Test device for researching propagation characteristic of elastic p-wave in joint rock mass

A test device and technology of jointed rock mass, which is applied in the direction of analyzing solids with sound waves/ultrasonic waves/infrasonic waves, measuring devices, and material analysis using sound waves/ultrasonic waves/infrasonic waves. Simple operation and the effect of meeting the test requirements

Inactive Publication Date: 2019-01-29
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing studies on the propagation characteristics of stress waves in rock mass mainly focus on numerical studies, and there are few experimental studies.

Method used

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  • Test device for researching propagation characteristic of elastic p-wave in joint rock mass
  • Test device for researching propagation characteristic of elastic p-wave in joint rock mass
  • Test device for researching propagation characteristic of elastic p-wave in joint rock mass

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Experimental program
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Embodiment Construction

[0014] figure 1 The experimental device used to study the propagation characteristics of elastic longitudinal waves at joints is shown. This device can be used to measure the propagation characteristics of elastic longitudinal waves at joints with different initial wave velocities and initial waveforms.

[0015] The technical scheme adopted in the present invention is a test device for studying the propagation characteristics of elastic longitudinal waves in jointed rock mass. The test device includes three parts: a launching system, a loading system and a measuring system. Launching system 3 is used to launch bullets and provide an initial waveform for the stone rod. The loading device is mainly used to place the stone rod, and the measuring device is used to measure the strain in the middle of the stone rod.

[0016] The launch system 3 includes a base 1 , a bullet 5 , a launch chamber 6 , an infrared velocimeter and a driving coil 7 . The launch chamber 6 is connected to ...

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Abstract

The invention discloses a test device for researching the propagation characteristic of elastic p-wave in a joint rock mass. The test device comprises a shooting system, a loading system, and a measuring system. A pipeline of a shooting cavity is made from a high-strength insulating material. Bullets are composed of an armature and a metallic bullet body. A power system uses magnetic waves generated by alternating current to drive the bullets. The initial speed of the bullets can be changed by changing a discharge voltage, so that the propagation characteristic of the elastic p-wave with different initial wave speeds in the joint rock mass can be obtained, and the propagation characteristic of the elastic p-wave with different initial waveforms can be obtained by adjusting the shape of thebullets. The measuring system uses a strain gage to measure the local displacement of the rock, so as to obtain a wave speed change. The measurement system also adopts a digital image processing technique. The two measured data are compared to ensure the accuracy of the test.

Description

technical field [0001] The invention relates to a test device and method for studying the propagation characteristics of elastic longitudinal waves in jointed rock mass, and belongs to the technical field of rock mechanics analysis tests. Background technique [0002] Natural rock masses generally have defects such as joints, faults, and weak interlayers. In actual engineering, jointed rock masses often have the characteristics of heterogeneity, anisotropy, and nonlinearity. With the continuous development of economic construction, the scale of underground geotechnical engineering is getting larger and larger, and the problems involved in rock mechanics are becoming more and more complex, which puts forward higher requirements for the research of rock mechanics. Underground geotechnical engineering will inevitably encounter underground engineering problems such as blasting construction, mining, earthquakes, landslides, and rockbursts during construction and use. These under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/07G01N29/22
CPCG01N29/04G01N29/07G01N29/22G01N2291/0232G01N2291/0421
Inventor 范立峰徐超王丽娟
Owner BEIJING UNIV OF TECH
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