In this paper, it is demonstrated that the shear strength of soil around jet grouting pile may be increased with the elapsed curing time of grouting cement. Because soil around pile initially experiences the disturbance due to the jet grouting work process, the soil gains the strength as grouting cement is cured and the soil is stabilized. In addition, excavation behaviour of marine clay at sheet pile wall and strut excavation site is analyzed using measured data from inclinometers, load cells, and strain gauges. The time to install supporting system and not only depth to but also area of excavation are very important factors for analyzing excavation behavior of soft marine clay
