Ground improvement techniques are methods used in civil engineering projects to enhance the properties of soil or rock mass to support structures or mitigate potential hazards. Here's a brief overview of ground improvement techniques:

Soil Compaction: Soil compaction involves increasing the density of soil by mechanically applying pressure to reduce air voids and improve load$-$bearing capacity. This technique is commonly used for road construction, embankments, and building foundations.

Grouting: Grouting involves injecting a cementitious or chemical grout into the soil under pressure to fill voids, fissures, and fractures, improving soil stability and reducing permeability. Grouting is effective for stabilizing loose or sandy soil and mitigating groundwater seepage.

Vibro Compaction: Vibro compaction uses vibratory probes to densify loose or granular soils by rearranging soil particles and reducing void spaces. This technique is particularly effective for improving the bearing capacity of cohesionless soils and mitigating liquefaction potential.

Stone Columns: Stone columns, also known as granular or vibro stone columns, involve installing compacted stone or aggregate columns into the ground to improve load$-$bearing capacity and reduce settlement. Stone columns are commonly used in soft or loose soils.

Deep Soil Mixing: Deep soil mixing involves mechanically mixing cement or lime with in$-$situ soil to improve its engineering properties. This technique enhances soil strength, reduces compressibility, and increases stability, making it suitable for supporting heavy structures on weak soils.

Now, here's an objective type question based on the information provided:

Question: Which ground improvement technique involves injecting a cementitious or chemical grout into the soil to fill voids and improve stability?

A$)$ Soil Compaction

B$)$ Vibro Compaction

C$)$ Grouting

D$)$ Stone Columns