Physical model test device for studying piping failure process and test method

Abstract

The invention discloses a physical model test device for studying the piping failure process and a test method. The physical model test device comprises a water supply device, wherein the water supply device is connected with the bottom of a transparent or semitransparent model box through a water supply pipe; a test specimen and a buffer layer used for eliminating the impact effect of a water flow on the test specimen are laid in the model box from top to bottom; a plurality of seepage pressure sensors and a plurality of strain sensors are distributed in the test specimen from top to bottom and are connected with a seepage pressure and strain control box; and the seepage pressure and strain control box is connected with a computer. According to the physical model test device, with arrangement of the buffer layer, direct impact of the water flow on the test specimen is eliminated, the integrity of the test specimen and the accuracy of data measured by the seepage pressure sensors and the strain sensors are effectively ensured; and with arrangement of different water level control valves, the water level height in the water supply device is regulated, the size of a water supply head is regulated, and thus data under water supply heads in different sizes is measured.

Description

technical field [0001] The invention relates to underground engineering and hydraulic structures, in particular to a physical model test device and a test method for studying the damage process of piping. Background technique [0002] When underground engineering and hydraulic structures are under the water surface for a long time, they are subjected to the seepage of groundwater, and seepage instability and damage often occur, and the change of groundwater level in a certain area is small, which can be considered as constant head seepage. Piping is the most common phenomenon of structural seepage instability failure, and it has always been the focus of hydraulic research because of its great harm. However, due to its complexity and randomness, field tests are almost impossible. Therefore, indoor physical model tests are often used to study piping phenomena. [0003] The principle of physical model test is relatively simple, the phenomenon is intuitive, and the conclusions ...

AI Technical Summary

Problems solved by technology

At present, numerical methods for simulating the piping failure process usually cannot consider the soil-water interaction caused by particle loss, so they cannot fully explain the formation and development process of piping failure; at the same time, the existing piping failure model tests usually cannot effectively eliminate the gravity The impact on water flow deviation, and the existing test methods cannot realize the real-time observation of the whole process of soil deformation in the process of piping damage, but simply obtain the critical hydraulic gradient parameters, which cannot describe the development process of piping damage in detail. Reproduce the real process of the formation and development of piping damage, so it cannot meet the needs of research on the piping damage process

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