What are common methods used for soil compaction?

The methods used for soil compaction involve techniques that effectively increase the density of soil, enhancing its ability to support structures and withstand environmental pressures. The correct answer includes rolling, tamping, vibratory compaction, and static pressure.

Rolling is commonly employed using large heavy rollers that apply weight over a broad area, which helps rearrange soil particles to fill voids and compact the ground. Tamping involves applying force to the soil through the use of a tamper or plate compactor, focusing on small areas to densify the material. Vibratory compaction utilizes mechanical vibrators that create rapid oscillations to effectively settle soil particles closer together, further increasing density. Lastly, static pressure refers to applying weight directly onto the soil; this method is effective for various soil types and conditions, ensuring the soil particles are compacted without the additional forces associated with dynamic methods.

This combination of methods is widely recognized in construction and earthwork as efficient ways to achieve the desired soil stability and load-bearing capacity. Other options include techniques that are either not primarily used for compaction or serve different purposes, which is why they do not belong to the most common methods for compacting soil effectively.