Underground Engineering Inverse Method Package Pile Stress Analysis And Optimization Design

Along with the acceleration of urbanization in our country.Many cities have different degrees of urban land tension,a lot of problems such as crowded living space.The development and utilization of underground space provides a very rich space resources for urban development, and has important social benefits.At the same time, Reverse construction technique has been widely used in civil air defense engineering, subway construction and other underground structures.In this paper, a underground civil air defense project in Guangdong province is studied.Weak quicksand regions for the underground civil air defense engineering under uni-axial package of pile bearing performance is analyzed and discussed.To provide reference for the construction of similar projects,to provide reference for the construction of similar projects.The contents of this dissertation are summarized as follows:(1) Combined with the characteristics of civil air defense project, the paper introduces the characteristics and the development situation of the top-down construction method and the inverse construction in soft soil area.(2) In this paper, the vertical support structure design and the construction of the key nodes of the reverse construction method in underground engineering are described in detail.From the angle of finite element, the calculation theory of soil excavation load and the simulation theory of the excavation process are described in detail.(3) A detailed study and Analysis on the vertical displacement, uni-axial package pile's axial force and the stress and strain of the vertical column of the underground structure are carried out in detail.(4) The uni-axial package pile, the stress and deformation characteristics of pile with different sizes and different strength are analyzed, and the idea and method of optimizing design are put forward.