What is densification of soil?
Densification or compaction methods involve rearranging the soil particles into a tighter configuration, resulting in increased density. This increases the shear strength and liquefaction resistance of the soil.
What is densification of granular soil?
The reclamation of new land with hydraulic fill results in a loose profile of granular soil mass. This loose granular soil will contribute to high elastic immediate settlement as well as liquefaction upon dynamic forces. Generally, granular soil with less than 10% of fine can be densified with this method.
What are the principles of soil densification?
Densification of soils during construction of embankments and subgrades is achieved by compaction. Higher density of embankments and subgrades is achieved by compacting the soil by rollers usually in layers, known as lifts.
What are the methods of soil improvement?
Soil Improvement. The main goal of most soil improvement techniques used for reducing liquefaction hazards is to avoid large increases in pore water pressure during earthquake shaking. This can be achieved by densification of the soil and/or improvement of its drainage capacity.
What is meant by densification?
Definitions of densification. an increase in the density of something. synonyms: compaction, compression, concretion. type of: concentration. increase in density.
What is optimum moisture content of soil?
Optimum Moisture Content (OMC) is the water content at which the soil attains maximum dry density. Maximum Dry Density (MDD) is the dry density of soil corresponding to Optimum Moisture Content.
What is improvement soil?
Soil improvement is an alternative considered when the natural soil does not meet the engineering requirements for a project. As an example, if the soil is too weak to carry the structure on a shallow foundation, two alternatives exist: deep foundations or soil improvement plus a shallow foundation.
How do you improve soil properties explain the improvement methods?
How to Improve Soil Properties
- Surface Compaction.
- Drainage Methods.
- Vibration Methods.
- Pre-Compression and Consolidation.
- Grouting and Injection.
- Chemical Stabilization.
- Soil Reinforcement.
- Geotextiles and Geomembranes.
What is densification in biomass?
Densification is suggested as a means to convert biomass/plastic into briquettes or pellets with volumetric energy density comparable to coal, because both biomass and plastic wastes have low volumetric density, which is not suitable for transportation, storage and combustion as fuels.
How does liquefaction occur in soil?
Soil liquefaction occurs when a cohesionless saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid.
When to use in situ soil densification method?
Rearrangement of the soil structure from a loose to the dense state by applying Shock and Vibration called in-situ soil densification. This method is applicable only for cohesionless soil under high water table condition; where the depth of treatment may be beyond 30.00m.
What’s the best way to densify granular soil?
Generally, granular soil with less than 10% of fine can be densified with this method. There are a few methods of deep comp action. Among these, (i) dynamic compaction, (ii) vibroflotation, and (iii) compaction piles are the methods most commonly used in densification of granular soils.
How is dynamic compaction used in soil densification?
Dynamic compaction is a technique used for in-situ densification of granular soil deposits by heavy impact. This technique primarily involves dropping a heavy weight repeatedly on the ground surface at a regular grid of impact points.
Which is a new technique for soil improvement?
A new dynamic compaction technique which makes use o f the free fall energy as well as rotational energy of the tamper called Rotational Dynamic Compaction (RDC). The technique increases depth of improvement in granular soils.