Undisturbed soil scouring test system

Abstract

A disclosed undisturbed soil scouring test system comprises a water pump, a water inlet pipe, a flow valve, a water inlet valve, a rectangular pipe, a water outlet pipe, two piezometric pipes, a pushing system, a pressure-regulating valve and a secondary settling basin; the water inlet of the water inlet pipe is connected with the water pump, the water outlet of the water inlet pipe is connected with the water inlet of the rectangular pipe, the water outlet of the rectangular pipe is connected with the water inlet of the water outlet pipe, and the water outlet of the water outlet pipe is connected with the secondary settling basin; the flow valve is disposed at the water inlet end of the water inlet pipe, and the water inlet valve is disposed on the water inlet pipe and at the downstream of the flow valve; the pushing system is communicated with the bottom of the rectangular pipe; the two piezometric pipes are disposed on the rectangular pipe and respectively at two sides of the pushing system; and the pressure-regulating valve is disposed at the water outlet end of the water outlet pipe. The undisturbed soil scouring test system is capable of generating a high-speed water flow for scouring undisturbed soil, and is applicable to research on incipient velocity of sediment in different particle sizes from sand grain to clay particle and undisturbed soil scouring rate tests.

Description

technical field [0001] The invention relates to an undisturbed soil scour test system, which belongs to the field of test methods. Background technique [0002] At present, there are generally two physical model test methods for studying the sediment start-up problem. One is to carry out the test by scouring the bottom sediment in the wind wave flow tank. Since the free surface in the tank is consistent with the actual river channel, the flow velocity distribution basically conforms to the same law as the actual channel, and the test results can be popularized and used; the second The first is to test in an annular water tank. The annular water tank is composed of an upper and lower plate and a speed control system. The height of the upper plate can be adjusted to control the water depth in the tank. The upper and lower plates rotate in reverse, and the water flow under the action of shear force simulates different flow rates and different sand concentrations. Sediment star...

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Problems solved by technology

In the wind wave flow tank, the high-speed water flow cannot be scoured, and the flow velocity in the existing annular tank can only reach about 2m / s. Therefore, in the above two tanks, only non-viscous or less viscous sediment starting flow rate can be carried out. Research

[0004] In addition, the erosion rate of soil samples cannot be obtained in the wind wave flow tank and the annular tank, and it is not convenient to carry out the original soil layer test. Some soil mechanical properties of the remolded soil or model sand used are the same as those of the prototype, but some are difficult to restore. Differences, unable to accurately describe the experimental phenomenon

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