Describe the Acceleration of the Soil Improvement Process.
Describe the Acceleration of the Soil Improvement Process.
The soil improvement processes are as follows:
Dry soil mixing:
It is a ground improvement technique that improves soft, high moisture clays, peats, and other weak soils, by mechanically mixing them with dry cementitious binder to create soilcrete. To construct columns, a high-speed drill advances into the ground a drill rod with radial mixing paddles near the bottom of the drill string. During penetration, the tool shears the soils to prepare them for mixing. After the tool reaches the design depth, the binder is pumped pneumatically through the drill steel to the tool, where it is mixed with the soil as the tool is withdrawn.
The dry soil mixing process constructs individual soilcrete columns, rows of overlapping columns, or 100% mass stabilization, all with a designed strength and stiffness. Dry soil mixing is low vibration, quiet, clean, and uses readily available materials. This process is often used in high groundwater conditions and has the advantage of creating almost no spoil for disposal.
Dry soil mixing is best for soils with moisture contents greater than 60 percent and near the liquid limit. Soft cohesive soils, including organics, are usually targeted as other soil types can often be treated more economically with other techniques.
Wet soil mixing :
It is a method to improves the characteristics of weak soils by mechanically mixing them with cementitious binder slurry. wet soil mixing design and construction experience for both static and seismic loading.
Wet soil mixing is also known as the Deep Mixing Method. A powerful drill advances a mixing tool as binder slurry is pumped through the connecting drill steel, mixing the soil to the target depth. Additional mixing of the soil is completed as the tool is withdrawn to the surface. Mass wet soil mixing, or mass stabilization, is performed with a horizontal axis rotary mixing tool at the end of a track hoe arm. The binder slurry is injected through a feed pipe attached to the arm.
This process constructs individual soilcrete columns, rows of overlapping columns or 100% mass stabilization, all with a designed strength and stiffness.
Wet soil mixing is used in nearly any soil type, including organics. If the moisture content is greater than 60%, dry soil mixing may be more economical. The ease of mixing depends on the soil type, strength, water content, plasticity, stratigraphy, and texture. With wet soil mixing, treatment is possible to depths up to 100 feet. Excess soilcrete generated may range from 10 to 40% of the treated volume and has been re-purposed as structural fill. Stiff soils and obstructions are sometimes pre-drilled ahead of the soil mixing process.
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