A cantilever type supporting structure design method based on deformation control

Abstract

The invention provides a cantilever type supporting structure design method based on deformation control. The cantilever type supporting structure design method comprises the steps of S1 determining the section parameters of a foundation pit and physical and mechanical parameters of a soil body; S2 determining a displacement mode of the support structure, and determining a model sketch; S3 calculating the active soil pressure and the driven soil pressure of the foundation pit supporting structure respectively, and determining the anti-overturning critical embedding depth of the supporting structure according to the moment balance principle; S4 calculating the maximum bending moment and the maximum shearing force of the supporting structure respectively, and determining the materials and reinforcing bars of the supporting structure according to the maximum bending moment and the maximum shearing force respectively; and S5 carrying out overall stability checking calculation and uplift resistance stability checking calculation. The method overcomes the defect that deformation of the supporting structure cannot be considered in a conventional foundation pit design method, the design calculation is controlled through the deformation degree of the cantilever type supporting structure, the calculation method is simple and feasible, the construction cost can be effectively saved and the construction amount can be effectively reduced on the premise that safety is ensured, and the method has good application and popularization value.

Description

technical field [0001] The invention relates to the technical field of civil engineering construction, in particular to a design method of a cantilever support structure based on deformation control. Background technique [0002] With the further advancement of our country's capital construction projects, the theoretical level of foundation pit engineering design has also been greatly developed, and the traditional method of design according to bearing capacity is gradually transitioning to design according to deformation control. [0003] However, the existing support structure design methods are mostly based on the limit equilibrium method. This method calculates the internal force of the support structure under the assumption that the soil before and after the pile reaches the limit earth pressure state, and cannot consider the deformation of the support structure. However, in actual foundation pit engineering, the deformation limit of the support structure is usually rel...

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Problems solved by technology

[0003] However, the existing support structure design methods are mostly based on the limit equilibrium method. This method calculates the internal force of the support structure under the assumption that the soil before and after the pile reaches the limit earth pressure state, and cannot consider the impact of the deformation of the support structure on the pile. However, in the actual foundation pit engineering, the deformation limit of the support structure is usually relatively strict, and the soil before and after the pile often cannot fully reach the limit earth pressure state

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