Method for calculating stress deformation of servo supporting system adopting modified stiffness matrix
A technology of stiffness matrix and force deformation, which is applied in the field of simulation calculation of force deformation in foundation pit engineering, can solve the problems that the relationship between the deformation of the wall cannot be truly predicted and the lack of theoretical support.
Active Publication Date: 2018-07-06
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
However, in this method, the finite element only provides the control threshold and cannot truly predict the relationship between the axial force change of the servo steel support and the deformation of the wall in actual construction.
As Shanghai Tunnel Engineering Co., Ltd. emphasized in "Support Axial Force Servo System and Measurement and Control Method with Displacement as Servo Target" (CN107142947A) in 2017, actual construction still relies on real-time monitoring of support axial force or wall displacement and other means to control , lack of corresponding theoretical support
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[0034] The specific embodiments of the present invention are given below in conjunction with the drawings, but the present invention is not limited to the following embodiments. According to the following description and claims, the advantages and features of the present invention will be clearer. It should be noted that the drawings all adopt a very simplified form and all use imprecise ratios, which are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention.
[0035] Please refer to figure 1 with figure 2 , figure 1 Shown is a schematic diagram of the calculation process of the preferred embodiment of the present invention, figure 2 Shown is a schematic diagram of a calculation model of a preferred embodiment of the present invention. The method for calculating the force and deformation of a servo support system using a modified stiffness matrix proposed in the present invention includes the following steps:
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The invention provides a method for calculating the stress deformation of a servo supporting system adopting a modified stiffness matrix, which comprises the following steps of: (1) establishing a simplified model of an elastic foundation beam according to actual engineering; (2) establishing a control balance equation of the elastic foundation beam of the servo system; (3) correcting the supportstiffness matrix according to the working condition type: if the support stiffness matrix is not corrected normally, if the servo support is installed or regulated, deducting the supporting rigidity in the supporting rigidity matrix, and updating the input regulating threshold value in the pre-added shaft force matrix; and (4) substituting the modified support stiffness matrix and the axial forcematrix into the equilibrium equation to solve the stress deformation of the wall after adjustment, and updating the wall displacement and pre-axial force matrix of the support. The method combines theelastic foundation beam method and the finite element method to correct the support stiffness matrix in the equilibrium equation according to the servo control, and proposes a calculation method forthe force deformation of the support system under the control of the servo system, which has the advantage of high calculation efficiency, high precision and programmable capability.
Description
Technical field [0001] The invention relates to the field of simulation calculation of force and deformation of foundation pit engineering, and mainly relates to a method for calculating force and deformation of a servo supporting system adopting a modified stiffness matrix. Background technique [0002] With the development of underground space in big cities, the situation that deep foundation pits such as subway stations are adjacent to existing buildings has become more frequent, which makes the protection requirements for the surrounding environment of foundation pit excavation and construction continue to increase. In projects with strict requirements for the deformation control of the ground connecting wall, the traditional steel support cannot meet the control requirements due to passive force. The stress compensation support under servo control is used more in the project (that is, the axial force can be actively applied to the enclosure. Structure) to ensure the deformat...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20G06F2119/06
Inventor 李明广黄彪侯永茂陈锦剑马元王建华
Owner SHANGHAI JIAO TONG UNIV