Method and device for testing small strain viscoelastic parameters of geotechnical engineering materials by bending element

A technology of geotechnical engineering and elastic parameters, applied in the analysis of materials, the analysis of solids using sonic/ultrasonic/infrasonic waves, instruments, etc., can solve the problems of lack of a unified, simple and reliable method, unclear boundary conditions of the self-vibrating column test, etc. Achieve the effect of saving test time, eliminating uncontrollable effects, and eliminating test steps

Active Publication Date: 2019-05-07
ZHEJIANG UNIV
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Problems solved by technology

However, the self-oscillating column test still has the disadvantage of unclear boundary conditions, and the test results need to be corrected
In summary, there is still a lack of a unified, simple and reliable method for testing the viscoelastic parameters of geotechnical engineering materials under small strain conditions.

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  • Method and device for testing small strain viscoelastic parameters of geotechnical engineering materials by bending element
  • Method and device for testing small strain viscoelastic parameters of geotechnical engineering materials by bending element
  • Method and device for testing small strain viscoelastic parameters of geotechnical engineering materials by bending element

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Embodiment Construction

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] The method is based on a bending element testing device, and the viscoelastic index of the test material is obtained by analyzing the body wave velocity and body wave attenuation.

[0047] The test device of this method includes a receiving bending unit 2, an exciting bending unit 3, a foam rod 5, a signal generator 6, a power amplifier 7, a charge amplifier 8 and an oscilloscope 9. The test needs to prepare a cylindrical sample with a relatively large length and diameter, and use Place as little contact area as possible on the foam rod 5, and the fulcrum position is 0.2L indented at both ends of the sample. During the test, the bending element at one end of the sample excites a pulse signal, which includes compression wave and shear wave components, which are recorded by the receiving bending element at the other end after pro...

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Abstract

The invention discloses a method and device for testing the small strain viscoelasticity parameter of a geotechnical engineering material through bending elements. The process comprises the steps of firstly, preparing a column type sample, and conducting measurement to obtain the density of the sample; placing the column type sample on a foaming rod, connecting the excitation bending element and the receiving bending element to the two ends of the column type sample respectively, and inserting piezoelectric ceramics of the two bending elements into the same depth in the column type sample; exciting a pulse signal through the excitation bending element, wherein the signal is transmitted and reflected by the column type sample and recorded and received by the receiving bending element, and processing a transmitted excitation signal and a received signal, so that the viscoelasticity parameters containing the elastic parameter and the damping ratio are obtained. Compared with an existing material viscoelasticity parameter test method, the method and device can be used for testing the strain viscoelasticity parameter and have the advantages that the test device is simple, test efficiency is high, and the physical relation is definite.

Description

technical field [0001] The invention relates to a material parameter testing method and device, in particular to a method and device for testing small-strain viscoelastic parameters of geotechnical engineering materials by means of a bending element. The small-strain viscoelastic parameters are obtained through rock-technical material fluctuation testing and analysis. Background technique [0002] When performing foundation dynamic analysis or dynamic model test, the dynamic stress-strain relationship of geotechnical engineering materials is often simplified to an ideal viscoelastic model, and its mechanical properties are characterized by elastic modulus and damping ratio; the accuracy of material viscoelastic parameter testing It will directly affect the reliability of dynamic analysis or test. For uniform, continuous and rigid materials (such as complete rocks), the viscoelastic parameters can be tested using the cantilever beam vibration method. The boundary conditions o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07
CPCG01N29/07G01N2291/02827
Inventor 周燕国陈捷孟迪孙政波刘弈辰黄根清
Owner ZHEJIANG UNIV
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