Permeation test device

Abstract

The invention discloses a penetration test device, which comprises a test barrel (1), a filter assembly (6) and a test assembly, wherein the test barrel (1) is used for accommodating a test soil sample for penetration test; the filter assembly (6) is arranged in the test barrel (1), and the periphery of the filter assembly (6) abuts against the inner surface of the side wall of the test barrel (1) and is used for filtering moisture in the test soil sample; and the test assembly is connected with the test barrel (1) and used for carrying out a penetration test on the test soil sample. The penetration test device is characterized in that an air pressure curtain assembly (5) located above the filter assembly (6) is further arranged in the test barrel (1), the periphery of the air pressure curtain assembly (5) abuts against the inner surface of the side wall of the test barrel (1), and the air pressure curtain assembly (5) is used for forming an air pressure curtain layer in the test soil sample.

Description

technical field [0001] The present application relates to the field of soil sample penetration test, in particular to a penetration test device. Background technique [0002] Water-rich and weak strata have the characteristics of high water pressure, low bearing capacity, weak stability, complex seepage paths, and various distribution forms. Often accompanied by structural or geological disasters, major accidents also occur from time to time. [0003] Therefore, in order to realize the research and development of tunnel engineering construction technology in water-rich and weak strata, it is necessary to clarify the permeation law of pressurized gas in water-rich strata and grouting curtains, and the water-repelling mechanism of pressurized gas. According to the relevant provisions of Clause 16 of the "Soil Testing Standard" (GBT 50123-2019), for the test purpose of the air pressure curtain water-proof condition, the test equipment that can be applied at this stage is gener...

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Problems solved by technology

[0004]1. Conventional test equipment cannot meet the test conditions of the air pressure curtain. The application of air pressure load was not considered at the beginning of the test design, and the test is limited to the liquid-solid coupling dimension. There is no way to expand to the solid-liquid-gas three-phase coupling dimension;

[0005]2. The constant water head test equipment is suitable for coarse-grained soil and the variable water head test is suitable for fine-grained soil, but the water-rich soft soil layer has a complex structure and is often accompanied by interlayers It appears that a single device cannot perform accurate tests on soil samples in water-rich soft soil layers;

[0006]3. Unable to observe the permeation path of gas in the test soil sample, lack of microscopic observation method;

[0007]4. The size of the conventional test equipment is very small, the size effect and the side wall effect are obvious, and the original soil structure is destroyed by the reconstruction of the soil sample, and the soil permeability cannot be accurately measured reality;

[0008]5. Lack of consideration for the loading and unloading of large-volume test soil samples, making it difficult to change working conditions; and

[0009]6. The test device is opaque, and the degree of informatization and visualization is not high

[0010] For the above technical problems, no effective solution has been proposed yet

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