Optimal Design Of Supporting Structure For A Deep Foundation Pit In Handan

Foundation pit support engineering is a geotechnical engineering problem which is restricted and related by many factors.The stability,reliability and high economy of foundation pit are affected by the selected support scheme and design parameters.In order to reduce the occurrence of accidents and improve the construction quality of the project,a safe and reliable,economical and reasonable foundation pit support scheme must be designed.Therefore,on the basis of safety,how to minimize the support cost,minimize the construction period and maximize the construction convenience is the main purpose of this paper.First of all,this paper takes the deep foundation pit support project of Guorui Residential District in Handan City,Hebei Province as the research object,according to the general situation of the project,geological information,hydrological conditions and so on,based on the theory of matter-element analysis,the best supporting form is selected.On the premise of satisfying the safety factor,the changes of pile length,pile diameter,pile spacing,anchor cable position and other factors are explored.By studying the changes of horizontal displacement,structural internal force and surface settlement of the foundation pit,the influence of these four factors on the whole foundation pit engineering is obtained,and the optimal parameter design is obtained.Finally,through the ABAQUS.The optimal design parameters are modeled and analyzed by finite element software,and it is proved that the optimization scheme can be applied in practical engineering.The research results of this paper mainly include:Based on the development of foundation pit support at home and abroad for many years,some foundation pit support types which are widely used in foundation pit support engineering are summarized,and the characteristics,advantages and disadvantages of these supporting types are obtained,and the specific applicable scope of these supporting structures is summarized.According to the actual project of Handan City,on the basis of the design theory of deep foundation pit and matter-element analysis,for the purpose of safety,reliability,economy and reasonableness,protection of the environment and construction period,the comprehensive evaluation is carried out,and the optimalfoundation pit support scheme is selected by comparison and optimization.On the premise of calculating and analyzing the detail parameters of the selected foundation pit support scheme,the parameters are optimized under the premise of meeting the requirements of the code and the safety and stability coefficient.The ABAQUS finite element software is used to model and analyze the final optimization scheme,and it is verified that the scheme can be applied in practical engineering.