Research On Deformation Of Foundation Pit Support Of A High-rise Building In Chengdu Based On FLAC3D

With the development of modernization process,engineering construction is advancing rapidly,and land resources are also becoming extremely precious.In order to make better use of engineering land,high-rise buildings are becoming more and more popular and the building height is getting higher and higher.At the same time,various places are also starting to build subway stations,infrastructure,and underground supermarkets vigorously.As a result,there are more and more basement floors and the depth of foundation pit engineering is generally 10-20 m,some are even more than 40 m,the buried depth of the foundation is also increasing,which requires more and more strict foundation pit support scheme to ensure the stability of the foundation pit.Therefore,in the field of geotechnical engineering,the excavation and support design of deep foundation pit or even super deep foundation pit has become an important topic of engineering research.In this paper,the design of deep foundation pit support of a high-rise building in Chengdu is taken as an example.It combines with the site engineering geological data and the surrounding environment,It also makes reference to relevant codes and regulations,through the selection and comparison of various foundation pit support schemes.It is finally determined that the combined support system of bored pile +anchor + soil nail wall is the best support scheme in this field.The elastic fulcrum method is used to calculate the horizontal displacement of the retaining structure,and its reinforcement is calculated.Considering the limitation of classical mechanics theory to practical problems,the whole process of foundation pit excavation is simulated by FLAC3 D software.The horizontal displacement of the side wall of foundation pit,the vertical displacement of the bottom of foundation pit and the surrounding of foundation pit are analyzed.The analysis results are similar to those of the manual calculation by elastic fulcrum method and the auxiliary calculation by thedesign software of Lizheng deep foundation pit to verify the number The accuracy of numerical simulation can provide similar experience for similar projects in the future.