Soil sample erosion ratio washout test device

Abstract

The invention provides a soil sample erosion ratio washout test device. The soil sample erosion ratio washout test device comprises a control unit, a rack, a barrel body fixed on the rack, a water flow drive unit arranged on the rack, a soil sample bearing unit arranged fixedly relative to the barrel body, a circulating filtration unit in circuit connection with the barrel body, and an image collection unit which is connected with the control unit and is arranged corresponding to the soil sample bearing unit. The soil sample erosion ratio washout test device provided by the invention can be used for soil sample erosion ratio washout tests, is applicable to soil samples with relatively large particle diameter range, is wide in application range, and can avoid randomness of naked-eye observation results; and moreover, only one injection is needed in the whole test, the water using amount of the test is small, and the cost of the test can also be reduced.

Description

technical field [0001] The invention relates to the technical field of earth-rock dam failure research, in particular to a soil sample erosion rate scouring test device used for soil sample erosion measurement soil sample scouring tests of earth-rock dams. Background technique [0002] According to statistics, flooding is one of the main causes of earth-rock dam failures, accounting for about 49% of the total number of dam failures. Among them, hydraulic erosion is the inducement and leading factor of earth-rock dam overflowing. Therefore, the erosion rate of dam materials It is an important parameter in the study of earth-rock dam failure. [0003] At present, the commonly used method for measuring the erosion of soil samples in earth-rock dams is the launder test. The soil samples are used as channel substrate materials, and the erosion rate is measured by simulating water erosion. The most representative one is the ErosionFunction Apparatus (EFA) equipment of J.L.Briaud. ...

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Problems solved by technology

[0004] Although the erosion rate of soil samples can be obtained by using EFA equipment, due to its own structure and working principle, EFA equipment still has the following shortcomings. First, the equipment is expensive; second, due to the size of the sample loading equipment Shelby tube, it can only test The sample is composed of particles with a diameter less than 10mm; thirdly, during the test, it is judged by the naked eye whether the raised sample is washed away. The result is not accurate enough; Fourth, the EFA equipment ejects the sample through the piston. When the sample ejected by the piston is not enough to supply the scouring, that is, when the scouring speed is greater than the speed at which the sample is ejected, there is a gap in the measured scouring value. The upper limit value is equal to the maximum lifting speed of the piston, so the equipment cannot test samples with poor impact resistance such as non-cohesive soil

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