Numerical Analysis On Horizontal Bearing Capacity And Deformation Mechanism Of Foundation Combined Pile And Diaphragm Wall

A research is made on a new type of foundation forms--diaphragm wall-piles combined foundation to provide a theoretical basis for the development of diaphragm wall and group piles foundation.The force characteristics of the new combined foundation conform to the new design concept of variable stiffness that at the position of large deformation stiffness increases and deformation decreases,and at the position of small deformation the stiffness reduces.In addition,under the action of horizontal loading,compared with undergroup continuous wall,the diaphragm wall-piles combined foundation can reduce the height and size of underground continuous wall foundation;Compared with horizontal load pile foundation,the diaphragm wall-piles combined foundation can reduce the number of piles,also conforms to the safe and economic green design concept.Carrying out a research of the theoretical research on horizontal bearing capacity and deformation mechanism of diaphragm wall-piles combined foundation,can from the mechanism makes us more in-depth understanding of the diaphragm wall-piles combined foundation deformation control,more intuitive,concrete analysis of the law of the horizontal bearing capacity and deformation,thus further to guide practice and promote this technology in the process of our country construction provides the basis of the theory and practice,this will be the research purpose and meaning.Therefore,this thesis the finite difference software FLAC-3D,establish model of the underground continuous wall-pile composite foundation,the underground continuous wallpile composite foundation in the horizontal load and stack effect of two kinds of cases through analyzing the internal force and deformation law,reveal the mechanical deformation mechanism.On the basis of the analysis of the underground continuous wall-pile composite foundation and new group pile foundation as well as the underground continuous wall and the internal force and deformation law.The main work and content is shown below:(1)Respectively introduces the horizontal load pile and domestic and foreign research present situation of underground continuous wall,simple composite foundation is expounded the present research situation,puts forward the new type of composite foundation of the underground continuous wall-pile composite foundation research purpose and meaning.(2)By analyzing the results of diaphragm walls-piles composite foundation under the effect of Lateral loading to discuss the basis of forces at different levels,different length ratio,with or without vertical forces,modulus of elasticity,friction angle,cohesion,etc.deformational and stress variation under the influence of factors.(3)By the finite difference software FLAC-3D underground continuous wall under the action of the stack and the pile composite foundation is simulated analysis,discuss the heap load level,pile wall length ratio,presence of vertical load,pile diameter,pile load area,stack distance 6 kinds of influence factors on the composite foundation under the condition of horizontal displacement and internal force are studied(4)Compared with the different parts of diaphragm wall-pile composite foundation,diaphragm wall foundation and piles foundation.