A quick saturation device for soil engineering model test

Abstract

The invention relates to a rapid saturation device for a geotechnical model test. The device is a vacuumizing saturation device integrating a model test box and a sealing saturation box, and comprises a saturated liquid mixing barrel (1), a saturated liquid inlet pipe (6), a liquid pump (7), an air outlet pipe (27), a sealing gas-liquid separation barrel (31), a vacuum pump (35) and a model test box, wherein the saturated liquid mixing barrel (1) is sequentially connected with the liquid pump (7) and a liquid inlet of the model test box through the saturated liquid inlet pipe (6); and a gas outlet of the model test box is sequentially connected with the sealing gas-liquid separation barrel (31) and the vacuum pump (35) through the air outlet pipe (27). Compared with the prior art, the device provided by the invention has the advantages of rapid and controllable saturation, good saturation effect and low manufacturing cost, and is not limited by the size of the model test; and meanwhile, the device also can be applied to the percolation model test and the measurement of soil permeability coefficient and particularly the permeability coefficient of large-particle soil body such as gravelly soil and sandy gravel.

Description

technical field [0001] The invention relates to a quick saturation device for geotechnical model tests, which can be used for fast saturation of geotechnical models, simulated seepage tests and measurement of soil seepage coefficient. Background technique [0002] Geotechnical model test is one of the basic means of geotechnical engineering research. It is inevitable to saturate the geotechnical model in the test, and the saturation degree of the model soil sample has a great influence on the experimental results. In general, only one component of saturated liquid is degassed saturated liquid. In special cases, such as using centrifugal test to study the change of rock and soil properties under earthquake load, it is necessary to use liquid with high dynamic viscosity coefficient to simulate The force situation in the prototype, so in this case it is necessary to configure the viscous saturated liquid with multiple components. At present, there are three commonly used satur...

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Problems solved by technology

[0003] However, the rainfall method in a saturated liquid to form a saturated geotechnical model method is only suitable for sandy soils, and it is difficult to form high-density soils

However, the saturated liquid saturation method at the bottom of the geotechnical model is difficult to detect its saturation effect. If the saturated liquid is filled too fast, the air cannot be discharged in time, and most of the gas will be sealed in the soil; if the saturated liquid is filled slowly, then It takes a long time. At the same time, for the deep geotechnical model, it is necessary to fill the saturated liquid with high pressure, which will inevitably cause local seepage damage to the soil near the saturated liquid injection port.

Although the saturation speed of the vacuum saturation method is fast and the effect is good, it is generally necessary to make an additional sealed saturation box, which is expensive and inconvenient to transport and move, and is not suitable for large-volume model tests. At the same time, it is inevitable during the transport process cause some disturbance to the soil

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