Experiment table using magnetic field force to change volume weight of cement sand and gravel dam model test piece

Abstract

The invention discloses an experiment table using magnetic field force to change the volume weight of a cement sand and gravel dam model test piece. The experiment table comprises a dam body model test piece and an experiment table body, wherein the main aggregate of the dam body model test piece is iron powder, the experiment table body is provided with a magnetic field groove, and the experimenttable body at the left side of the magnetic field groove is provided with a pressure applying unit; and a magnetic field unit is arranged in the magnetic field groove, the magnetic field unit comprises a base, a thin film supporting plate and a permanent magnet, and the dam body model test piece is fixed to the thin film supporting plate. The experiment table is simple in structure and convenientto use; and the volume weight of the dam body model test piece 1 is changed by changing the magnetic field intensity of the experiment table through the permanent magnet, the actual stress conditionof a dam body prototype is better met, and the materials of the experiment table, the base and the thin film supporting plate belong to diamagnetic substances so that the magnetic effect of the permanent magnet cannot be changed, and therefore, the experimental data is more accurate.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering model tests, and in particular relates to a test bench device for changing the bulk density of a cemented sand and gravel dam model test piece by utilizing magnetic field force. Background technique [0002] The model test is to make the prototype structure into a model according to the principle of similarity. The model must not only simulate the actual working conditions of hydraulic structures or other forms of buildings, but also consider complex mechanical conditions. Model test is a commonly used physical simulation method. It is mostly used for engineering tests with large volumes and complex constructions where physical tests cannot be carried out, such as cemented sand and gravel model tests, earth-rock dam geotechnical model tests, etc. According to the similarity theory, the physical phenomena that occur on the prototype are reduced (magnified) according to the similarity re...

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Problems solved by technology

[0012] In conventional experiments, the bulk density of the model specimen is usually changed by hanging a heavy object outside the specimen, but this method makes the force on the model specimen a point, and the force of the suspended weight does not act uniformly on the whole. The model test piece does not conform to the actual stress situation, resulting in large experimental errors; and due to the large experimental errors, in routine tests, it is often necessary to measure more sets of test data to reduce the errors caused by the limitations of the test equipment, so that not only It increases the consumption of experimental materials, increases the cost of the test, and also leads to a longer test period, which affects the progress of the experiment and the development speed of related disciplines

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