| The foundation pit project has a history of 40 years in China.With the prosperity and strength of the country,more and more high-rise buildings have risen from the ground,and underground rail light transportation has also been vigorously developed,resulting in deep foundation pits even deep.There are more and more foundation pits,and the implementation of foundation pit engineering will affect the stability of the soil,and some will cause major safety accidents.Therefore,the smooth construction of the foundation pit and the stability of the surrounding environment will become more and more The more important it is,how to ensure safety and stability is now the main direction of research in foundation pit engineering.This article mainly uses MIDAS/GTS software for analysis and simulation.MIDAS/GTS software mainly uses finite element analysis.The finite element method not only has high calculation accuracy,but also can adapt to various complex shapes,so it has become an effective engineering analysis method.The excavation of the foundation pit simulated in this article is based on a shopping mall in Nanchang as an example.The MIDAS software is used to simulate the excavation of the AB section.The calculation results are analyzed and the calculation results of the rationalization software are analyzed,and the monitoring data are carried out.Comparative analysis and draw relevant conclu-sions.Use MIDAS software for step-by-step simulation analysis optimize some parameters of double-row piles.The main conclusions of this study are as follows:(1)By comparison,it is found that the results obtained by MIDAS are more consistent with the actual situation,and the difference between the amount of deformation and the monitored value is smaller.The reason for these differences is that MIDAS defines the material properties in more detail,and rationalizes the software’s assumptions The fewer conditions indicate that the MIDAS/GTS software’s support simulation of double-row piles is more realistic than the rationalization software and can be better applied to foundation pit support design to guide engineering practice.(2)The parameters of pile length,pile diameter and pile spacing of the double-row piles were optimized,and the optimization simulation of the supporting structure using Midas software can be concluded:(1)The longer the pile length,the supporting structure The less deformation,but if the pile length is too long,the overall safety does not change much,resulting in wasteful construction costs.(2)While keeping the length of the front row pile unchanged,change the length of the back row pile and found that with the The increase of the rear row piles increases the overall safety and stability of the supporting structure,but the pile length is too long,and the overall safety has not changed much.(3)The front row piles remain unchanged,and the pile spacing of the rear row piles is changed.The larger the pile spacing,the worse the safety of the supporting structure.(4)Change the size of the pile diameter of the row of piles,which can be analyzed from the simulation.The smaller the pile diameter,the worse the safety performance of the supporting structure and the greater the deformation of the supporting structure.(5)Change the stiffness of the double-row pile,the greater the stiffness,the pile The smaller the overall displacement of the body,but after the stiffness exceeds a certain amount,the actual displacement changes little,resulting in a waste of cost. |
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