Design method for foundation pit retaining structure

Abstract

The invention provides a design method for a foundation pit retaining structure. The design method comprises the following steps: building a calculation model of the foundation pit retaining structure; calculating the axial force of an inner support of the foundation pit retaining structure; calculating the horizontal displacement distribution values of an earth-retaining member and the maximum horizontal displacement distribution value; judging whether the maximum horizontal displacement distribution value meets the engineering requirement or not; and applying deformation to the inner support to control horizontal displacement of the earth-retaining member. According to the design method, the structure of the inner support is designed under consideration of temperature effects and horizontal displacement limit values of support points, so that the rigidity and the strength of the inner support can be fully utilized, the earth-retaining structure is optimized, displacement of the earth-retaining structure is effectively controlled, and the construction risk of the foundation pit is reduced. The design method has the advantages of simplicity, practicability, economy and the like, can be used for risk prevention and emergency disposal and has favorable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of foundation pit engineering. Background technique [0002] With the acceleration of urban construction, the construction of urban underground engineering is in the ascendant, and the excavation of deep and large foundation pits continues to emerge. In foundation pit engineering, the retaining structure often adopts ground connection wall + internal support structure. The "Technical Regulations for Building Foundation Pit Support" (JGJ120-2012) stipulates that when calculating the horizontal load acting on the retaining structure, "the effects of frost heaving and temperature changes" should be considered, and the relevant calculation formulas do not Consider the influence of temperature changes; in the structural analysis, "the internal support structure can be analyzed as a plane structure, and the load transmitted from the retaining structure to the internal support should be the fulcrum force obtained d...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for designing the retaining structure of the foundation pit, which considers the environmental temperature on the support deformation and force and the deformation limit of the support point, and solves the deficiencies in the design calculation and control method of the retaining structure of the foundation pit , to control the deformation of the surrounding environmental engineering of the foundation pit

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