What Is Silt?

Mud is a Chinese vocabulary, also known as silt, pronounced y ní, which refers to fine-grained soil that is deposited in still water and a slow flowing water environment and contains organic matter. The Southern Dynasty and Emperor Liang Wu's "Jingye Fu" have related records.

[y ní]

silt

y ní

[mud]: Refers to fine-grained soil that is deposited and contains organic matter in still water and slow flowing water environments. Its natural water content is greater than the liquid limit, and its natural porosity is greater than 1.5. When the natural porosity is less than 1.5 and greater than 1.0, it is called silty soil.

[sludge]: Also known as sludge. A solid-liquid mixture containing a small amount of liquid, such as slime, sludge or muddy, formed by sedimentation and sedimentation of solid particles suspended in a slurry (a thick suspension of solid particles dispersed in a liquid).

[ooze; slurry]: See "

Still sludge.

Southern Dynasty ·

Unconsolidated weak fine-grained or extremely fine-grained soil that is deposited in still water or a slow flowing water environment and formed by physical and chemical reactions. Is a modern recent sediment. The silt composition can be silty or clay based on particle size, and fine sand or very fine sand is rare. The clay minerals of the beach sludge are mainly illite and montmorillonite, while the freshwater sludge is mainly illite and kaolinite. The sludge contains more (2 to 3%) and more (10 to 12%) organic matter, and its content decreases with depth.

The main characteristics of the sludge are: the natural water content is higher than the liquid limit, and the porosity is more than 1.0; the dry density is small, only 0.8 0.9 g / cm3; the compressibility is particularly high, and the pressure increases from 9.8 × 10 Pa to 19.6 × 10 Pa When the compression coefficient is a1-2> 0.05, the compression coefficient a1-3> 0.1 when the pressure increases from 9.8 × 10 Pa to 29.4 × 10 Pa; the strength is extremely low, it is often in a flowing state, and it is regarded as a weak foundation. The silt can be further subdivided into silt (the porosity is greater than 1.5) and silty soil (the porosity is 1 to 1.5) according to the porosity.

The natural structure of the silt is very sensitive to changes. The structure and its strength can be automatically restored after being damaged by force. This is called thixotropy. Silt should not be used as a natural foundation, because it will produce uneven settlement, which will cause the building to crack, tilt, and affect normal use. Manual reinforcement measures must be taken when building on silt. Such as compaction, compaction, drainage with vertical sand wells to accelerate silt consolidation. Sometimes, column foundations or structural measures such as rigid ring beams and settlement joints adapted to uneven settlement can be used on the upper part of the building to ensure the stability and safety of the building.