Analysis On The Accident Of Floating Cracking And Research On Reinforcement Technology Of A Basement Structural Engineering

With the acceleration of the urbanization process in China,the scale of each large and medium-sized city is in the stage of rapid expansion,so on the one hand,the urban land needs to be continuously expanded,on the other hand,the vertical space development of the city has become a very impor tant field,which is reflected in the rapid growth of building height and the development speed of underground space,such as the rapid growth of underground garage and underground shopping mall But because of the concealment of underground space,there are many problems in underground structure.The anti-floating design of building is one of the most important fields.For rainy areas in the south,coastal areas in the East and areas seriously affected by groundwater,there are many cases of damage caused b y building floating.But at present,there are many problems in the research and specification of anti-floating design at home and abroad,so it is of great significance to the research on the mechanism of uplift,survey and design,and anti-floating measures of underground structures.In this paper,the mechanism of basement structure floating,anti-floating design and reinforcement measures are studied as follows:(1)This paper compares and analyzes the provisions of different codes at home and abroad on groundwater investigation,determination of anti-floating fortification water level,and puts forward the shortcomings of current codes.Based on literature review and engineering data,this paper summarizes the research and application status of basement floating mechanism and anti-floating anchor.(2)The influence of the existing state and seepage mechanism of groundwater on the calculation and reduction of buoyancy is put forward.Combined with the mechanism and mode of basement structure floating fail ure,the stress conditions of basement structure in normal use and floating failure are simulated by Midas Gen finite element analysis software.The influence of basement floating accident on the stress of upper components is studied.The qualitative and quantitative stress analysis is carried out for the relevant nodes and components with typical failure.(3)With the aid of ABAQUS finite element analysis software,the numerical analysis of bolt is carried out,and the stress mechanism of single bolt is st udied.In this paper,the orthogonal design method is used to analyze the parameters of the group anchor effect of the bolt,and the influence of the bolt spacing,bolt length and other factors on the group anchor effect is studied.(4)Based on the failure accident of a basement structure floating up in Lujiang County,Hefei City,this paper comprehensively analyzes the reasons that may cause the basement floating up from the aspects of design and construction,obtains the optimal reinforcement treatment p lan,gives the reinforcement design method of the basement structure anti floating reinforcement project,and proves the correctness and feasibility o f the technical program of anti-floating reinforcement The treatment of accidents has a good reference significance.