Field Testing And Numerical Analysis On Tensile Type Anti-float Anchor

With the continuous development of urban construction, the underground space technology applications, the anti-float issues of underground buildings and structures become more prominent, especially in coastal cities it is particularly evident. So to solve the issue of anti-float is urgent matter. The project reinforcement measures used by the main ballast reinforcement, anti-floating pile, anti-float anchor, The anti-float anchor is provided with the good adaptability of strata, convenience of construction, and its layout of anchors is flexible and efficient. And advantage of stress and deformation coordination of the underground structure can reduce the structure-construction cost. So it takes priority over many other reinforcement measures.Tensile type anchor at this stage is commonly used in geotechnical engineering in the form of bolt, it passed with cohesive force which is between steel stranded wire and anchor section mortar body to transfer load. To compare with pressure-type, the tensile- dispersive, the pressure-dispersive, and tension and compression, because its design method and the construction technique are relatively mature, tensile type anchor at this stage is still the main form of the use of bolts.This paper briefly reviews the various development status and the application modern state of anti-float anchor around the world,and introduces the loading and deformation behavior of the anti-float, introduces the force and deformation and damage of the anti-float anchor on the state. Based on field testing and numerical analysis, the internal force and deformation of the tensile anti-float anchor at a basement is studied. The results show that: The axle strength transmission of tensile type anchor transmits from top to bottom, the axle strength reduces gradually. On the axis of the small, and stress concentration in the head. External forces to impose a certain load when the head first to damage. With the depth of the shaft deepening substantially reduced which shows that by forcing a bolt effective length, not the longer the anchor of the anti-Stubbs Large; Effects of anchor groups is a problem can not be ignored, because of its concern about the current insufficient level of the engineering sector, making the design of anti-float anchor the lack of reliable data, this experiment's achievement may provide the reference for design in future; Prestress loss presents certain rule after stretch locking of the pre-stressed anti-float anchor.Through field testing of tensile anti-float anchor, we revealed features of this type of anti-float anchor, on the one hand test results provide basis and reference for the research work of the next tensile anti-float anchor and, on the other hand it can provide a number of important suggestions and information for the further application of anti-float anchor in the works.