Simulation on the Supporting of Underground Storage Foundation Pit by Anchor and Soil Nail

At present, the composite supporting technology of prestressed anchor and soil nailing has been more and more widely used in the foundation pit engineering, but the related existing theory and method can not satisfy the engineering practice, so it is necessary to do the discussion of this technology.In this paper, the foundation pit of underground storage in Zheng Zhou City was chose as an example, the simulation model for composite supporting of anchor and soil nail was set by FLAC software, the ideal elastic-plastic constitutive model was selected for soil, the cable unit was selected for the prestressed anchor and soil nailing, based on the interaction between supporting system and soil, the dynamic process for the excavation and support of foundation pit was simulated.The law for the effect of the excavation on disturbance, soil changes in displacement and internal force distribution of soil nail and anchor was obtained in this study, the connection line of the maximum axial force of soil nail and anchor were actually the potential failure surface of soil foundation pit, the position change of maximum axial force reflected the trends of internal displacement of excavated soil.The related conclusions have certain reference significance for the composite anchor and soil nailing supporting design.