Servo steel supporting system axial force determining method taking maximum displacement as control target

Abstract

The invention provides a servo steel supporting system axial force determining method taking maximum displacement as a control target. The method specifically includes following steps: (1), accordingto actual engineering, building an elastic foundation beam model, and determining related calculation parameters and maximum displacement control requirements; (2), establishing a control balance equation of a servo system elastic foundation beam; (3), determining a regulating support, and correcting a corresponding supporting rigidity matrix; (4), increasing regulating axial force value step by step, and solving a stress balance equation to acquire a corresponding wall displacement value; (5), calculating wall bending moment shear force and each supporting axial force value, and judging whether stress of each component meets a design value or not. On the basis of a servo system control balance equation, each boundary condition under control of axial force is judged through iterative calculation, a servo supporting control axial force determining method is provided, and a theoretical reference can be provided for design construction.

Description

technical field [0001] The invention relates to the field of force deformation calculation of servo steel support regulation in foundation pit engineering, and mainly relates to a method for determining the axial force of a servo steel support system with maximum displacement as the control target. Background technique [0002] With the rapid development of urban underground space, the requirements for the surrounding environment protection of foundation pit excavation are constantly increasing. Compared with the characteristics of passive force bearing of traditional supports, servo steel supports adopt the control method of actively applying axial force, which is more and more widely used in projects that require high deformation control of foundation pits. However, because the servo system has been popularized and used for a short period of time, the theoretical research on its control methods is insufficient, and the control methods adopted by the construction unit are r...

AI Technical Summary

Problems solved by technology

First, on-site real-time monitoring of deformation is the basis for regulation and lack of engineering prediction ability, so it is impossible to predict the development of wall deformation

Second, there are differences between the design of the servo system and the actual construction on site. This regulation can serve the actual construction, but it cannot provide a theoretical basis for the servo design

Third, the focus of the measurement and control method is single, and only the displacement is used as the target, ignoring the fact that the bending moment and shear force of the wall may exceed the design value when the servo support axial force is adjusted.

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