Optimization Design Of Bracing System Of A Deep Foundation Pit

In the construction projects all over the world,the foundation pit project belongs to a work with the largest amount of use,the largest amount of investment,the highest degree of difficulty,and the greatest risk.Pit is important in foundation pit engineering,it should not only ensure the soil deformation in the control range,but also to ensure the safety of foundation pit structure,on the basis of safety,to minimize cost and maximize the convenience of construction duration minimizationThis paper takes Hebei Handan Tianzhao building foundation pit engineering as the research object,according to the general situation of the project of engineering,engineering geological information,multi objective decision making based on the fuzzy theory,select the best support form,while Lizheng software carries on the thorough analysis to the pile length,pile diameter,pile spacing,anchor position four influence factors based on the four kinds of factors on the horizontal displacement of the pit,the internal force of the structure,the surface subsidence caused by the impact,the optimal design of the parameters,the final plan for modeling analysis by finite element software,proved that the scheme can be used in practical engineering.The main research results of this paper include:(1)According to the development of foundation pit support over the years,summarizes the main use of most domestic engineering excavation and the categories,several kinds of supporting structure characteristics and advantages and disadvantages,and concludes the several supporting structure of the specific scope of application.(2)According to the actual project of Hebei city of Handan,in the deep foundation pit design theory and multi-objective decision-making on the basis of fuzzy theory,which is safe and reliable,the construction cost of the economy,and small environmental impact,through the comprehensive evaluation method and AHP,a comparison between the foundation and the optimal scheme.(3)For the selected optimal scheme,through the calculation and analysis of the detailed parameters,the optimal parameter design is obtained under the premise of minimizing costs,maximizing the convenience and meeting the requirements of the specifications(4)The final optimization scheme is analyzed by finite element method,and it is proved that the scheme can be used in practical engineering.