Analysis Of The Influence Of Foundation Pit Excavation On Adjacent Buildings Of A Metro Station In Shijiazhuang City

Urban upper space land is becoming more and more tight,so the construction of subway develops rapidly,but the construction of subway often needs to excavate deep foundation pit,not only to ensure the stability of excavation in more complex geology,but also to reduce the influence of excavation on the surrounding existing buildings.Based on this,the paper analyzes the horizontal displacement of the underground continuous wall and the surrounding area of the foundation pit by using Midas GTS NX rock and soil analysis software.The variation of surface settlement,pit heave and building settlement.The main contents and conclusions are as follows:(1)The features of geomorphology,rock and soil layer and surrounding hydrogeology in the site are analyzed,and the surrounding environment of foundation pit engineering and the structural form of adjacent buildings are investigated in detail.(2)Using Midas GTS NX rock analysis software,the model which can truly reflect the actual project is established,so as to analyze the horizontal displacement of the underground continuous wall caused by the excavation of the foundation pit,the surface subsidence around the foundation pit,the uplift of the pit bottom and the settlement of the building.The results show that: after excavation of the foundation pit,the maximum horizontal displacement of the underground continuous wall on one side of the adjacent building is 21.92 mm,and the maximum horizontal displacement of the underground continuous wall on the other side of the building is 19.15 mm.The surrounding surface subsidence of one side of the adjacent building is 19.36 mm,and that of one side of the building is 16.66 mm.The maximum elevation of the bottom of the pit is 55.34 mm.The maximum settlement of the building is 14.46 mm.(3)By changing the thickness of the underground continuous wall,the stiffness of the underground continuous wall and the buried depth of the underground continuous wall,the influence of soil movement and the indirect influence on the settlement of the building in the process of foundation pit construction are studied.Find out the law of change and give some powerful guidance to the actual project.