Gas-charging permeation prevention testing device for soil body and testing method thereof

Abstract

The invention provides a gas-charging permeation prevention testing device for a soil body and a testing method thereof. The device comprises a main body structure, gas charging equipment, flow seeping equipment and metering equipment, wherein the main body structure is internally provided with a main body space used for storing a soil sample, and comprises transparent top plate, bottom plate and cylinder; the top plate and the bottom plate are fixedly connected to two ends of the cylinders respectively; the top plate is provided with a gas-penetrable and water-impermeable hole and a gas outlet hole; the side wall of the cylinder is provided with convex holes according to an interval from top to bottom; the gas charging equipment is used for charging a gas to the soil sample; the flow seeping equipment is used for simulating the stable flow seeping working conditions of the soil sample under different water heads; the metering equipment is used for collecting and processing testing data, and comprises a pore water pressure sensor mounted in an upper convex hole, a pore gas pressure sensor mounted in a lower convex hole, a weighing device and a collecting device. The gas-charging permeation prevention testing device and the testing method thereof have the advantages that the stability is high, the operability is high, the engineering adaptability is high, and the like.

Description

technical field [0001] The patent of the present invention relates to a test device and test method for air-inflated seepage resistance of soil. The model test device is used to study the scientific laws of soil's effect on seepage resistance when inflated, and to provide scientific guidance for specific engineering practices. It belongs to civil engineering. The field of instrument testing. Background technique [0002] As a continuous porous medium, soil is permeable. Under the action of water level difference, water will flow through the pores of soil, which will cause various engineering problems. For example, in excavation projects such as foundation pits and tunnels, there is a common problem of groundwater seepage and drainage; on the contrary, in earth dams for the purpose of water storage, water loss due to infiltration will cause water retention; in addition, there are some Problems like the seepage of sewage cause groundwater pollution. In structures such as slo...

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Problems solved by technology

[0004] However, as a new technical means, air-filled anti-seepage requires further in-depth research in terms of theory and engineering application. At present, the research on air-filled anti-seepage is still in the qualitative stage of exploration. There are still many problems in the application that need to be studied and solved

For example, in order to achieve a better anti-seepage effect without obviously damaging the soil structure, it is necessary to determine a reasonable inflation pressure value, which is related to the type of soil, the porosity ratio of the soil, the moisture content, the seepage head, etc. The quantitative relationship has not yet been determined; in practical engineering applications, since the air pressure will attenuate in the soil, in order to determine the distance between two adjacent inflatable holes, it is necessary to determine the effective radius of influence of the air pressure, the effective radius of influence of the air pressure and the inflation pressure The quantitative relationship between the value, the diameter of the air hole, and the type of soil has not yet been determined; in order to determine how long it takes to form a stable and effective additional air pressure in the soil under different air pressures in different soils, it is necessary to study the air pressure The transfer effect of air pressure in the soil over time has not yet been recognized as a theoretical result; research has shown that if the soil is inflated for a limited time, a certain amount of gas will remain in the soil in the form of closed bubbles after the aeration is over. It has a great resistance to seepage, but how much pressure and how long different soils need to be inflated to achieve the best seepage resistance effect still needs to be studied

Due to the complexity of the soil, there are still many issues to be studied about the aeration barrier. At present, a set of test instruments and corresponding research methods for the above problems have not been established. Therefore, there is an urgent need for a study on the aeration barrier Experimental instruments and corresponding research methods

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