Multi-union flexible wall permeameter with infinite volume injection under graded confining pressure and test method

Abstract

The invention provides a multi-union flexible wall permeameter with infinite volume injection under graded confining pressure and a test method, which belong to the field of flexible wall permeameters. The multi-union flexible wall permeameter comprises a pressure supply system, an infinite volume injection system, a graded confining pressure temperature-controllable permeation system and an automatic percolate monitoring and collecting device. The infinite volume injection system comprises a plurality of groups of same infinite volume injection devices, the graded confining pressure temperature-controllable permeation system comprises a plurality of same graded confining pressure temperature-controllable permeation devices, and permeation tests under various set temperatures, various set liquid confining pressures and various set injection pressures can be simultaneously carried out. According to the flexible wall permeameter, the determination of the permeability coefficient under different confining pressure states is realized, the functional defects of the existing flexible wall permeameter are overcome, and more manpower and time are saved.

Description

technical field [0001] The invention relates to the field of flexible wall permeameters, in particular to a multi-connected flexible wall permeameter and a test method for realizing infinite volume injection under graded confining pressure. Background technique [0002] In an isotropic medium, the permeability coefficient is defined as the unit flow rate under the unit hydraulic gradient, which indicates the difficulty of fluid passing through the pores. The larger the permeability coefficient, the stronger the water permeability. In the field of environmental rock and soil, the permeability coefficient is an important index to comprehensively reflect the permeability of soil, and it is also a basic parameter that must be used in seepage calculation. Accurate measurement of soil permeability coefficient is a very important task. [0003] The permeability coefficient is mainly determined by the permeability test. Conventional instruments for measuring permeability coefficien...

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Problems solved by technology

However, the following issues during the test were not considered: the type of permeate, whether it will cause corrosion to the instrument, the injection and replenishment method of the permeate, the method of obtaining the permeate amount, etc., and the multi-connected flexible walls are all under the same confining pressure. It is impossible to carry out independent permeability tests under different confining pressures

[0007] To sum up, due to the difference of soil material and seepage fluid in the infiltration process, for example, when heavy metal or organic polluted liquid is used as the polluted liquid, in order to accurately measure the permeability coefficient, there may be longer infiltration time and more seepage liquid. To stabilize the penetration test, the existing flexible-wall permeameters cannot achieve unlimited permeation in the test process. Satisfy the requirements of the penetration test; in addition, the existing flexible wall permeameter design is relatively bulky, a set of flexible wall permeameter requires multiple instruments to match, that is, to conduct a penetration test of a sample requires the use of multiple instruments at the same time, and the process requires Manually monitor multiple parameters to judge whether the test is stable. The operation of the instrument is relatively complicated, the labor intensity is high, and the workload is heavy. At present, there is an urgent need for a multi-connected flexible wall permeameter that can realize infinite volume injection under graded confining pressure.

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