What are the forms of soil failure?

There are three types of soil failure, namely, overall shear failure (generally occurring in compacted sand), local shear failure (generally occurring in medium dense sand) and penetrating failure (generally occurring in loose sand).

The soil is not a combination of general soil layers, but a combination of soil layers related to the stability and deformation of engineering buildings. The soil is composed of several layers of soil with different thicknesses and different properties, which are combined together in a specific upper and lower order. After the Quaternary loose material is deposited into soil, the loose material that has not been subjected to the action of soil formation is subjected to compression and consolidation, and gradually forms a soil body with a certain strength and stability, which is the soil body mentioned in engineering geology, which is the object of human activities and engineering construction research.

and subjected to biochemistry.

and the soil formed by the physicochemical soiling process, which is called soil.

Soil failure refers to the overall destruction of the soil under the action of force. It depends on the grade of force and the strength of the soil. Strength refers to the maximum shear stress that a soil can withstand before it fails.

When the fractured surface of the soil can not bear greater additional stress, the maximum shear stress value at this time is the failure strength (or peak strength) of the soil. As the strain increases further, the stress gradually decreases, and the final stable value is called the residual strength (or final strength) of the soil. When the plastic failure of the soil occurs, the strain reaches the maximum value with the increase of stress, and then the strain continues to increase and the stress is almost unchanged.

Some soil (such as soft soil) may also not get the obvious stress maximum, and the strain still continues to increase with the stress, in this case, the stress value corresponding to a certain strain (such as taking 15) can only be obtained according to the allowable deformation value of the specific project as the failure strength. [1]

The extrusion and shearing of underground space, and the chain pressure of various substances in the underground produce a series of physical and mechanical chemical reactions, especially physical reactions.

There are three types of foundation soil failure, namely, overall shear failure (generally occurring in dense and pure dry sand), local shear failure (generally caverning in medium dense sand) and penetration failure (generally occurring in loose sand).

Summary. The relationship between soil deformation and failure is close. When a soil body is deformed, its strength and stability are affected, leading to failure.

Soil deformation can be caused by external forces (such as water pressure, **, wind force, etc.) or internal forces (such as infiltration, humidity, temperature, etc.). When the soil is subjected to an external force, it will undergo deformation, which will lead to failure. For example, it can cause deformation of the soil, which can lead to the destruction of the building.

In addition, when the soil body is subjected to internal forces, it also undergoes deformation, which leads to failure. For example, infiltration can cause deformation of the soil, which can lead to the destruction of buildings. Therefore, there is a close relationship between soil deformation and failure.

The relationship between soil deformation and failure is close. When a soil body is deformed, its strength and stability are affected, leading to failure. Soil deformation can be caused by external forces (such as water pressure, **, wind force, etc.) or internal forces (such as infiltration, humidity, temperature, etc.).

When the soil is subjected to an external force, it will undergo deformation, which will lead to failure. For example, it can cause deformation of the soil, which can lead to the destruction of the building. In addition, when the soil is subjected to internal forces, it will also undergo deformation, which will lead to destruction.

For example, infiltration can lead to deformation of free soil, which can lead to the destruction of building benches. Therefore, there is a close relationship between soil deformation and failure.

Fellow, I really didn't understand, I can be more specific.

There is a close connection between soil deformation and failure. When the soil is deformed, it leads to the destruction of the structure, which leads to the destruction of the knot bucket structure. There are many reasons for soil deformation, the most common of which is the change of groundwater level, which can lead to the deformation of the soil, which leads to the destruction of the structure.

In addition, **, settlement, leakage, etc. will also lead to soil deformation. There are many ways to solve the deformation and failure of the soil, among which the most commonly used method is to adopt the foundation transformation technology, that is, to apply a certain external force on the foundation to change the structure of the foundation, so as to reduce the deformation and damage of the earth bridge body. In addition, support technology can also be adopted, that is, a support structure is applied to the foundation to reduce soil deformation and damage.

Personal tip: In construction projects, effective measures should be taken to prevent soil deformation and damage, such as the use of ground sensitive Zhengji renovation technology and support technology, as well as the use of reasonable groundwater level management measures.

There are three kinds: one is the overall shear failure, the second is the local shear failure, and the third is the punching shear failure (also known as the penetration shear failure).

a) Mode of foundation failure Overall shear failure: triangular compacting area, forming a continuous sliding surface, extruded and uplifted on both sides, with two obvious inflection points. Solid foundation of dense sandy hard soil under shallow foundation.

b) Local shear failure mode of foundation failure: the plastic zone under the foundation is within a certain range of the foundation, the sliding surface does not extend to the ground, and the ground on both sides of the foundation is slightly uplifted, and there are no obvious cracks. It usually occurs in medium-dense sandy socks.

c) Penetration shear failure (punching and shear failure) of foundation failure: the soil layer under the foundation is compressed and deformed, the foundation sinks, and when the load continues to increase, the vertical shear failure occurs in the nearby soil.

The soil layer that serves as the foundation of a building is divided into rock, gravel soil, sand, silt, clayey soil and artificial fill. There are two types of foundations: natural foundations and artificial foundations (composite foundations). The natural foundation of the stool school is a natural soil layer that does not need to be reinforced by people.

Artificial foundations need to be reinforced, and there are stone chip cushions, sand cushions, mixed ash backfill and then tamping, etc.

3 types, overall shear failure, local shear failure, punching and shear failure.

a.Landslides on embankments.

b.Settlement of the sedan state base.

c.The foundation is unstable (bulging) in the sail rush

d.Sliding of retaining walls.

Correct answer: ACD