There are two types of jet grout columns:
1. Single fluid jet grout column: In this method, a single fluid (usually water or grout) is injected at high pressure through the nozzle of the jet grouter. The fluid mixes with the soil or rock, forming a column of grouted soil or rock.
2. Double fluid jet grout column: In this method, two fluids are injected simultaneously through the nozzle of the jet grouter. One fluid is usually water, and the other is usually cement or grout. The fluids mix at the nozzle and are injected into the soil or rock, forming a column of grouted soil or rock. This method improves the performance of the jet grout column by providing greater strength and durability.
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