Subsurface erosion visualization test device and method, and transparent soil preparation method

A test device and transparent soil technology, which is applied in the field of soil mechanics test, can solve the problem that the movement of fine particles in the soil cannot be observed, and achieve the effect of easy control of relative density, convenient operation and low cost

Pending Publication Date: 2021-06-08
HOHAI UNIV
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  • Application Information

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Problems solved by technology

However, the PIV-based testing technology can only observe the movement trajectories of a limited number

Method used

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  • Subsurface erosion visualization test device and method, and transparent soil preparation method
  • Subsurface erosion visualization test device and method, and transparent soil preparation method
  • Subsurface erosion visualization test device and method, and transparent soil preparation method

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Embodiment Construction

[0038] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0039] A latent corrosion visualization test device includes a permeation meter, a pressure applying device, a laser control system and an image acquisition system.

[0040] Such as figure 1 As shown, wherein the permeameter is provided with a transparent model box 30, which is a square barrel made of acrylic plate, with a light transmittance>92%; a full transparent soil sample 29 is placed inside it, and the transparent soil test sample Sample 29 is configured by fused silica sand particles and pore oil, wherein a fluorescent dye is added to the pore oil, and the fluorescent dye is Nile Red. Preferably, the size of the transparent soil sample 29 is 100 mm×100 mm×150 mm mm (length × width × height) and 200 mm × 200 mm...

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Abstract

The invention discloses a subsurface erosion visualization test device and method, and a transparent soil preparation method. Fused quartz sand particles are used for replacing soil particles, oil with the same refractive index as the quartz sand particles is prepared for replacing water, and a fluorescent dye is added into the oil, so that a transparent soil sample is prepared; the transparent soil sample is irradiated by using a solid-state green laser based on a planar laser-induced fluorescence technology, oil emits bright fluorescence in a laser irradiation plane by using the fluorescent dye, and fused quartz sand particles appear in the form of black spots; and in the occurrence and development process of subsurface erosion, a high-speed camera is used for shooting laser pictures in real time, the visualization of mechanical behaviors such as fine particle migration and clogging in the transparent soil sample can be realized by analyzing the laser pictures at different positions of the sample under different hydraulic conditions, and meanwhile, the evolution process of the internal pore structure of the transparent soil sample can be obtained.

Description

technical field [0001] The invention belongs to the technical field of soil mechanics test, and in particular relates to a latent corrosion visualization test device, a test method and a preparation method of transparent soil. Background technique [0002] Latent erosion refers to the phenomenon that seepage carries the fine particles in the internal unstable soil to migrate in the pores formed by coarse particles, and gradually forms a part of the foundation that is hollowed out and partially filled. The wide-graded soils with relatively gentle tails of the grading curves and the soils lacking intermediate gradings belong to the internal unstable soils. The development of subsurface corrosion to a certain extent may cause uneven settlement of the foundation or damage the anti-seepage system of the dam, threatening the safety of the dam. The Tarbela Dam in Pakistan, the Bennett Dam in Canada, and a dam in Sichuan Province in my country have all caused serious accidents due ...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N1/38G01N1/28G01N1/36
CPCG01N15/0826G01N15/08G01N15/0806G01N1/38G01N1/28G01N1/286G01N1/36G01N2015/0846
Inventor 罗玉龙王珂张兴杰谷敬云张海彬盛金昌詹美礼
Owner HOHAI UNIV
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