The Design And Numerical Simulation Studies On Cross Anchor Structure In Foundation Pit Bracing

With the rapid development of urban, underground space utilization is geting more and more.Foundation pit is deeper and deeper, at the same time the density of foundation pit site is more intensive.Deep excavation bracing often used slender rods as anchor cable and soil nails.Adjacent constructing foundation pits usually influence mutually by the underground bars.The lengthe of anchor cable and soil nails is a keystone of design,but the adjacent constructing foundation pits strictly limit the length of cable and nails.At present the study of adjacent foundation pits and interactional underground bars is uncommon,and the engineering design examples are very infrequent.In this thesis the author taken two adjacent foundation pits as an example, and used the analytical calculation and FLAC-2D numerical simulation softwears as tools,and makes a preliminary study of mechanics characteristic of factors in adjacent foundation pits.In this project, the engineers designed and used the anchor cable and soil nails of two adjacent foundation pits combined together,and in this thesis the author named this foundation pit bracing construction technology as cross anchor structure.The thesis point did a analytical calculation to the soil nailing wall and anchored soldier piles in this project,and used the FLAC-2D programme to make a numerical simulation to the model of cross anchor structure,and contrast observation data nonlinear regression analysis result and the simulation result.