Application In Enginering Of Support Technology For Deep Footing Groove

Deep footing groove project becomes more and more with middle-high-rise and ultrahigh layer buildings emerging in large quantities. At the same time, the denseness of buildings and the environmental underground facility of footing groove is complex. All these cause the question of the deep footing groove supporting of buildings to be increasingly important. According to the above, the principle of the deep footing groove supporting, the classification and suitable conditions of the supporting structure and the technical process of the excavation and supporting of the deep footing groove are elaborated systematically in this paper. Especially its destroy form and stability calculation, the calculation of the earth deform around deep footing groove, the design of supporting structure is discussed in this paper.Many buildings are laid in deeper underground where deep footing groove is needed. But in many cases, there is no sufficient space for side-sloping outside the footing groove or side-sloping can not be carried out if other buildings, underground pipeline or transport roads exist in this space. Therefore, the design and construction of vertical excavation under the protection of supporting structures, namely, supporting technique for deep footing groove, is the only way to be used. The construction of underground cellars of high-layer and multilayer buildings, underground shopping mall, underground garage and subway station will be confronted with the problem of deep footing groove. The problem of this kind will be settled by supporting technique for deep footing groove. It is necessary to understand the characters of the supporting structures of various types and to choose the suitable scheme for footing groove support based on its geological conditions and local conditions. The inner forces and deformation of supporting structures can be calculated by classical mechanical method, analytical or numerical method, FEM or a simplified method, so as to determine the size or dimensions of supporting structures.By certain construction method, footing groove excavation and the constructions of permanent structures will be completed under the protection of the supporting structures.Finally, taking the deep footing groove of HEU No.21B teaching building project and HeiLongJing mobile communication hinge building as project example, the research proposes the adopted scheme of deep footing groove supporting project, checking the design of supporting structure. The result indicates the project quality achieves the requirement.