Water-air two-phase flow simulation experiment device for two-layer medium and using method of water-air two-phase flow simulation experiment device

Abstract

The invention discloses a water-air two-phase flow simulation experiment device for a two-layer medium. The device comprises a simulation tank, wherein the simulation tank is divided into three cavities including surface water simulation cavities in two sides and a simulation box; the simulation box is filled with a strong-seepage medium and a weak-seepage medium from bottom to top, a plurality of observation tubes and insertion tubes are arranged on the outer wall of the simulation box in one-to-one correspondence, the bottom of each observation tube is communicated with the corresponding insertion tube through a hose, and the insertion tubes are located in different positions of the side surface of the strong-seepage medium. The insertion tubes are inserted into the strong-seepage medium above the ground water level for pressure change observation, and the insertion tubes at the middle-lower part facilitate observation of ground water level change; lifting devices are mounted outside the simulation tank, and fixed-water-head overflow boxes are arranged on the lifting devices to control the surface water level, a tracer filling tube is arranged in the strong-seepage medium, and ascending rules of capillary water are observed. According to the water-air two-phase flow simulation experiment device, the air pressure in a vadose zone is measured according to the stabilized water head differences of U-shaped piezometer tubes, change rules of the air pressure along with time is captured, and the dynamic features of the ground water level after the pressure change are observed according to the water level change of ground water level observation tubes, and the water-air action mechanism is researched.

Description

technical field [0001] The invention relates to the technical field of groundwater dynamics in hydrogeology, in particular to a double-layer medium water-gas two-phase flow simulation experiment device. Background technique [0002] In the field of hydrogeology, a double-layer medium is generally considered to be a composite hydrogeological structure in which the upper layer has weaker permeability and the lower layer has relatively strong permeability, and it exists widely in nature. For example, the terraces on both sides of the river in the plain area are covered by a thin layer of clay and underneath a layer of sand pebbles and gravel, forming a typical dual structure; for example, the Mesozoic Jurassic and Cretaceous strata, due to the special depositional environment, form mudstone A typical double-layer structure covered on sandstone; another example is urban road fill, which can also form a double-layer structure with weak upper and lower penetration. Groundwater ca...

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Problems solved by technology

[0005] After the groundwater level changes in the double-layer medium, the water-air interaction driving process is complex and difficult to study. If computer simulation is used as a research method, it is not easy to understand the whole process of the air pressure in the medium evolving with time, and it is impossible to measure and capture important factors. Experimental phenomena and hydrogeological information, after generalizing the hydrogeological conceptual model, the calculation results are ambiguous, which brings great difficulty to people's understanding and research on the mechanism of water-air interaction in the vadose zone

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