DISPLACEMENT OF DIAPHRAGM WALL FOR VERY DEEP BASEMENT EXCAVATION IN SOFT BANGKOK CLAY
Keywords:Deep basement, FEM analysis, Diaphragm wall, Lateral wall movement
Rosewood Hotel Project consists of 6 basements by using a diaphragm wall as a soil
protection system. Elevations of Rosewood Hotel basements are -2.9, -6.5 -9.25, -11.95, -14.65 and -18.9 m.
depth from the ground surface. Final excavation depth of this project is -24.2 m. from the ground surface
which is area intended for a lift pit. Due to the fact that the final depth of this project is very deep, the
effect of water pressure was also considered. Finite Element Method (FEM) was carried out to predict
behavior and displacement of the diaphragm wall which is used as a soil protection system. In
addition, the Mohr-Coulomb soil modeling was used as failure criteria of the FEM analysis. Measured
lateral movement of the diaphragm wall by means of inclinometer at all stages of construction was
compared with analytical results from FEM prediction. The predicted diaphragm wall displacement
by FEM agrees well with field performance.