A head pressure control system and device for pinhole penetration deformation test

Abstract

The present invention discloses a water head pressure control system and an apparatus for a pinhole seepage deformation test. The water head pressure control system comprises a water storage device and water supply pipes for supplying water for a seepage deformation device, wherein the water supply pipes comprise a water supply main pipe and at least a water supply branch pipe communicated with the water supply main pipe, one end of the water supply main pipe is communicated with the water storage device, the other end is communicated with each water supply branch pipe, the water supply main pipe is further provided with a water drain pipe, each water supply branch pipe end being not connected with the water supply main pipe is respectively communicated with the water inlet pipes in each seepage deformation device, the water supply main pipe is sequentially provided with a metering pump, a first accumulator, a speed regulating valve, a pressure reducing valve, a second accumulator and a pressure gauge, the water drain pipe is arranged between the first accumulator and the speed regulating valve and is provided with an overflow valve, and each water supply branch pipe is provided with a shut-off valve and a pressure gauge. According to the present invention, the structure of the apparatus is simple, the seepage deformation water pressure during the experiment process can be continuously, stably and accurately controlled, and the reliability of the experimental data can be improved.

Description

technical field [0001] The invention relates to an anti-infiltration deformation test device, in particular to a water head pressure control system and device for a pinhole infiltration deformation test. Background technique [0002] The pinhole penetration deformation test is used in the karst collapse test to test the resistance to penetration deformation and damage of soils with cracked surfaces or large pores. The currently used test water head pressure control system mainly uses water tanks or water pumps to supply excess water, and controls the height of the free water surface by raising or lowering the inlet pipe port, thereby realizing the control of the head pressure entering the osmotic deformation device. Its shortcomings are: the test process needs to continuously lift and lower the water inlet pipe, which is cumbersome to operate and takes up a lot of space; the lifting height is limited by the site, and the range of pressure provided is limited. The higher the ...

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Problems solved by technology

Its shortcomings are: the test process needs to continuously lift and lower the water inlet pipe, which is cumbersome to operate and takes up a lot of space; the lifting height is limited by the site, and the range of pressure provided is limited. The higher the pressure, the more difficult it is to control with high precision, which affects the test range and accuracy of the test

In this invention, the booster pump and the automatic water flow regulating valve are provided to ensure that the osmotic deformation instrument is provided with constant head, large flow rate and stable pressure to a certain extent. The osmotic deformation water ensures that the experimental data is more accurate and stable than the existing traditional technology, but Only by setting the outlet pressure of a regulating valve is difficult to achieve a constant water head pressure throughout the experimental process. In addition, the opening and closing of the pump and the regulating valve will inevitably lead to pulse fluctuations in the system pressure, and the accuracy of the experimental data will inevitably be affected; In addition, The constant head pressure system constructed by the booster pump and the regulating valve lacks a pressure system protection device, which is likely to cause damage or failure of the pump or regulating valve, resulting in safety hazards and interruption of experiments; moreover, the device can only realize a set of anti- Penetration deformation test, it is difficult to conduct multiple tests at the same time, and the efficiency is relatively low

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