What is soil compaction? Soil compaction is the process in which stress applied to a soil causes densification as air is displaced from the pores between the soil grains Heavily compacted soils contain few large pores, less total pore volume and, consequently, a greater density. A compacted soil has a reduced rate of both water infiltration and drainage. The method of compaction is primarily of four types such as kneading, static, dynamic or impact and vibratory compaction @5_pillars_constructio