A method for making a composite material pipe gallery model in a geotechnical centrifuge

Abstract

The invention belongs to the technical field of geotechnical engineering experiments, and discloses a method for making a composite material pipe gallery model in a geotechnical centrifuge. The material A whose elastic modulus is greater than the concrete used in the solid pipe joint is selected as the sheet body; the elastic modulus is selected to be smaller than that of the solid pipe gallery. The concrete material B used for the pipe joint is made as the main body; by determining and correcting the size of the main body and the sheet body, the sum of the bending stiffness of the main body and the sheet body on the neutral axis is equal to the equivalent bending stiffness of the section of the reduced-scale pipe joint; Fit the sheet to the main body to make a scaled pipe joint; multiple scaled pipe joints are connected to form a model pipe gallery, and rubber pads are installed at the joints of the scaled pipe joints. According to the principle of stiffness equivalent, the ratio of the section bending equivalent rigidity of the manufactured pipe gallery model to the section bending stiffness of the prototype pipe gallery is 1 / N 4 , so the geotechnical centrifuge test has a similar deformation field to the actual situation.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering experiments, and in particular relates to a method for making a reduced-scale model of a pipe gallery under the condition of equivalent stiffness, which is suitable for use in a narrow space in a centrifuge. Background technique [0002] The basic principle of the centrifuge model test is to make a scaled model of the prototype structure or components in a certain proportion, place it in the high centrifugal stress field generated by the high-speed rotation of the main shaft of the centrifuge, increase the physical force on the scaled model, and make the scaled model The model is expanded by a certain multiple of physical force and surface force, and shows a deformation process similar to the prototype structure or component. The conversion relationship between the expansion factor N and the rotational speed rpm is: [0003] N=1.11×10 -5 ×R×(rpm) 2 / g (1) [0004] In the formu...

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Problems solved by technology

[0012] The invention focuses on solving the problem of equivalent rigidity of the model under the condition of scale reduction in the centrifuge, and provides a method for making a composite material pipe gallery model in the geotechnical centrifuge, which can realize the scale model and the prototype pipe gallery in the centrifuge test The deformation situation is as similar as possible

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