Analysis On The Influence Of Construction Of Foundation Pit Excavation On Adjacent Building In XEDA Sci-tech Park

In this paper,the problem of how to choose the supporting structure is to be solved relying on the foundation pit engineering of XEDA New Industrial Park and aiming at the influence of foundation excavation on its adjacent constructions.The influence of different working conditions on the adjacent constructions,such as the different excavation depth of the foundation pit,the different distance of the constructions from the foundation pit,the different excavation width of the foundation pit and the reinforcement measures are studied respectively by making simulation of threedimension and twodimension with the software ABAQUS,meanwhile,the actual monitoring data has been analyzed.The results are as follows:(1)In comparison of model simulation and the actual monitoring data,with the increase of the width and depth of foundation pit excavation,there will be a gradually increase in horizontal displacement,vertical displacement and tilt rate in nearby constructions.The less distance to the foundation pit is,the greater vertical displacement will be.The simulation results are consistent with the actual monitoring data.(2)Among the factors of foundation pit excavation: there is a positive correlation between depth and width of foundation pit excavation and variation of adjacent constructions;when the distance between the adjacent constructions and the foundation pit is less than three times of the depth of the foundation pit,vertical displacement increases with the decrease of distance from the foundation pit.The actual monitoring data is 1.07 to 1.15 times larger than the simulated data.(3)In the reinforcement measures of foundation pit: the influence from the excavation to adjacent constructions will be slow down with the increase of thickness of underground diaphragm wall,internal support of concrete and reinforcement of soil outside the foundation pit.However,with the increase of thickness of underground diaphragm wall,the influence of reinforcement effect will be decreased.(4)Through the simulation analysis of the foundation pit reinforcement measures,the project construction support system adopts the four reinforced concrete support + underground diaphragm wall support form,instead of the soil reinforcement measure.Proof by facts,the system ensures the safety of the pit itself and the constructions nearby.As a result,there is a guiding significancefor the analysis of foundation pit reinforcement measures by using a finite element simulationwith the software ABAQUS.It has obvious effect on reducing the influence of foundation pit excavation on adjacent constructions when usingconcrete support,underground diaphragm wall,and soil reinforcement.