Method and device for measuring isotropic electrical properties in soil body compression process

Abstract

The invention discloses a device for determining isotropic electrical properties in a soil body compression process, a sample is arranged between an upper bearing plate and a lower bearing plate, an upper electrode plate and a lower electrode plate are respectively arranged at the top and the bottom of the sample, and an axial displacement sensor and a pressure sensor are arranged at the top of the upper bearing plate; radial electrode plate pairs are arranged at different height positions of the sample, and each radial electrode plate corresponds to one radial displacement meter. The invention further discloses a method for determining the isotropic electrical properties in each direction in the soil body compression process. The sectional area of the test sample at any time can be obtained, a result is corrected, the test accuracy is improved, and the result is more reliable. The internal structure change and the isotropic electrical properties of the soil body in the unconfined compression process can be analyzed more comprehensively through multi-path measurement. Resistivity and displacement changes are synchronous real-time data, so that the continuity of the test and the correlation of the data are improved.

Description

technical field [0001] The invention belongs to the field of rock and soil mechanics and engineering, and in particular relates to a method for measuring the anisotropic electric anisotropy in the process of soil compression, and also relates to a device for measuring the anisotropic electric anisotropy in the process of soil compression. Applicable but not limited to the study of strength properties, electrical properties and other engineering mechanical properties of various types of soil and medium soft rock. Background technique [0002] The resistivity of rock and soil is one of the basic physical and mechanical parameters of rock and soil, which characterizes the strength of the electrical conductivity of rock and soil. The existing research results show that the soil resistivity can reflect the soil mesostructure such as the moisture content, pore water conductivity and saturation of the sample to a certain extent. Because resistivity has the advantages of convenient...

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Problems solved by technology

However, the current test device has the following disadvantages: (1) there is no method and device for measuring the electrical anisotropy of the soil during the compression process; (2) the current unconfined compression instrument only measures the displacement in the direction of compression, and for soil compression The radial strain in the process and the change of the cross-sectional area of ​​the sample were not measured, but were corrected by the axial strain. The calculation result of the radial resistivity had a large error, and it was not convenient to compare the anisotropic electric anisotropy during the compression process of the soil; ( 3) At present, the position of the measuring point for measuring the radial resistivity is single, and the distance between the measuring points remains unchanged, and the positions of multiple measuring points cannot be freely selected; (4) The combination of the unconfined compression test and the resistivity test does not currently Perfect, the data has a low correlation in time, and the resistivity results cannot be corrected according to the real-time changes in the sample strain during the unconfined compression process

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