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Method for continuously measuring acoustic wave velocity in rock compressed crack propagation measurement process

A technology of sonic wave velocity and crack propagation, which is used in the measurement of ultrasonic/sonic/infrasonic waves, measurement of propagation velocity, measurement devices, etc.

Inactive Publication Date: 2012-07-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing static wave velocity test method cannot meet this measurement requirement, and it is necessary to invent a dynamic continuous sound wave test method to realize this function

Method used

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  • Method for continuously measuring acoustic wave velocity in rock compressed crack propagation measurement process
  • Method for continuously measuring acoustic wave velocity in rock compressed crack propagation measurement process
  • Method for continuously measuring acoustic wave velocity in rock compressed crack propagation measurement process

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Embodiment Construction

[0037] A continuous measurement method for measuring the acoustic wave velocity in the rock compression crack propagation process provided by the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0038]First, make rock samples, and the sample size is in accordance with the ratio of uniaxial compression test regulations. The sample is required to be ground flat, and the flatness meets the requirements of the uniaxial compression test. Rock samples are brittle materials, and under uniaxial compression conditions, cracks, mainly tension cracks, are produced along the axial direction. In addition to rock materials, it also includes common brittle materials such as concrete, glass, ice and other brittle materials. The shape of the rock sample can be a cylinder, a cuboid and a rock sample with prefabricated cracks as shown in 4A, 4B, and 4C. The prefabricated cracks can be open cracks, closed cracks and groove cr...

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Abstract

The invention provides a method for continuously measuring an acoustic wave velocity in a rock compressed crack propagation measurement process. An acoustic wave transmission probe and an acoustic wave receiving probe are fixed on the lateral side of loading a sample, and the time that the acoustic wave propagates along a direction vertical to the loading direction in a rock sample is continuously recorded by adopting a data continuous automatic recording system, so that the radial acoustic wave velocity of the rock sample in the whole uniaxial compression loaded crack propagation process is continuously measured. The acoustic wave velocity in the main direction of vertical crack development in the crack propagation process is continuously measured, so that technical support is provided to the acoustic elasticity research and application in the whole process of generating, propagating and penetrating the crack in the rock sample loading process.

Description

technical field [0001] The invention relates to the wave velocity test in the loading process in the rock mechanics experiment, and is particularly suitable for analyzing the change of wave velocity caused by crack expansion in the rock compression process, especially suitable for the research on the wave velocity change caused by crack expansion in the compression process of prefabricated cracked rock samples. technical background [0002] Under the action of vibration, except near the source, there will be a corresponding instantaneous micro-strain in the material, which can be assumed to be elastic. Starting from this assumption, the propagation speed of the vibration wave in the material is determined by the elastic parameters and density of the material. According to the theory of elasticity, the relationship between wave velocity and elastic parameters in a material is: [0003] v p = E ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H5/00
Inventor 张晓平张仕平
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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