The primary purpose of a foundation is to safely transmit the weight of the structure to the underlying soil or rock, ensuring stability and preventing excessive settlement.

Pile foundations are typically employed for structures subjected to heavy loads and expansive soils due to their ability to transfer the load deep into the soil, bypassing weak or unstable soil layers.

The water table is the level below which the soil is saturated with water. Its depth is crucial for geotechnical engineers to consider when designing foundations and assessing soil stability.

The shear strength of soil is primarily determined by its cohesion and angle of internal friction. Cohesion represents the attractive forces between soil particles, while the angle of internal friction reflects the interlocking and frictional resistance between particles.

Soil compaction aims to increase the soil's density by reducing its void ratio, thereby improving its load-bearing capacity and reducing the risk of settlement.

Mat foundations and raft foundations are commonly used for structures built on soft or compressible soils due to their ability to distribute the load over a larger area, reducing the risk of excessive settlement.

The primary purpose of a footing is to distribute the load of the structure over a larger area of soil, reducing the pressure on the soil and minimizing the risk of settlement.

Caisson foundations are typically used for structures built over water or in marine environments. They consist of a hollow cylinder sunk into the soil and filled with concrete, providing a stable base for the structure.

The bearing capacity of soil is primarily determined by its type and composition, including factors such as particle size, shape, and mineralogy. Soil density and moisture content also play a role, but they are secondary to the soil's inherent characteristics.

Anchor foundations are specifically designed to resist uplift forces, such as those experienced by structures subjected to wind or water loads. They typically consist of a large concrete block or a series of piles anchored deep into the soil.

Retaining walls are primarily used to support and stabilize soil or rock slopes, preventing collapse and ensuring the stability of the surrounding area.

Stepped foundations are often used for structures built on sloping or uneven terrain. They consist of a series of steps or tiers, with each step providing a level surface for the construction of the structure.

Geogrids are used in foundation engineering to reinforce soil and improve its bearing capacity. They are typically made of high-strength polymeric materials and are placed within the soil to create a stable and reinforced foundation.

Machine foundations are specifically designed to support and isolate structures subjected to dynamic loads or vibrations, such as machinery or industrial equipment. They are typically constructed using reinforced concrete and incorporate vibration-damping mechanisms.

Dewatering systems are used in foundation engineering to remove excess water from soil and lower the water table. This is done to improve soil stability, reduce the risk of settlement, and facilitate construction activities.