Device for measuring soil sample permeability coefficient in indoor soil engineering test

Abstract

The invention discloses a device for measuring a soil sample permeability coefficient in an indoor soil engineering test. The device comprises a water supply tank, a water pump, an electric control valve, a computer, a pressure sensor, a temperature sensor, a pressure water pipe and a sample tube for storing soil samples, the upper end of the pressure water pipe is communicated with the water supply tank through a water inlet pipe, the lower end of the pressure water pipe is communicated with the lower end of the sample tube, the water pump is mounted on the water inlet pipe, the electric control valve and the pressure sensor are mounted on a water outlet pipe, detected pressure and temperature are transmitted to the computer by the pressure sensor and the temperature sensor, and the computer controls opening and closing of the water pump and the electric control valve.

Description

technical field [0001] The invention relates to a device for measuring the permeability coefficient of soil samples in indoor geotechnical tests. Background technique [0002] The permeability coefficient is an important mechanical index of soil, which will be used to analyze the seepage stability of natural foundations, dams and foundation pit excavation slopes, determine the section of dams and calculate the seepage of dams and foundations, etc. Because the factors affecting the permeability coefficient are very complicated, such as the particle composition of soil, colloid content, structure state, density, mineral composition of soil particles and water, etc., are enough to affect its correct determination. The current permeability coefficient measured by various methods in the laboratory and on site is still a relatively rough value. In fact, the measurement method of the permeability coefficient is still under research and improvement. Different test methods should be...

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Problems solved by technology

The 70-type permeameter is mostly used indoors. Because of the pressure measuring hole, it can take values ​​in sections and check each other. It can also take the test results of the middle section with a relatively stable flow state. The disadvantage is that the cylinder body is made of metal, which is not easy to observe. The internal seepage of the sample is difficult to find and eliminate when there is gas accumulation. This shortcoming should be avoided when loading the sample.

[0005] It is not difficult to find out that the above-mentioned traditional permeability coefficient measurement methods all require manual calculation of the permeability coefficient, and according to the "Geotechnical Test Technical Manual", it is often necessary to repeat the measurement 5-6 times, and the permeability coefficient measured under different initial water heads is within the allowable When the difference is within the range, the test ends

It can be seen from this that the traditional method of measuring the permeability coefficient is labor-intensive and time-consuming. Due to its low efficiency, it is not conducive to the continuous operation of the test, and the accuracy is not necessarily accurate.

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