Design method of angle brace supporting structure for foundation pit with lateral pressures of adjacent boundaries being imbalanced

Abstract

The invention discloses a design method of an angle brace supporting structure for a foundation pit with lateral pressures of adjacent boundaries being imbalanced. The design method comprises the steps that the parameters of a foundation pit design model are determined; the arrangement form of an inner support is determined; the overall pressures of side walls, on the adjacent boundaries, of the foundation pit within the action range of an angle brace (3) are determined; the parameters of an enclosing structure on the side with the low side wall overall pressure and the internal force of the angle brace are determined according to a single-fulcrum pile static balance method; the parameters of an enclosing structure on the side with the high side wall overall pressure are determined according to the single-fulcrum pile static balance method; the materials of the enclosing structures and reinforcing bars are determined according to the maximum bending moment and the maximum shearing force of the enclosing structures of all the portions; and finally, overall stability checking calculation, capsizing resistance checking calculation and heave-resistant stability checking calculation are conducted. By the adoption of the design method of the angle brace supporting structure for the foundation pit with the lateral pressures of the adjacent boundaries being imbalanced, the adjustment capacity of the enclosing structures is fully utilized for making the pressures of the two ends of the angle brace equal, the purpose of safe, economical and effective supporting is achieved, and the design method has extremely high popularization and application value.

Description

technical field [0001] The invention relates to a method for designing a foundation pit angle bracing support structure with unbalanced pressure on adjacent boundary sides, and belongs to the technical field of civil engineering construction. Background technique [0002] With the maturity of foundation pit support technology, the internal support is more and more widely used in various large foundation pits due to its advantages of high rigidity, strong deformation control ability, and no invasion of the underground space around the foundation pit. The current internal support mainly includes the form of orthogonal support, the support form of paired angle bracing combined with side truss, and the form of circular support. [0003] At present, for the design of the internal support structure, under normal circumstances, the lateral horizontal pressure such as overloading and horizontal earth pressure on the outside of the foundation pit is passed through the enclosure struc...

AI Technical Summary

Problems solved by technology

However, in engineering practice, many deep and large foundation pits are usually located in complex cities, surrounded by various tall buildings, and the piled and moving loads on the side of the pit make the distribution of lateral pressure on each boundary of the foundation pit uneven. unbalanced

This causes potential safety hazards in the large-scale foundation pit support mainly based on internal support. For the form of internal support mainly based on corner braces, if the lateral pressure difference between adjacent boundaries is large, not only the advantages of internal support cannot be exerted, but even the support will be caused. protection failure

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