Foundation Design in Soils Susceptible to Wetting

Foundation design in soils that are susceptible to wetting requires careful consideration and implementation of specific techniques. When the upper layer of soil is at risk of becoming wet and collapsing after construction, engineers must take steps to ensure the stability and durability of the foundation. One technique that can be employed is the moistening and recompaction of the soil using heavy rollers. If the expected depth of wetting is around 1.5-2 meters (approximately 5-6.5 feet) from the ground surface, the soil can be moistened and then compacted using heavy rollers. This allows for the construction of spread footings and rafts on the compacted soil. Another method, known as heavy tamping or dynamic consolidation, involves repeatedly dropping a heavy weight on the ground. The stress waves generated by the hammer drop help in the densification of the soil, providing a stable foundation. In some cases, foundation trenches can be flooded with solutions of sodium silicate and calcium chloride. This chemical treatment can help stabilize the soil and prevent it from becoming saturated and collapsing. However, this technique is only suitable when conditions are favorable. It is important to note that foundation design in soils susceptible to wetting requires a thorough understanding of the soil properties and the potential risks involved. Engineers must carefully assess the site conditions and choose the most appropriate design techniques to ensure the long-term stability and safety of the foundation. By implementing these design techniques, engineers can mitigate the risks associated with wetting in soils and ensure the durability and stability of the foundation. It is crucial to consider these factors during the planning and construction phases to avoid costly repairs and potential structural failures in the future. In conclusion, foundation design in soils susceptible to wetting requires careful consideration and implementation of specific techniques. Moistening and recompaction using heavy rollers, as well as chemical treatments, can help stabilize the soil and ensure the stability of the foundation. Engineers must assess the site conditions and choose the most appropriate design techniques to mitigate the risks associated with wetting. By doing so, they can ensure the long-term durability and safety of the foundation.