Device for testing performance of cohesive soil sample and testing method thereof

Abstract

The invention discloses a device for testing the performance of a cohesive soil sample. The device comprises a sample box, an upper permeable stone, a lower permeable stone, upper filter paper, lower filter paper, a micro differential pressure sensor, a data acquisition instrument, a precision injection pump, a first liquid storage tank, a second liquid storage tank, a third liquid storage tank and a fourth liquid storage tank, wherein an upper left way pipe, an upper middle way pipe and an upper right way pipe are provide in a top cover, a lower left way pipe, a lower middle way pipe and a lower right way pipe are provide in a pedestal, the micro differential pressure sensor is connected with the data acquisition instrument, and four injectors are arranged in the precision injection pump. The testing device can carry out determination of the coefficient of membrane efficiency, the coefficient of effective diffusion and the performance of retardation factors on the cohesive soil sample. Meanwhile, the invention also provides a testing method used by the device for testing the performance of the cohesive soil sample, and the method is simple and practicable and can realize combined determination of the coefficient of membrane efficiency, the coefficient of effective diffusion and the performance of retardation factors of the cohesive soil sample instead of respective determination, thereby improving determination efficiency.

Description

technical field [0001] The invention relates to the field of environment and geotechnical engineering, in particular, to a performance testing device and a testing method of a cohesive soil sample, especially for vertical tests of bentonite and clay / sandy soil types under the action of a metal ion solution. Determination of Membrane Efficiency Coefficient, Effective Diffusion Coefficient and Retardation Factor Properties of Engineering Barrier Materials such as Separation Wall, Clay and Compacted Clay (CCL), Geosynthetic Clay Liner (GCL). Background technique [0002] According to the traditional convection-diffusion-diffusion migration theory, for example, SHACKELFORD C D. and DANIEL D E. published "Diffusion in saturated soil.I:Background", the effective diffusion coefficient and blocking factor are used to evaluate the heavy metal blocking of engineering barriers such as cohesive soil, compacted clay liner (CCL), geosynthetic clay liner (GCL), bentonite vertical separatio...

AI Technical Summary

Problems solved by technology

At present, there is no test device capable of measuring the membrane efficiency coefficient of geotechnical engineering materials, which limits the accuracy of obtaining transport parameters of heavy metal pollutants in engineering practice and the progress of theoretical analysis methods for scientific research.

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