Test device and test method for simulating contact scour development process of soil body

Abstract

The invention discloses a test device for simulating the contact scour development process of a soil body. The test device comprises a transparent model box; a transparent soil sample is arranged in the transparent model box; a planar laser-induced fluorescence system, an image acquisition system and a pore pressure acquisition device are arranged on the periphery of the transparent model box, wherein the planar laser-induced fluorescence system is used for obviously distinguishing the contact surface between a solid phase and a liquid phase of the transparent soil sample and the contact surfaces among different particle sizes of the transparent soil sample, the image acquisition system is used for recording the contact scour development in the test process, and the pore pressure acquisition device is used for measuring water heads at the positions with different seepage path lengths in the test sample; and a water inlet and a water outlet of the transparent model box are connected with a circulating water supply system. The invention further discloses a test method for simulating the contact scour development process of the soil body. According to the test device and test method for simulating the contact scour development process of the soil body, the change of the hydraulic gradients at different positions of the sample and the change of the flow velocity are analyzed, a pore distribution curve and the intuitive test phenomena and image analysis are combined so as to comprehensively evaluate whether contact scour happens to the soil body or not, and therefore a basis isprovided for the reasonable design of hydraulic engineering and geotechnical engineering.

Description

technical field [0001] The invention relates to a seepage model test device and a test method, in particular to a test device and a test method for simulating the development process of soil contact scour, belonging to the field of seepage tests in geotechnical engineering. Background technique [0002] Generally speaking, the erosion damage of surface water flow is relatively easy to find and rescue, while the seepage erosion of groundwater is difficult to observe and discover, and is often ignored. Once a problem occurs, it will quickly lead to project damage and is difficult to remedy. According to domestic and foreign statistical analysis, accidents or failures of earth-rock dams due to seepage damage account for 30% to 40% of the total, while contact erosion damage accounts for a large proportion. Therefore, the problem of contact erosion has attracted more and more attention of engineers and scholars. Contact erosion refers to the phenomenon that seepage water flows a...

AI Technical Summary

Problems solved by technology

However, the current contact erosion test research is generally based on a scaled-down model, supplemented by relevant monitoring methods, and often obtains information on the boundary surface (apparent) or a small number of

Images