REDUCING THE HORIZONTAL DISPLACEMENT OF THE DIAPHRAGM WALL BY THE ACTIVE SUPPORT SYSTEM IN HANOI

Abstract

: In recent years, Vietnam has had many construction incidents related to deep excavation construction. Notably, the incidents of constructing the underground of a high-rise building such as the excavation collapsing, subsidence of the ground around the deep excavation, diaphragm walls move significantly beyond the allowable value, etc. Construction solutions, which can stabilize the deep excavation and reduce the displacement of diaphragm walls, are very important and extremely necessary. The paper presents the effect of the increasing load from the strut system by hydraulic jack (active support system) to the Barrette wall displacement during the construction of the deep excavation. In this study, a numerical investigation was performed to evaluate the effect of the active support system on the Barrette wall displacement corresponding to each case of 2 to 3 basements for each type of natural ground in Hanoi city. In particular, the Finite Element Model (FEM) simulated the construction sequence of deep excavation with different forces from struts has been compared. The analysis results show that the active support system is an effective solution to stabilize the deep excavation and reduce the horizontal displacement of the Barrette wall, especially the top and the middle of the Barrette wall.