Design And Numerical Simulation Analysis Of Deep Foundation Pit Supporting At Guangzhou Poly Xian Village

Deep foundation pit engineering is the inevitable result of urban development prosperity and progress.It involves many problems and requires advanced technology.Deep foundation pit engineering is also a complex and high-risk system engineering,It involves plenty of disciplines,such as engineering geology,water level geology,soil mechanics,fluid mechanics,engineering mechanics,structural mechanics,environmental science,etc.,Therefore,it has a very strong synthesis sexual and any influential factors.With the urban buildings and the transformation of the old city increasing,the excavation space is more limited,the foundation pit engineering requirements are higher.Because it needs to ensure the safety of foundation pit,so the underground works can be carried out and meanwhile to ensure the security of the surrounding buildings,pipeline,roads etc.I t is of great practical significance to study the stress,strain,deformation and stability of deep foundation pit in construction.In this paper,the design and simulation of the deep foundation pit support are carried out by using the software and FLAC3 D software,and the results are compared with the actual monitoring of the project.And the overall consistency is good,which proves the practicability of numerical simulation method in deep foundation pit engineering.When studying the horizontal displacement,vertical displacement,axial force of prestressed anchor,the bending moment of supporting pile and the plastic zone of foundation The main contents and achievements of this paper are as follows:(1)In this paper,FLAC3 D software is used to simulate the deformation characteristics and stress distribution of foundation pit excavation without support under the condition of deep foundation pit excavation in Guangzhou Poly County,and find out the weak part.By using the rational software to carry out the design of the foundation pit support design,we get the rapid optimization design and enhance the work efficiency.At the same time,exploreing the advangtage of FLAC3 D and F-SPW7.0 which based on different theories.The rationality of pile-anchor support in this deep foundation pit is verified.(2)Through FLAC3 D,we simulate the process of excavating the foundation.In the process,moniting the horizontal displacement of the foundation pit,the settlement of the foundation and the internal force of the anchor.there are some differences in the results of numerical simulation software comparing with the actual process monitoring data.The main reason is that the geotechnical parameters are large,the numerical simulation is difficult to space-time effect and it is difficult to consider the many influencing factors,but the development trend and the quantitative results are more consistent.It is availible for the design of deep foundation pit.Therefore,it could be a reference for foundation pit project in this area or similar area.(3)The stability analysis of the foundation pit slope is carried out by using the strength reduction coefficient method of FLAC3 D.Combining with the stability analysis,the anti-overturning stability analysis and the anti-uplift stability analysis of the deep foundation pit design software.The stability of the foundation pit is evaluated by various methods,and the reliability of the stability analysis is improved.