Numerical Simulation Of Force And Deformation Of Pile Anchor In Deep Miscellaneous Fill Foundation Pit

In recent years,China's rapid economic growth,GDP and other economic indicators continue to grow steadily for many years,followed by not only the improvement of China's international status,but also the country's earth shaking changes,the people's living standards have been improved,the scale of national urbanization has become larger and larger,the city continues to expand outwards,and tall buildings have been erected,but at the same time of the rapid development of the country,for Urban construction uses less and less land,land scarcity makes people turn their attention to the development and utilization of fill area.Due to the fact that the fill is formed by artificial accumulation,there are many kinds of backfill,the nature of the soil is uneven,and the engineering property is poor.In order to ensure the safety of geotechnical engineering construction such as foundation engineering in the fill area,a large amount of money is often required.If the cost is too saved,the safety of the construction in the fill area cannot be guaranteed.Once the geotechnical engineering safety problems occur,it will be hard to bear The consequences.Moreover,the poor engineering properties of the fill lead to the unsatisfactory actual construction effect of the commonly used construction technology and methods in the fill area.Therefore,the stress and deformation of the geotechnical engineering in the fill area are analyzed,the law of the stress and deformation of the geotechnical engineering in the fill area is mastered,the construction technology suitable for the fill area is found,and the economic efficiency of the geotechnical engineering construction in the fill area is found In recent years,the balance point with safety has become a hot and difficult point in geotechnical industry.In this paper,based on the foundation pit supporting project of No.81 shanluan street reconstruction project of Laohutan street,Zhongshan District,Dalian City,combined with the field monitoring data and other data,the stress and deformation law of the miscellaneous fill foundation pit of the pile anchor support system before and after grouting reinforcement are studied.The foundation pit design of No.81 reconstruction project of shanluan Street adopts the design scheme of cast-in-place pile + prestressed anchor cable + grouting reinforcement.In this paper,the foundation pit support design before and after grouting reinforcement is calculated by using the 7.0 version of Lizheng deep foundation pit,and the excavation process before and after grouting reinforcement is simulated by Midas GTS The simulation results of GTS for the excavation process of foundation pit are close to the calculation results of straightening out the deep foundation pit software and the field monitoring data,which shows that the numerical simulation results are reliable;when the foundation pit is not reinforced by grouting,the stress law of the support structure is not consistent with the traditional pile anchor support,the displacement of the support structure is too large,the stress loss of the prestressed anchor cable anchorage section is serious,and the safety of the foundation pit is difficult to guarantee;After the foundation pit is reinforced by grouting,the displacement of the supporting structure and the safety factor of each working condition meet the requirements of the code.The loss of stress in the anchorage section of the prestressed anchor cable is obviously reduced,and the safety of the foundation pit is guaranteed.