The Steel Support Performance Of Deep Foundation Supporting Structure With Underground Continuous Wall

In the process of rapid economic development, There have been many problems, Such as sharp increase in the urban population, urban development is faced with shortage of land, traffic congestion and so on. To solve such problems, High-rise buildings, underground shopping malls, underground parking and other architectural forms are widely used. And the core element of these technologies is the excavation technique. This article is based on an engineering example, We ultimately make the decision using the support scheme of underground continuous wall with steel support after several common support schemes are compared.In the study of the performance of steel support, Using the numerical simulation method, We calculate the limits of stability capacity about the lateral support, corner support as well as longitudinal support, and then make a analysis of the vertical deformation and components stress to steel support under the action of its own weight. Firstly, verify the feasibility of supporting scheme respectively from three aspects which are support maximum axial force, maximum deformation of underground continuous wall and surface subsidence values; Secondly, make an analysis of steel support axial force about any layer in three layers and the change of axial force of each layer in the construction stages based on the simulation results; And then Discuss the impact to supporting structure after prestressing steel support, Using0.5to0.8times of the design axial force as the values of prestressing steel support, make the Analysis of simulation results from the deformation of underground continuous wall and surface subsidence and then draw some relevant conclusions.The article also describes that the steel support excavation program is further optimized, Namely remove the longitudinal support from the horizontal arrangement, Appropriate to increase the corner support spacing, The number of layers reduced from three vertical supports to two, Appropriately reduce steel support size, Finally, based on numerical simulation, Compare the support schemes with before and after optimization, We make it true that the efficiency of steel support axial forces is improved from the current engineering practice about25%up to39.5%, and put forward to some approaches to improve efficiency of the support shaft force.