Spatial Layout Design And Construction Safety Evaluation Of Guanggu Square Underground Complex In Wuhan City

At present,the construction of underground complex in China is developing rapidly,which greatly lessens the tension of the problem of land shortage in the center of dense metropolises in China.However,the rational spatial layout design and scientific evaluation of construction safety to such large and complex underground space is one of the key issues to be solved urgently in the development and utilization of large urban underground spaces,and it is to be studied systematically.This paper focuses on the largest project of underground urban complex in China,the Guanggu Square Underground Complex,carries out study on its spatial layout and construction safety evaluation and analysis,and the related research can provide reference for the future construction of similar large underground complex projects in China.The main contents for study of this paper are listed as follows:(1)Combined with a statistical analysis of spatial layout models for lots of underground complexes at home and abroad,this paper clarifies the space layout model and characteristics of large underground complex;then,combined with the development status and realistic needs around Guanggu Square,it probes into the covered formats and development ideas of the Guanggu Square Underground Complex;finally,it analyzes the spatial layout pattern of the business state covered by the complex,and comprehensively carries out the design and comparison of the layout scheme,and then puts forward the optimal scheme of the spatial layout of the Guanggu Square Underground Complex.(2)Tease out the spatial layout characteristics an,d their influence conditions of the Guanggu Square Underground Complex,carry out the analysis about spatial layout factors upon construction safety of underground complexs,the layered open-cut construction plan is determined after comparison;combined with the local geology condition of Wuhan city,probe into the advantages and disadvantages of common enclosing structures for deep foundation pit constructed using open-cut method;clarify the enclosing structure scheme of bored pile in the Guanggu Square Underground Complex,use the elastic resistance finite element method to calculate the envelope structure systematically,determine the design parameters of the retaining pile,put forward the support scheme for pile and internal support(3)Using Midas GTS numerical simulation software,this paper analyzes the construction safety of the Guanggu Square Underground Complex;studies the change law of the displacement of surrounding soils,the horizontal displacement of retaining pile,the axial force and the influence of the selection of pile parameters on stability;finds that the supporting scheme of interior support and retaining pile has remarkable effect on deformation control of foundation pit(4)According to the monitoring data,study the change law of horizontal displacement of retaining pile,support axial force and surface subsidence;combined with the numerical analysis of construction safety of Guanggu Square Underground Complex,this paper evaluates the rationality of construction scheme and support scheme,verifies the reliability of simulation results;and the evaluation method of safety grade extension of foundation pit is used to evaluate this engineering,thus find that the overall safety state of the support scheme proposed in this paper performs well,which can realize the safe and efficient construction of the project.