"How does soil compaction influence the stability and load$-$bearing capacity of civil engineering structures? Explain the process of soil compaction and its importance in construction projects. Discuss the factors affecting soil compaction, such as moisture content, compaction effort, and soil type. Illustrate the relationship between compaction and various properties of soil, including density, porosity, and shear strength. Provide examples of how improper compaction can lead to structural failures and suggest methods to ensure adequate compaction for different types of soil and project requirements."