A test platform for salt migration in groundwater under variable water head conditions

Abstract

The invention discloses a transfer and test platform of salt in underground water under a condition of a variable water head. The transfer and test platform comprises a column body (1), wherein two filter plates (100) are fixed in the column body (1), a first sand layer (2), a first clay layer (3), a second sand layer (4), a second clay layer (5), a third sand layer (6), a third clay layer (7), and a fourth sand layer (8) are arranged between the two filter plates (100) in sequence from top to bottom, and a solution cavity (a) is reserved between the upper top surface of the first sand layer (2) and the top edge of the column body (1). A pressure transmission curve of solution permeation can be drawn according to underground water pressure applied by upper part, so as to analyze a relationship between permeation rate and effective pore pressure; blocking and ion exchange role of different clays on salt can be analyzed by using electrical conductivity change trends of different layers;and a solute penetration curve can be drawn according to concentration of solution discharged from bottom, porosity, time and other parameters, so as to analyze impact of clay on salt transfer.

Description

Technical field[0001]The present invention relates to the technical field of experimental equipment, and is specifically related to a platform for simulating the seepage characteristics of underground water salts in multilayer aqueous layer systems.Background technique[0002]Salt translational research in multilayer aquifer systems is an important part of water quality evaluation and water resource utilization. In the past, the salinavailable migration was multi-test field monitoring, indoor earth column simulation method.[0003]The in situ test is a region where the soil conditions and the aquifer conditions are selected, and a deep test trench is excavated according to the expected target, or the test prototyfire is built, and the profile of the test is determined; and the sensor is placed on the test profile to monitor the conductance of the in situ condition. The parameters such as water, water content, and water are used for subsequent model analysis. In situ test methods require...

AI Technical Summary

Problems solved by technology

Due to space constraints, the height of the test column is generally within 3m, the effective water head difference is small, the size of the water head cannot be changed quickly, and it is difficult to simulate the salt migration under the condition of large buried depth

The evaporation of exudate is also less considered in the test, which will have a significant impact on subsequent tests

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