Negative pressure osmosis test device

Abstract

The invention discloses a negative pressure osmosis test device which comprises a base, a soil sample ring, a porous permeable stone, a water storage container, an electronic balance, a vacuum pump, a pressure gauge and a sealed container, wherein the soil sample is arranged in the cylindrical soil sample ring, the upper end of a sample is connected with the water storage container, and the bottom end of the sample is connected with the sealed container and the vacuum pump; a pressure difference is formed at two ends of the soil sample through vacuum-pumping, and water seeps in the soil sample under the action of the pressure difference; an osmotic coefficient of the soil sample can be obtained through calculating the amount of water passing though the soil sample in unit time; a load applying piston at the upper end of the sample can apply vertical load so as to solidify the soil; osmosis tests of different solidifying pressures can be performed to simulate the seepage of the practical field soil under different stress environments; the osmosis test can be directly performed on the prepared soil sample. Therefore, the test device has the advantages of simple structure, convenience in use, quick and convenient test, and obviously shortened test time, and is particularly suitable for the osmosis test of low-osmosis soil samples.

Description

technical field [0001] The invention relates to a rock-soil mechanics test technology, more specifically a test device for testing the permeability of rock-soil media, especially low-permeability soil samples. Background technique [0002] The permeability of soil is one of its important physical and mechanical properties. Soil seepage stability is a common concern in soil mechanics and engineering geology. According to the test principle, there are two main types of indoor permeability test methods: constant head method and variable head method. [0003] The constant water head method test is generally used for the test of coarse-grained soil, and the variable water head method is generally suitable for the test of fine-grained soil. However, for some highly compacted cohesive soils with very low permeability, it takes a very long time for the seepage water flow to reach the normal seepage state, and it takes a long time to obtain a small amount of seepage water, so the t...

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Problems solved by technology

However, for some highly compacted cohesive soils with very low permeability, it takes a very long time for the seepage water flow to reach the normal seepage state, and it takes a long time to obtain a small amount of seepage water, so the test process is very slow, and the obtained test data not precise

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