Study And Application Of Groundsill Pit Support In Soil Nail Wall

The paper discussed the role of soil nailing mechanism, performance and design calculation. For the problems of the soil nailing design that exist in theory, we present a solution to these problems. Soil nailing on the application of a wide range of soil excavation as a temporary support for high-rise buildings, underground structures, such as deep excavation, slope excavation, and so on; as a permanent retaining structure, the general and construction excavation of the temporary support the integration of the tunnel portal such as the retaining wall on top of the hole and two side retaining wall, cutting the embankment slope retaining wall, retaining wall abutment, etc., and the repair of the existing retaining wall and the reinforcement, and class of temporary support instability in the rescue reinforcement. Among the many methods of excavation support, soil nailing its methods of simple, convenient construction, rapid timely, safe and economic characteristics, such as by the majority of engineering and technical personnel favor, in engineering practice has created tremendous social and economic benefits.As the present "order" is the design theory can not be true to the discovery of the size of nailing nails stress, especially the variation of nails stress can not be calculated with the changes of groundsill pit. This paper for further study, we discussed the soil nail wall supporting basic property, principle and the work performance of the soil nail wall, analyzed the problems of the current soil nail wall supporting calculation method. We discussed the calculation methods in the calculation of soil nails at the deficiencies and shortcomings, proposed construction process based on dynamic calculation of the soil nails. According to this paper, the construction process based on dynamic calculation of the soil nails designed the "Harbin mobile communication project" groundsill pit support of soil nailing.Harbin mobile communications hub to groundsill pit support works as an example, based on the groundsill pit dynamic calculation methods, we design the project excavation of soil nailing structure. The soil nailing force, rational design, length and spacing are analyzed accurately. Through the proper design of soil nails and surface connections to form a soil nails and soil interaction mechanism for the support system to ensure that the excavation safety, reducing the project cost.