Abstract: Within the same deep excavation site of Wanda Square in Yingkou, the horizontal displacements under different supporting systems are monitored and analyzed in this paper. The following conclusions are obtained: 1) In the soft soil areas, the linear horizontal displacement distribution is found in a high stiffness supporting system and a hyperbola distribution is observed in the low stiffness supporting system. 2) The maximum horizontal displacement of the deeper soils has a range of 2.0×10^-4 to 6.2×10^-4 of the excavation depth, which occurs at a zone of 0.7 to 1.0 of the excavation depth. 3) At the bottom of the excavation, two zones of heaving can be found: zone of heave increasing and zone of heave decrease with a heaving range of 3.5 to 10 ×10^-4 of excavation depth. The bottom heave increasing zone is approximately located within 0.4 time of the excavation depth. The stiffer the supporting is, the larger the heave increasing zone is.

Key words: Soft Soils, Deep Foundation Pit, Deep Horizontal Displacement, Bottom Heave