Research On Working Mechanism Of Supporting Structure Of Jointed Anchored Wall With Pile-supported Cantilever Retaining Wall

With the rapid development of roads,railways and urban construction,retaining structures are widely used in highway,water conservancy,mining,housing construction and other projects.Under the complex construction site conditions,the general retaining structure can not meet the construction requirements either from a technical or an economic perspective.As a new type of composite retaining structure,the high light support structure has been widely used in deep foundation pit support engineering and landslide treatment project because of its strong mechanical and economic advantages.Because there is no clear regulation on this new type of retaining structure in our current various specifications,there is no mature,systematic theoretical support and no complete numerical simulation program.This paper relies on the selection of support schemes for high fill slopes in Zhuzhou comprehensive demonstration base in Hunan province.The pile supported cantilever retaining wall combined anchor wall supporting structure is put forward.The working mechanism and influence factors of the supporting structure of the anchored wall with cantilever retaining wall are studied by the method of theoretical analysis and numerical simulation,and the main achievements are obtained as follows:1.On the basis of summarizing and sorting out the theory of active earth pressure calculation,the distribution law of soil pressure on the joint anchored wall supporting structure of cantilever retaining wall is discussed,and the mechanical model of internal force and deformation of supporting structure is established.2.Based on the displacement method and the "m" method in structural mechanics,the analysis method of internal force and deformation of the cantilever retaining wall combined with anchored wall support structure is proposed,and the approximate analytical formula for calculation of internal force and deformation is derived.The law of internal force and deformation analysis of support structure is obtained.3.A finite difference model for the interaction between pile supported cantilever retaining wall and anchored wall is established.The numerical simulation results verify the reliability of the theoretical analysis method.Thefactors affecting the internal force,deformation and stability of the supporting structure are studied.Reasonable arrangement of piles and setting of tie bars are obtained.