Foundation Pit Support Scheme Selection And Deformation Simulation Analysis Based On Analytic Hierarchy Process

With the rapid development of China's economy and the expansion of the scale of urban construction,deep foundation pit project has been more and more applications.At the same time,accidents increase of the deep foundation pit engineering relative to other projects,not only increased the number of casualties,but also which caused huge economic losses and brought serious adverse effects on society.Our technicians have invested a lot of energy in deep foundation pit engineering,not only has made some progress in theory,but also these theories have been tested in practice in recent years.However,in many practical work,the theoretical calculation and the actual situation of the construction site are not fully consistent,because of the complexity of deep foundation pit engineering,at this time need to have certain engineering experience of engineering and technical personnel to make accurate judgment to the calculation result of deep foundation pit.And in view this situation,with a deep foundation pit in Nanjing city as an example in this paper,the selection of the supporting scheme and the theoretical research of deep foundation pit engineering are carried out and on the basis of using ABAQUS finite element software simulation calculation of the foundation pit.For the construction of foundation pit engineering,determine what kind of structure before excavation support scheme is an important structure of foundation pit supporting project,choose the optimal supporting scheme in the existing structure and the structure of the support scheme is an important content of the deep foundation pit design.Comprehensive the above problems,therefore,the research direction of this article mainly include the following:A deep excavation in Nanjing city as the example,the paper in Nanjing now,with the structure of deep foundation pit support scheme(underground continuous wall,pile brace,SWM pile method)by using hierarchical analysis and fuzzy evaluation method for optimizing,eventually choose relatively the best structure of deep foundation pit support scheme(pile support),as the concrete implementation plan of the deep foundation pit supporting structure.Use of optimizing the structure of deep foundation pit support scheme after pile(support)for the design of the deep foundation pit and combining principle is deep foundation pit F-SPW7.0 for calculation,the structure of deep foundation pit support scheme to the design results with finite element software ABAQUS simulation further comparison and analysis,the results of the results showed that using the ABAQUS finite element software simulation can effectively make up the lack of design,can directly reflect in the process of the deep foundation pit excavation more regularity of stress and strain of soil.Finally in the finite element software ABAQUS to pile under different depth of the built-in capacity(for deep foundation pit soil)horizontal displacement and the settlement of deep foundation pit lateral surface soil and the influence of the bottom of the deep foundation pit uplift,choose the best built-in depth of pile,provides the valuable reference value for practical engineering,better service the actual project.To sum up,the use of optimization of structure of deep foundation pit support scheme can be more reasonable structure of the deep foundation pit supporting design and the finite element software ABAQUS simulation can make all aspects of the design result is more optimized,as a result,this paper has corresponding reference value to the practical engineering.