Stress field-temperature field coupled flexible wall soil column chemical permeation device and method

Abstract

The invention belongs to the technical field of geotechnical engineering, and particularly relates to a stress field-temperature field coupled flexible wall soil column chemical permeation device. The following scheme is put forward: the device comprises a test chamber, a confining pressure chamber, a precise liquid injection pump, an upper temperature controller, a lower temperature controller, a differential pressure sensor and a data acquisition instrument, the test chamber comprises a chamber top cover, a chamber base and a chamber wall, the chamber wall is located between the chamber top cover and the chamber base and connected with the chamber top cover and the chamber base through bolts, a sample base is welded to the upper portion of the chamber base, and a lower permeable stone, a sample, an upper permeable stone and a sample top cover are fixedly connected to the upper portion of the chamber base; the chemical permeable membrane efficiency coefficient, the diffusion coefficient and the retardation factor of the target pollutant of the geotechnical engineering material under the action of the stress field-temperature field are measured, meanwhile, the test method is also provided, the method is simple and easy to implement, the chemical permeable membrane efficiency coefficient, the diffusion coefficient and the retardation factor of the geotechnical engineering material can be jointly measured, respective determination is not needed, and the measurement efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a flexible wall soil column chemical infiltration device and method coupled with a stress field and a temperature field. Background technique [0002] Cohesive soils and other related geotechnical materials (such as GCL and CCL, etc.) are generally considered to be leaky or imperfect semipermeable membranes with membrane effects. Geotechnical engineering isolation barrier materials with semi-permeable membrane effect have the ability to block the passage of solutes. For charged ions, they mainly rely on the electrostatic repulsion of ions by the (superimposed) electric field formed by the diffusion double layer between adjacent clay particles; for non-polar Solutes, such as water-soluble organic mixtures, mainly restrict macromolecular solutes in geometric space through clay pore size. In recent years, chemical permeable membrane effects, diffusion coefficients,...

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