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

A technology of cemented sand and gravel dams and test benches, which is applied in hydraulic models, hydraulic engineering, sea area engineering, etc., can solve the problems of the development speed of related disciplines that affect the progress of experiments, increase the consumption of experimental materials, and do not meet the actual force conditions, etc. problem, to achieve the effect of simple structure, convenient operation and reduced error

Inactive Publication Date: 2020-08-25
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a kind of experimental bench that utilizes magnetic force to change the bulk density of cemented sand and gravel dam model specimens, such as figure 1 and figure 2 Shown includes a dam body model specimen 1 and a test bench 2 with a rectangular parallelepiped structure. The aggregate component of the dam body model specimen 1 is iron powder. The material is a diamagnetic substance.

[0042] Such as Figure 3-6 As shown, the magnetic field groove is provided with a magnetic field unit, the magnetic field unit includes a base 61, a film support plate 62 and a permanent magnet 63, the base 61 is a gypsum material base, the base 61 is bonded to the middle of the bottom of the magnetic field groove 4, and the top of the base 61 There is a magnet installation groove 611 downwards in the middle of the end face, and the permanent magnet 63 is matched and inserted into the magnet installation groove 611 of the base 61. Since the material of the base 6...

Embodiment 2

[0067] The difference between embodiment 2 and embodiment 1 lies in the way of fixing the film support plate.

[0068] Such as Figure 7 As shown, the test bench 2 at the notch of the magnetic field groove 4 is fixed with a fixed limit frame 64, and the diameter of the inner frame mouth of the fixed limit frame 64 is greater than the size of the notch of the magnetic field groove 4, and the magnetic field groove 4 is located at the fixed limit. In the position frame 64, the film support plate 62 is matched and installed in the fixed limit frame 64. Since the diameter of the inner frame opening of the fixed limit frame 64 is greater than the size of the magnetic field groove 4 notches, the film support plate 62 is directly blocked. On the magnetic slot 4.

[0069] Compared with Embodiment 1, the film support plate 62 on the test bench of this embodiment is matched and installed in the fixed limit frame 64, and it is not necessary to use glue to fix the film support plate 62. W...

Embodiment 3

[0071] The difference between embodiment 3 and embodiment 2 lies in the way of fixing the film support plate.

[0072] Such as Figure 8 As shown, the test bench 2 of this embodiment is formed by direct pouring of concrete, which is characterized by high strength and low manufacturing cost. The middle part of the upper end surface of the test bench 2 is provided with a magnetic field groove 4 downwards, such as Figure 9 As shown, the upper mouth of the magnetic field groove 4 is provided with a ring frame groove 65 outwards along the groove wall, and the magnetic field groove 4 and the ring frame groove 65 are all reserved grooves preset when pouring the test bench 2, which is the same as that of the embodiment. 2. Compared with the slotting method of the magnetic field slot 4, the device of this embodiment reduces the slotting time of the magnetic field slot 4 and saves time and cost.

[0073]When in use, the film support plate 62 is directly matched and blocked and install...

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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...

Claims

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Application Information

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IPC IPC(8): E02B1/02E02B7/02
CPCE02B1/02E02B7/02
Inventor 张宏洋丁泽霖姚亮孟垚张先起梁士奎郑志文聂永博何绍宇王涛
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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