Permeation measuring device and method for layered sand migration process under different osmotic gradients

Abstract

The invention discloses a permeation measuring device and method for layered sand migration process under different osmotic gradients. The main structure of the device comprises a water supply system,a sample permeation chamber, a water head measuring system and a flow measuring system, wherein the water supply system mainly comprises a water pump, a water supply valve, a water pipe, a flow control valve, a water storage tank and a safety relief valve, wherein the sample permeation chamber mainly comprises an acrylic cover plate, an O-type seal ring, a permeable stone, a 500-mesh filter, a bolt and an organic glass tube; the water head measuring system mainly comprises a PVC hose, a bellows water pressure gauge and a quick-connect fitting; and the flow measuring system mainly comprises anautomatic exhaust valve, a support grid, an atmospheric pressure water storage tank, a water pipe, a water stop valve and a rotameter. The device provided by the invention can simulate the sand seepage test under different conditions, and can meet the requirements of the experimental research on the piping, osmotic deformation and osmotic failure as well as the sand seepage test in other geotechnical engineering at the same time, which is particularly suitable for seepage test of layered sand samples under the gradient changed water pressure condition.

Description

technical field [0001] The invention belongs to the field of rock-soil seepage mechanics, and in particular relates to a seepage measuring device and method for measuring the migration process of layered sand under different seepage gradients. Background technique [0002] The permeability of sand is one of the important technical indicators in the field of civil engineering and geotechnical engineering, and it is generally expressed by the permeability coefficient. After obtaining the permeability coefficient of a certain sandy soil, it has a guiding effect on the study of the seepage deformation and seepage damage of the sandy soil. Due to the influence of many factors, the current seepage test research still has the following problems: [0003] Most of the existing sand permeability coefficient measurement devices adopt an integrated sample loading method, and most of them can only be used to measure the permeability coefficient of a certain sand under a certain water he...

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Problems solved by technology

The traditional seepage device cannot realize the function of sampling after seepage, so it is impossible to study the influence of particle migration and sand structure on the change of seepage characteristics

[0004] Previously, there were no patents or literature records on the device that is suitable for measuring the permeability coefficient of layered sand under different water head conditions, and can be used to study particle migration, seepage deformation, and mechanical properties of sand after seepage

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