$2020\mathrm{.}3.$#"How do soil properties affect the stability of foundations in civil engineering projects, and what methods can be employed to mitigate risks associated with poor soil conditions? Explore the role of soil types, compaction, and moisture content in determining foundation integrity. Additionally, discuss common foundation types such as shallow and deep foundations, and their suitability in different soil conditions. Lastly, analyze the importance of soil investigation techniques in ensuring the durability and safety of civil structures."