Analysis On Mutual Influence Of Multiple Foundation Pits Joint Excavation For Deep Soft Ground

As an inseparable part of urban construction,underground space is constantly innovating in width and depth,and we also needs to face complex geological conditions and ground conditions in construction.Based on the foundation pit of Zhuhai Haoyi Fortune Center project,this paper analyzes the deformation characteristics of multi-base pits alongside for deep soft ground.The main research content and conclusion:The lateral deformation of a single foundation pit and joint excavation of multiple foundation pits are calculated and compared respectively by studying the relevant theories of lateral deformation of foundation pits.The results show that when multiple foundation pits are excavated together,the deformation of the outer wall of the foundation pit has a negative correlation with the stiffness of the common diaphragm wall and its internal supports on both sides,and a positive correlation with the adjacent spacing of the internal supports on both sides of the common diaphragm wall.And through the finite element software to carry on the numerical simulation analysis,the numerical result conforms to the analysis result.The Midas GTS finite element analysis software is used to carry out numerical simulation analysis on the foundation pit.The results show that the more existing foundation pits adjacent to each other,the larger the deformation of the outer wall and the surrounding settlement of the foundation pit.For the common diaphragm wall,the deformation and settlement are the smallest when there is only one adjacent foundation pit.When there are multiple foundation pits side by side,the deformation and settlement will increase instead.When three foundation pits are excavated simultaneously,the earlier the foundation pits on both sides are excavated at the same time and the later the middle foundation pit is excavated,which will cause the deformation of the outer wall of the foundation pit and the smaller the settlement of the surrounding soil.On the other hand,the greater the deformation of the common diaphragm wall.