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Method and device for testing stress wave propagation law under axial approximate gradient static stress

A technology of stress wave and static stress, applied in the direction of measuring device, measuring ultrasonic/sonic wave/infrasonic wave, instrument, etc., can solve the problem of no method and test device

Active Publication Date: 2018-08-17
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still no feasible method and test device for how to apply axial gradient static stress to the specimen and test its stress wave propagation law.

Method used

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  • Method and device for testing stress wave propagation law under axial approximate gradient static stress
  • Method and device for testing stress wave propagation law under axial approximate gradient static stress
  • Method and device for testing stress wave propagation law under axial approximate gradient static stress

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Embodiment Construction

[0044] The invention includes an approximate gradient static stress loading device and a stress wave signal excitation and acquisition part;

[0045] Approximate gradient static stress loading device of the present invention:

[0046] (1) Select the size of loading beam 2 according to the required stress gradient and calculate the specification and quantity of weight 3; for the determined size of specimen 1 and combined with the stress gradient to be loaded, select the required size of loading beam 2, such as specimen 1 cross-sectional size: when the length×width is 30mm×30mm, it is advisable to choose No. 3 angle steel with a side width of 30mm to prepare the loading beam 2; When realizing linear gradient, that is, σ(x)=(G 1 (x)+G 2 (x)+G 3 (x)+G 4 (x)) / A, that is, σ(x)=Kx, K is called the stress gradient, the unit is MPa / m, x is the coordinate coincident with the axis of the test piece 1, and the upper edge of the first-stage loading beam 2 is The starting point, the un...

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Abstract

The invention relates to the technology of stress wave propagation law testing, and particularly relates to a method for testing the stress wave propagation law under axial approximate gradient static stress and a device thereof. The invention provides an approximate gradient static stress loading method, and the device for applying gradient static load to solid material is designed. According to the device, different sizes and forms of static stress gradient forms can be obtained, such as linear function type gradient static stress and quadratic function type gradient static stress so that testing of the stress wave propagation law under approximate gradient static stress can be realized by means of stress wave test equipment. Compared with methods and devices in the prior art, great enhancement is achieved in the aspects of simulation degree of practical project stress environment and the form of power disturbance so that more accurate theoretical guidance can be provided for project practice.

Description

technical field [0001] The invention relates to a method and a device for testing the law of stress wave propagation under axial approximate gradient static stress. Background technique [0002] In recent years, due to the frequent occurrence of earthquakes and natural disasters, the demolition of large-scale buildings (structures) by blasting, and the blasting and excavation of various rock and soil engineering, the stability of surrounding rocks has been required. Stress waves in various rock and soil or concrete media The propagation characteristics in has been one of the hot research areas. To study the propagation characteristics of stress waves in rock and soil, to detect the advanced stress of underground rock and soil working face, to analyze the stability of surrounding rock under dynamic load, to geophysics and resource exploration, to predict earthquakes and to improve blasting of rock and soil Effect and so on have important theoretical and practical value. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 金解放常军然袁伟程昀昌晓旭何聪陈伟
Owner JIANGXI UNIV OF SCI & TECH
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