A Calculation Method of Horizontal Anti-lateral Stiffness of Cylinder-type Foundation Pit Supporting Pile Top-Crown Beam

Abstract

The invention provides a method for computing horizontal lateral stiffness of a pile top crown beam of a support pile of a cylindrical foundation pit. Through simplifying a cylindrical support system into an axial symmetry stress problem, establishing a computational formula of the horizontal lateral stiffness of the pile top crown beam of the support pile of the cylindrical foundation pit and computing to obtain the horizontal lateral stiffness of the pile top crown beam, the conventional elastic resistance method can be adopted to analyze and design a support structure of the cylindrical foundation pit, the deformation state and the stress state of the support pile can be more really reflected, the spatial effect of the cylindrical foundation pit is fully utilized, the tangible support of the cylindrical foundation pit is reduced and even avoided, the earth excavation of the foundation pit is facilitated, the engineering construction period and cost are saved, the energy consumption is reduced, and the method has larger economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit support engineering, in particular to a method for calculating the horizontal lateral stiffness of a cylindrical foundation pit support pile crown beam. Background technique [0002] With the acceleration of the urbanization process and the shortage of urban land, the development trend of high-rise buildings is that the number of floors increases, the height increases, the number of underground floors increases, the foundation depth deepens, and the connection with surrounding buildings is closer. Design and construction technology are also developing rapidly. [0003] Due to its obvious spatial effect, the cylindrical pile row support is more and more widely used in deep foundation pit projects in urban areas with dense surrounding buildings where the excavation area is not too large and the excavation depth is relatively deep. [0004] In order to coordinate the deformation of each ...

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Problems solved by technology

[0006] Aiming at the current situation that many cylindrical foundation pits are provided with a large number of physical supports and cause serious waste of social resources, the present invention provides a method for calculating the horizontal lateral stiffness of the top, crown, and beam of cylindrical foundation pit support piles. The support system is simplified as an axisymmetric stress problem, and the calculation formula for the horizontal lateral stiffness of the top crown beam of the cylindrical foundation pit support pile is established. After calculating the lateral stiffness of the pile top crown beam, the traditional elastic resistance can be used The analysis and design of the cylindrical foundation pit support structure can more truly reflect the deformation and stress state of the support piles

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