Piezoelectric ring excitation device for testing granular material shear wave velocity and indoor testing device

Abstract

The invention disclose a piezoelectric ring excitation device for testing the granular material shear wave velocity and an indoor testing device. The piezoelectric ring excitation device comprises a piezoelectric ring (1), the inner side wall and the outer side wall of the piezoelectric ring (1) are both coated with epoxy resin (2), the interior of the piezoelectric ring (1) is filled with permeable stones (3), and the piezoelectric ring (1) is connected with data transmission cables (4) and a grounding wire (5). When the granular material shear wave velocity is tested, a pair of the piezoelectric ring excitation devices are installed on a base (6) and a top cap (7) respectively and serve as a shear wave excitation element and a receiving element, a sample (8) is arranged between the base (6) and the top cap (7), the base (6) is connected with a power amplifier (9) through one data transmission cable (4) and connected to a computer (10), and the top cap (7) is directly connected to the computer (10) through the other transmission cable (4). The piezoelectric ring excitation device adopts a radial deformation transmission shear wave, high precision is achieved, and a good testing means is provided for evaluating engineering characteristics of rock and soil materials.

Description

technical field [0001] The invention relates to an indoor test device capable of testing the shear wave velocity of granular rock and soil materials, which belongs to the indoor test device capable of conveniently and accurately evaluating the shear wave speed of rock and soil materials in the fields of geotechnical engineering and material engineering. Background technique [0002] Shear wave velocity of geotechnical materials (V s ) is one of the important parameters in engineering dynamic load design. Shear wave velocity is more and more widely used in geotechnical engineering, such as seismic dynamic response analysis, soil liquefaction evaluation and soil classification, etc. Shear wave velocity can also be used to evaluate the in-situ density, stress state, strength and large Deformation etc. At present, there are mainly two methods for testing shear wave velocity indoors: resonant column and bending element technology. Although the resonant column test technology c...

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Problems solved by technology

[0005] Technical problem: In order to solve the problem of large variability in test results in the above-mentioned bending element test technology, the present invention discloses a piezoelectric ring excitation device and an indoor test device for testing the shear wave velocity of granular materials. The principle of chopping waves, which solves the "near-field effect" and V s Inconsistent interpretation methods and other issues can be applied to other geotechnical engineering test equipment at the same time, with the advantages of simplicity and high precision

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