Numerical Simulation And Analysis Of Deep Foundation Pit Support For Engineering Building Of A University In Coastal Area

Foundation pit engineering is a complex and systematic project,which has many factors affecting its stability and safety.At present,the projects of deep foundation pit in our country are increasing year by year,and there are more and more problems in the design and construction of deep foundation pit support.In the process of excavation,we not only need to ensure the stability of the foundation pit itself,but also need to ensure the safety of the adjacent buildings and underground pipelines in the adjacent area,so in the process of engineering practice,the theory of deep foundation pit support design needs to be further improved.On the one hand,considering the safety problem too conservatively will increase investment and cause unnecessary waste;on the other hand,lowering the safety standard of foundation pit works will reduce the investment,but it will probably cause irreparable engineering accidents.Therefore,many factors need to be considered in the selection of foundation pit support mode.Taking the deep foundation pit engineering of a university engineering building in Binhai as an example,this paper compares several common foundation pit support methods,analyzes their advantages and disadvantages and their applicable scope,and combines the geological conditions of the site itself,and finally selects the pile-anchor support structure.The pile-anchor support structure is compared with other supporting structures.Not only can the small construction space be used effectively,but also the formation deformation can be effectively controlled.Therefore,it is widely used in foundation pit engineering.First,Lizheng 7.0 software to design a University Engineering building foundation pit 1-1 side pile anchor bracing engineering design.The shear stress curve of supporting pile is obtained,Lateral displacement curve of foundation pit,Settlement Curve of soil around Foundation Pit and Distribution of Earth pressure;Then the numerical model is established by FLAC3 D software,the excavation and support scheme of foundation pit is simulated and analyzed,tress distribution of soil around foundation pit,cable axial force distribution,the settlement of soil around the foundation pit and the variation of horizontal displacement during excavation are obtained.Finally,the design value,the monitoring value and the FLAC3 D simulation value are compared,and the law of change is summarized.Through comparative analysis,we can see that the type of support design selected in this paper is reasonable,the choice of parameters and the establishment of the model are correct.It has strong practical significance in supporting design of deep foundation pit and provides reference for engineering design and construction.