Foundation treatmentIt is to adopt various treatment methods to improve the foundation condition (deformation or permeability properties) and increase the bearing capacity of the foundation.
The problems of natural foundation are as follows: bearing capacity and stability; Compression and non-uniform settlement; The problem of leakage; Liquefaction problem; Special problems with special soils.
When the natural foundation has one or several of the above five problems, the foundation treatment measures should be adopted to ensure the safety and normal use of the superstructure. The main purposes of foundation treatment are:
(1)Improve the bearing capacity of foundation soil
The concrete manifestation of foundation shear failure is that the foundation bearing capacity of the building is not enough, and the structure is unstable due to eccentric load or lateral earth pressure. Uplift of adjacent foundations due to soil filling or building load; The slope is unstable when earthwork is excavated, and the bottom of pit is raised when foundation pit is excavated. The shear failure of foundation soil is mainly due to the lack of shear strength of foundation soil. Therefore, in order to prevent shear failure, some measures should be taken to improve the shear strength of foundation soil.
(2)Reduce the compressibility of the foundation soil
The compressibility of foundation is manifested in the large settlement and differential settlement of buildings, while the compressibility of soil is related to the compression modulus of soil. Therefore, measures must be taken to increase the compression modulus of foundation soil to reduce the settlement and uneven settlement of foundation.
(3)Improve the permeability of the foundation
In the construction of foundation pit, piping or flowing sand is produced due to the thin silt or silt in the soil layer, which are all problems caused by the movement of groundwater in the soil. Therefore, measures must be taken to reduce the permeability of foundation soil or its hydrodynamic pressure.
(4)Improve the dynamic characteristics of foundation soil
Saturated with loose fine sand(Including some silt)Liquefaction will occur under the action of earthquake, and vibration of the nearby foundation will drop when bearing traffic load and pile driving, which are the performance of the dynamic characteristics of soil. The purpose of foundation treatment is to improve the dynamic characteristics of soil and improve the vibration resistance of soil.
(5)Improve the poor foundation characteristics of special soil
For collapsible loess and expansive soil, it is to eliminate or reduce the collapsibility of loess or the expansion and contraction of expansive soil. Other special soils, such as soft soil, red clay, frozen soil and so on have different foundation treatment methods.
for Foundation treatmentIn order to achieve the above one or several purposes, the foundation treatment method should be selected according to the comprehensive factors such as geological conditions and economic conditions.
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