Deep foundation

Deep foundation is a type of foundation located deep in the soil layer with high bearing capacity, and its burial depth is greater than 5m. Common types of deep foundations include pile foundations, underground continuous walls, pier foundations, and caissons. The main function of deep foundation is to transfer the load it bears relatively concentrared to the deep layers of the foundation, in order to adapt to complex geological conditions and high load requirements.

Deep foundations are typically adopted in the following situations:

1.The soil conditions lack necessary supporting foundations, that is, the soil conditions near the bottom of the building, do not allow the use of conventional shallow foundations.

2. Deep foundations need to bear heavy loads, such as high-rise buildings, large-span structures, large volume concrete, or brick and stone buildings.

3. There is a potential risk of instability on the ground, such as soil erosion, sinking, sliding, decomposition, and other changes.

4. For buildings with high sensitivity to settlement, the settlement of deep foundations is relatively small, especially when the foundation is set on rocks or high consolidation soil layers.

Deep foundation has some obvious advantages, such as high bearing capacity, good stability, and the ability to adapt to various geological conditions. However, the construction of deep foundation is relatively complex, difficult, and costly.Therefore, when choosing whether to use deep foundations, it is necessary to comprehensively consider factors such as geological conditions, soil conditions, weight of buildings, purpose of use, environmental requirements, as well as economic and technical feasibility.

Overall, deep foundation is an important form of civil engineering, especially in dealing with complex geological conditions and heavy load requirements, which has significant advantages. However, due to its construction complexity and high cost, it is necessary to choose and apply it according to the actual situation in specific projects.