**5.4. High-pressure jet grouting**

High-pressure jet grouting is a ground improvement and soil stabilization method, where a stabilizing fluid is injected at a high velocity into the treated soil under a high pressure. The grouted fluid hardens within the soil, forming well-cemented jet grouted columns. Highpressure jet grouting is a very versatile foundation improvement method and has been used not only in building temporary cutoff wall for cofferdams (e.g., **Figure 1**), but also in treating deeply buried sand lenses within the overburden layers (e.g., **Figure 2**).
