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Method for determining rock conjugate damage strength through adopting supersonic waves

An ultrasonic and rock technology, used in the analysis of solids, strength characteristics, instruments, etc. using sonic/ultrasonic/infrasonic waves, can solve the problems of rock interpretation errors, expensive, determination and judgment errors, etc., and achieves simple equipment and low test conditions. Effect

Inactive Publication Date: 2012-06-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acoustic emission monitoring of rock samples requires a complete set of acoustic emission monitoring equipment, which is relatively expensive, and the acoustic emission monitoring technology has high requirements for the loading test machine, which requires stable loading, and the loading is caused by the vibration of the equipment itself (such as the high-pressure cylinder piston. Reciprocating) and noise need to be strictly controlled, otherwise it is difficult to distinguish the background noise signal and the real acoustic emission signal generated by the rock sample loaded, so there are certain errors in the determination and judgment of these two indicators, and the rock The interpretation error of conjugate damage intensity is particularly significant

Method used

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  • Method for determining rock conjugate damage strength through adopting supersonic waves
  • Method for determining rock conjugate damage strength through adopting supersonic waves
  • Method for determining rock conjugate damage strength through adopting supersonic waves

Examples

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Effect test

Embodiment 1

[0037] A method for determining the conjugate damage strength of rock by ultrasonic waves, comprising the following steps:

[0038] Step 1: Fix a pair of longitudinal wave probes at both ends of two mutually perpendicular diameters on a certain cross-section in the middle of the rock sample, that is, the first longitudinal wave transmitting probe, the first longitudinal wave receiving probe, the second longitudinal wave transmitting probe and the second longitudinal wave receiving probe. probe;

[0039]Step 2: Carry out pressure loading on the rock sample, and during the loading process, continuously test the rock acoustic wave velocity between the two mutually perpendicular diameters of the rock sample at a time interval T through the fixed longitudinal wave probe in step 1, until the rock sample is destroyed; Here, T takes 1 to 3s, and the specific operation steps of step 2 are as follows:

[0040] Step 2.1, start the test button of the acoustic wave tester at a certain tim...

Embodiment 2

[0046] A method for determining the conjugate damage strength of rock by ultrasonic waves, comprising the following steps:

[0047] Step 1, fixing a pair of longitudinal wave probes at both ends of a diameter on a certain longitudinal section in the middle of the rock sample, i.e. the first shear wave transmitting probe and the first shear wave receiving probe;

[0048] Step 2. Pressure loading is carried out on the rock sample, and during the loading process, the diameter of the rock sample and the rock acoustic wave velocity are continuously measured at time intervals T through the shear wave probe fixed in step 1 until the rock sample is destroyed; here, T takes 1~ 3s, the specific operation steps are as follows:

[0049] Step 2.1, start the test button of the acoustic wave tester at a certain time t1, the first longitudinal wave transmitting probe emits ultrasonic waves, and after time Δt1 reaches the first longitudinal wave receiving probe, divide the diameter d of the ro...

Embodiment 3

[0053] A method for determining the conjugate damage strength of rock by ultrasonic waves, comprising the following steps:

[0054] Step 1: Fix a pair of longitudinal wave probes at both ends of two mutually perpendicular diameters on a certain cross-section in the middle of the rock sample, that is, the first longitudinal wave transmitting probe, the first longitudinal wave receiving probe, the second longitudinal wave transmitting probe and the second longitudinal wave receiving probe. Probes; a pair of longitudinal wave probes are fixed at both ends of a diameter on a certain longitudinal section in the middle of the rock sample, that is, the first shear wave transmitting probe and the first shear wave receiving probe;

[0055] Step 2: Pressure loading is carried out on the rock sample, and during the loading process, the longitudinal wave probe and the shear wave probe fixed in step 1 are used to continuously test the distance between two mutually perpendicular diameters an...

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Abstract

The invention relates to a method for determining the rock conjugate damage strength through adopting supersonic waves. The method concretely comprises the following operations: 1, respectively arranging a pair of longitudinal wave probes on two ends of two mutually perpendicular diameters on a cross section in the middle of a rock sample, and respectively continuously testing rock sound wave speeds between the two mutually perpendicular diameters of the rock sample in a short time (such as 1-3s) interval in the rock sample loading process until the rock sample is destroyed; and 2, finishing the changing process of two mutually perpendicular radial sound wave longitudinal wave speeds with the axial stress of the rock sample after the test completion, and obtaining the rock conjugate damage strength which is the axial stress corresponding with the substantially reduced radial longitudinal wave speed. The rock sample longitudinal wave speed test of the two mutually perpendicular diameters is carried out to eliminate the error caused by axial crack orientation generated during the axial loading of the rock sample and improve the determination precision.

Description

technical field [0001] The invention relates to a method for judging the conjugate damage strength of rock, in particular to a method for judging the conjugate damage strength of rock by ultrasonic waves. Background technique [0002] With the further deepening of hydropower development and the further increase of the mining depth of mineral resources, the stress-type failure of surrounding rocks in tunnels or mining roadways caused by deep high stress is becoming more and more common and serious, which often induces major engineering geological disasters. In order to evaluate the size of the rock mass excavation damage area in underground engineering of deep buried hard rock and medium hard rock (such as basalt, granite, marble, etc.) and control the dynamic excavation response of surrounding rock (such as rock burst, flaking failure, etc.) , it is necessary to understand the fracture characteristics of hard rock under high stress. After more than 40 years of hard work, es...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N29/07
Inventor 严鹏卢文波陈明周创兵姜清辉
Owner WUHAN UNIV
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