro stone columns (VSC)~~. The effect of vibration consolidates and strengthens the ground, helping to stabilise granular soils that would otherwise be unsuitable for construction~~.	+	Vibro-replacement works by using a crane-suspended downhole vibrator to construct stone columns through weak soils, improving their load-bearing and settlement capacities. Another term that can be used for this technique is vibro stone columns (VSC).

	For more information, see Vibro-replacement.		For more information, see Vibro-replacement.

Designing Buildings at 15:33, 16 May 2018

2018-05-16T15:33:19Z

← Older revision		Revision as of 15:33, 16 May 2018
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	= Introduction =		= Introduction =

−	There are a number of ground improvement or modification techniques that can be used to stabilise or improve the condition of an area of ground before construction work takes place. ~~By altering the nature of~~ the ground ~~in situ, the~~ shear strength, stiffness, permeability, and so on~~, can be improved~~.	+	There are a number of ground improvement or ground modification techniques that can be used to stabilise or improve the condition of an area of ground before construction work takes place. This may be necessary to improve or modify the ground shear strength, stiffness, permeability, and so on.

	Some of the most techniques include:		Some of the most techniques include:
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	Jet grouting uses high velocity fluid jets to construct cemented soil and is commonly used to underpin foundations and provide excavation support.		Jet grouting uses high velocity fluid jets to construct cemented soil and is commonly used to underpin foundations and provide excavation support.

−	Chemical grouting uses a low viscosity, non-particulate grout to permeate pore spaces in granular soils and ~~harden~~ to create a cemented mass.	+	Chemical grouting uses a low viscosity, non-particulate grout to permeate pore spaces in granular soils and hardens to create a cemented mass.

	For more information, see Grouting in civil engineering.		For more information, see Grouting in civil engineering.
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	= Dynamic compaction =		= Dynamic compaction =

−	Dynamic compaction densifies granular soils and fill materials by using the energy from a drop weight. This is usually steel, which is lifted by a crane and repeatedly dropped. The soils are improved at depth by the vibrations transmitted. The locations for dropping are arranged on a grid pattern, with the spacing between them determined by the geometry of the site, the subsurface conditions and the intended ~~foundation~~ loading.	+	Dynamic compaction densifies granular soils and fill materials by using the energy from a drop weight. This is usually steel, which is lifted by a crane and repeatedly dropped. The soils are improved at depth by the vibrations transmitted. The locations for dropping are arranged on a grid pattern, with the spacing between them determined by the geometry of the site, the subsurface conditions and the intended loading.

	= Vibro compaction =		= Vibro compaction =

Editor at 15:03, 3 May 2018

2018-05-03T15:03:14Z

← Older revision		Revision as of 15:03, 3 May 2018
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	* Building on fill.		* Building on fill.
	* Contaminated land.		* Contaminated land.
		+	* Enabling works.
	* Excavation.		* Excavation.
	* Geophysical survey.		* Geophysical survey.

Editor at 15:02, 3 May 2018

2018-05-03T15:02:48Z

← Older revision		Revision as of 15:02, 3 May 2018
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	* Settlement.		* Settlement.
	* Soil report.		* Soil report.
		+	* Soil treatment.
	* Types of soil.		* Types of soil.

	[[Category:Construction_techniques]] [[Category:Roles_/_services]]		[[Category:Construction_techniques]] [[Category:Roles_/_services]]