Test device for testing horizontal and vertical saturated infiltration coefficients of coarse-grained soil simultaneously indoors under different pressure

Abstract

The invention discloses a test device for testing horizontal and vertical saturated infiltration coefficients of coarse-grained soil simultaneously indoors under different pressure. The device comprises a loading system, a water supply system, a soil sample chamber and a pressure measurement system, wherein the loading system comprises a reaction frame, a pressure adjusting valve, a gas-pressure meter and a double-layer loading plate; the double-layer loading plate is a hollow hexahedron and comprises an upper-layer porous plate, a lower-layer porous plate, a middle partition board and a sideinclined plate; the water supply system comprises a water supply tank, a water storage tank, a vertical water supply cavity formed by the double-layer loading plate, a left horizontal water supply cavity and a right horizontal water supply cavity; each of the left horizontal water supply cavity and the right horizontal water supply cavity is formed by an outer porous plate, an inner porous plate and a silicon base plate filling a gap between the two porous plates. The horizontal and vertical saturated infiltration coefficients of the same sample are simultaneously tested under different pressures, the test device is not required to be dismounted in the testing process, the test device is convenient to operate, and the testing efficiency and accuracy are greatly improved.

Description

technical field [0001] The invention relates to the technical field of soil sample permeability coefficient testing in geotechnical engineering, in particular to an indoor test device for simultaneously testing the horizontal and vertical saturated permeability coefficients of coarse-grained soil under different pressures. Background technique [0002] Soil permeability coefficient is an important index to evaluate soil stability and settlement characteristics, and its measurement accuracy is directly related to the safety of rockfill dam slopes, landfill piles and other projects. At present, the construction technology of paving the soil material layer by layer and then compacting it is often used in engineering in our country, which makes the geotechnical structure have an obvious layered structure, which in turn leads to a significant anisotropy in its permeability characteristics. [0003] At present, the test devices for testing the permeability coefficient of coarse-gr...

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Problems solved by technology

However, most of the above-mentioned indoor test devices can only test the vertical permeability coefficient of coarse-grained soil. Even if some can measure the horizontal permeability coefficient, it needs to be carried out on different samples, or the device needs to be disassembled during the test, which is complicated to operate and takes a long time to test. Long and poorly sealed

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