Study The Model Test And The Design Method Of Miniature Steel Pipe Piles Composite Soil Nailing Wall

With the development of the Chinese mainland high-rise buildings and taking full advantage of underground space, the original single soil nail wall technology can not meet the requirements, the single soil nail need to be used in combination with its other complement soil reinforcement the method. This case produce composite soil nail wall.Miniature steel pipe piles composite soil nail wall is a complex type of soil nail wall and micro piles. Its theoretical research is still lacking, and the mechanism of action between micro steel pipe piles and soil nailing are still in the research stage.Describes the production, development of soil nail wall,and research reality and problems of miniature steel pipe piles composite soil nail wall in this stage,summarizes the research method of composite soil nailing wall.Produced a model test equipment of miniature steel pipe piles composite soil nail wall, conducted a series of model tests by simulating the construction site in Pit.Produced a set program of test data collection, collect soil nailing strain, slope displacement, steel pipe piles strain data of model test, and analyses the conversion of data.According to the characteristics of the supporting system to establish the three-dimensional finite element model of the miniature steel pipe piles composite soil nail wall, which is analyzed by using the finite element program Midas GTS. Control of a single factor such as soil, whether set up steel pipe pile, etc., analyze the calculation results of the slope displacement, soil nail axial force, steel pipe pile bending moment etc. Then got some important conclusion.The indoor model test results and finite element analysis results were compared, In thiscase that traditional software can not design micro-pipe pile composite soil nail wall rightly, the test proved that the finite element analysis software can be used to pit design and that is an effective method.