Multifunctional permeation piping tester

Abstract

The invention discloses a multifunctional permeation piping tester. The tester comprises a loading reaction frame and a sample cylinder; the sample cylinder is fixed by a support frame arranged on theloading reaction frame; an axial pressurizer is fixedly arranged at the top of the loading reaction frame; a sample cylinder top cap is arranged at the upper part of the sample cylinder; a water inlet of the sample cylinder top cap is connected with a pressure volume controller; a sample cylinder bottom cap funnel-shaped leaking groove is formed in the bottom of the sample cylinder; a water outlet of the leaking groove is connected with a sediment water filtering device arranged outside, water pressure sensors are uniformly arranged on the side wall of the sample cylinder from top to bottom,soil pressure gauges are arranged at the upper, middle and lower parts of the side wall of the sample cylinder, and porous permeation plates are arranged at the upper, middle and lower parts of a sample in the sample cylinder. The tester is controlled by a computer, is used for measuring parameters such as seepage velocity, permeability coefficient, pore water pressure, hydraulic gradient, effective stress and the like in the piping permeation process of coarse-grained soil and the action process of an inverted filter material, and is high in measurement precision, simple and convenient in measurement procedure and simple in measurement mode.

Description

technical field [0001] The invention relates to the technical fields of water conservancy engineering and geotechnical engineering, in particular to a multifunctional seepage piping tester. Background technique [0002] With the development of water conservancy and hydropower and the requirements for water resource safety, the seepage stability of coarse-grained soil is an important indicator of hydraulic engineering. Coarse-grained soil is the main filling material of earth-rock dams and embankments and filter material, and it is also one of the main research objects of soil mechanics. Under the action of seepage, the soil will produce internal erosion, form piping, seepage damage, and may eventually lead to project failure. Therefore, it is of great significance to study the permeability of soil, the mechanism of piping erosion and the performance of anti-seepage damage. Permeation is the phenomenon of liquid moving in porous media. The quantitative index expressed by th...

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Problems solved by technology

[0004] The invention solves the problems in the prior art that the occurrence process and mechanism of piping seepage erosion for coarse-grained soil and the mesoscopic changes of local soil are difficult to be completely, comprehensively and systematically characterized by various indoor seepage test instruments, and the experimental results are difficult to obtain. Objectively reflect the permeability characteristics and mechanical property change mechanism of coarse-grained soil in the process of piping seepage erosion, and provide a multi-functional seepage piping tester, which can perform reverse filtration on the protected soil (base soil)-reverse filter material Penetration test, testing the protected soil-reverse filter material composite soil layer, the permeability coefficient, seepage flow rate, sand output, axial stress, axial strain, pore water pressure, reaction Filtration seepage damage, and local hydraulic gradient changes, etc.

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