Optimum Design Of Anti-Floating Anchor Rod Of Underground Structure Based On ANSYS

With the continuous development of urban construction,land has become a key factor restricting the development of urban economy.So accordingly,the development and utilization of underground space has become a trend.Over the past decades,owing to the widespread exploitation of the underground space,underground construction has been quite common,in which underground anti-floating design if of great significance in the design of the building structure.The commonly used anti-floating methods in engineering are:counter-weight method,descending-drainage method,pile anti-floating method,anchor anti-floating method.Among which,the bolt anti-floating method has been widely applied in anti-floating engineering and slope support and engineering reinforcement at home and abroad because of the advantages of its bottom structure like the homogeneous and reasonable stress,the convenience of construction,short construction time,low cost and so on.Domestic and foreign scholars have done a lot of experiments and theoretical research on the transfer mechanism of anchor load.However,due to the complexity of the load transfer of the anchor,there is no mature theoretical basis.At present,there is still a question that it is difficult to describe the transfer mechanism of the anchor-soil adhesive interface in different engineering by using mechanics and mathematical models.In this thesis,the calculation formula of the friction resistance distribution of the anchor is deduced by applying a segmental mechanic analysis for the anchor.And a quite systematic research for anchor anti-floating is launched,combined with a practical example of a certain project,and using the methods of theoretical calculation,field measurement and finite element analysis.The main contents include:(1)the analysis of the mechanism of anti-floating anchor stress.As for the complexity of the deduction process,and the application of mplicit function for the results in the existing theoretical researches,double series expression of the anchor side friction resistance distribution is obtained in this thesis through the segmental analysis of anchor and the analysis and solution by material and mechanic knowledge.(2)the compared verification of the the rational calculation of single anchor and the rationality of software simulation combined with the field test data of anti-floating anchor.And the rational calculation and finite element simulation of the anti-floating anchor of a building basement are carried out by reasonable value for the parameters.The rationality of both of the latter two conditions is verified by the field data of pull-out test.(3)The anti-floating internal force analysis of the basement of the baseboard is carried out.According to the analysis results,the anti-floating design scheme is optimized,and the corresponding anti-floating anchors are arranged rationally in the concentrated area of the internal stress,and further analysis is carried out to obtain the homogeneous and reasonable baseboard stress figure,which shows the the rationality of the optimized design.