| As a new retaining structure, composite soil nailed wall has been widely applied in the foundation pit Now, research on the work performance of the soil nailed wall during the construction can not reveal on-site work, this occurs especially in Xi'an area with rich groundwater where groundwater is forbidden to be lowered. Based on analysis of the domestic and foreign data, using the finite element method, this paper probe into the bearing capacity and deformation of the composite soil nailed wall. Then some results are gotten, as follows:The composition and construction of the composite soil nailed wall are analyzed, and the engineering characteristics of the typical construction wall are valued.The destruction forms of the composite soil nailed wall are summed up. The methods are put forward to check the anti-seepage stability, anti-heave stability and overall stability of the composite soil nailed wall, in which the mistakes of shearing force balance method now used in anti-heave stability is pointed out and corrected. Factors influencing on the bearing capacity and deformation of composite soil nailed wall are discussed. Some conclusions are helpful to the design and construction of composite soil nailed wall in Xi'an area.Based on analysis of the characteristics of the composite soil nailed wall, simulating the soil nail, concrete layer, deep mixing pile and step excavation, a model is established to calculate the deformation of the wall, compiled simple and applied program of one dimension FEM; According to the field test data and the calculated data by the FEM software this paper has developed, the design method and deformation of the wall in Xi'an area is discussed. The shape of destructive sliding surface of the wall in loess strata in Xi'an area with deep groundwater is gotten. Finally the lateral deformation distribution and the experiential formula to predict maximal horizontal displacement of the composite soil nailed wall are given.
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