CN103995054A - Acoustic emission testing based method for analyzing structural damage inside water-containing coal rock - Google Patents
Acoustic emission testing based method for analyzing structural damage inside water-containing coal rock Download PDFInfo
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Abstract
The invention discloses an acoustic emission testing based method for analyzing structural damage inside water-containing coal rock. The method comprises the following steps: loading a water-containing coal sample, enabling an acoustic emission sensor to receive an acoustic emission signal generated from structural damage inside the coal sample, wherein an emission curve reflects the evolutionary process of micro crack inside the coal sample, defining the coal rock loaded damage through coal sample acoustic emission ringing count, and establishing a sectional damage evolution model which takes time as variables with the combination of damage theory and acoustic emission theory. The invention aims at revealing the acoustic emission characteristics of the water-containing coal rock loaded damage, data basis is provided for the stability of a well waterproof coal column, and beneficial reference is also provided for relevant construction engineering.
Description
Technical field
The present invention relates to a kind of method of moisture coal petrography inner structure breakdown diagnosis, particularly a kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis.
Background technology
The effect of water and coal petrography is one of the focus of current Engineering Rock Mechanics research and difficult point.Under water body, under water-bearing zone, on confined aquifer or when the digging of water guide near Faults, for prevent surface water or underground water stain enter work place, coal (rock) layer that need to reserve certain width or height is not adopted, as waterproof coal (rock) post.The intensity of coal column intensity and coal petrography test block be while carrying out Coal Pillar Design basis and crucial.Therefore, probe into coal petrography weakening strength rule under water effect and can provide basic reference for the research of water proof stability of coal pillar.Acoustic emission can detect generation and the expansion of brittle body internal tiny crack continuously, in real time, and by analysis and research to coal petrography AE signal, the condition of deducibility coal petrography inside changes, the failure mechanism of inverting coal petrography.In at present domestic and international achievement in research, lack the research of the characteristics of Acoustic Emission of moisture coal petrography mechanical failure.Therefore study the characteristics of Acoustic Emission that moisture coal and rock is subject to load damage, and probe into the relation of acoustic emission parameters and coal and rock mechanical failure mechanism, can be better basic data is provided and provides useful reference for correlation engineering construction for the stability of down-hole water proof coal column.The present invention is directed to this situation, propose the acoustic emission detection method of moisture coal and rock inner structure damage, and to acoustic emission signal data extraction and analysis.
Summary of the invention
The invention provides a kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis, be subject to the characteristics of Acoustic Emission of load damage to have disclosed moisture coal petrography, can provide data basis to the stability of down-hole water proof coal column, also can be correlation engineering construction useful reference is provided.
A kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis that the present invention proposes, is specifically realized by following steps:
Step 1, prepare the coal sample of different water cut, and coal sample surface is dried.
Step 2, calibrate AE sensor is attached in the moisture coal sample preparing, and utilizes butter to make couplant, make contact good.
Step 3, to moisture coal sample imposed load, make calibrate AE sensor receive respectively different water cut coal sample because of internal injury produce acoustic emission signal.
Step 4, the acoustic emission signal of the moisture coal sample receiving in step 3 is carried out to characteristic parameter extraction, obtain the characteristic parameters such as the energy, Ring-down count, duration, amplitude of each signal.
The Ring-down count extracting in step 5, optional step four and accumulative total Ring-down count are described the damage feature of moisture coal petrography, normalization obtains Damage Parameter, draw " Damage Parameter-time " curve map of moisture coal sample damage evolutionary process, according to moisture coal sample damage evolution curve definitions New Subsection Curve Damage Model.Carry out numerical fitting in conjunction with test findings and obtain moisture coal sample damage model parameter list and coal petrography damage Constitutive Equation.
Meaning of the present invention is the characteristics of Acoustic Emission parameter that the coal and rock by utilizing acoustic emission detection different water cut produces because of bearing load internal injury, and characteristic parameter is analyzed, probe into the relation of acoustic emission parameters and moisture coal and rock mechanical failure mechanism, and analyze the failure mechanism of the moisture coal and rock of waterproof coal (rock) post equivalent-load in conjunction with other geology of moisture coal and rock, mechanics parameter.Stable maintenance to down-hole water proof coal column has important references meaning, and provides useful reference for correlation engineering construction.
Brief description of the drawings
Fig. 1 is the process flow diagram of a kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis of the present invention.
Fig. 2 is the pilot system schematic diagram of a kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis of the present invention.
Fig. 3 is moisture coal sample Ring-down count rate temporal evolution graph of a relation.
Fig. 4 is moisture coal sample energy rate temporal evolution graph of a relation.
Fig. 5 is " Damage Parameter-time " curve map of moisture coal sample damage evolutionary process.
Wherein, 1 is moisture coal sample; 2 is coal sample loading and control system; 3 is the calibrate AE sensor of placing while detecting moisture coal sample internal injury acoustic emission signal; 4 is prime amplifier; 5 is Acoustic emission signal processing system.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis provided by the invention is elaborated.
A kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis provided by the invention, flow process as shown in Figure 1, specifically realizes as follows:
Step 1, prepare the coal sample of different water cut, and coal sample surface is dried.
Step 2, calibrate AE sensor is attached to 3 places, position shown in Fig. 2, and makees couplant with butter, make contact good.
Step 3, the moisture coal sample that posts calibrate AE sensor is placed in the loading shown in Fig. 2 and control system 2, and to moisture coal sample imposed load, make calibrate AE sensor receive the acoustic emission signal that coal sample internal injury produces, and signal is passed through to prime amplifier 4, in input Acoustic emission signal processing system 5, process.
Step 4, the acoustic emission signal of the moisture coal sample receiving in step 3 is carried out to characteristic parameter extraction, obtain the characteristic parameter of each signal.As Fig. 3-4, wherein, Fig. 3 is moisture coal sample Ring-down count rate temporal evolution graph of a relation, and Fig. 4 is moisture coal sample energy rate temporal evolution graph of a relation.
The Ring-down count Ω extracting in step 5, optional step four and accumulative total Ring-down count Ω
mdamage feature to moisture coal petrography is described, normalization obtains damaging parameter D (suc as formula 1), draw " Damage Parameter-time " curve map (as Fig. 5) of moisture coal sample damage evolutionary process, according to moisture coal sample damage evolution curve definitions New Subsection Curve Damage Model (suc as formula 2).Carry out numerical fitting in conjunction with test findings and obtain moisture coal sample damage model parameter list (as table 1) and coal petrography damage Constitutive Equation (suc as formula 3)
In formula: a, c, b, d are material parameter, wherein a+c=1; E
0elastic modulus during for coal petrography not damaged.
The moisture coal sample damage model of table 1 parameter list
Claims (2)
1. the method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis is characterized in that:
A. prepare the coal sample of different water cut, and coal sample surface is dried.
B. calibrate AE sensor is attached in the moisture coal sample preparing, and utilizes butter to make couplant, make contact good;
C. to moisture coal sample imposed load, make calibrate AE sensor receive respectively the acoustic emission signal that different water cut coal sample produces because of internal injury;
D. the acoustic emission signal of the moisture coal sample receiving in step 3 is carried out to characteristic parameter extraction, obtain the characteristic parameters such as the energy, Ring-down count, duration, amplitude of each signal.
E. the Ring-down count extracting in optional step four and accumulative total Ring-down count are described the damage feature of moisture coal petrography, normalization obtains Damage Parameter, draw " Damage Parameter-time " curve map of moisture coal sample damage evolutionary process, according to moisture coal sample damage evolution curve definitions New Subsection Curve Damage Model.Carry out numerical fitting in conjunction with test findings and obtain moisture coal sample damage model parameter list and coal petrography damage Constitutive Equation.
2. a kind of method based on the moisture coal petrography inner structure of acoustic emission detection breakdown diagnosis according to claim 1, is characterized in that: described coal sample is standard specimen, diameter 50mm, height 100mm.
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| CN104965027A (en) * | 2015-07-13 | 2015-10-07 | 中国矿业大学 | Analytical method for anchoring rock fracture extension based on image recognition and acoustic emission location |
| CN107345875A (en) * | 2017-07-14 | 2017-11-14 | 西安建筑科技大学 | The rigidity appraisal procedure of Reinforced Concrete Members with Flexure based on sound emission Ring-down count |
| CN108168996A (en) * | 2017-12-13 | 2018-06-15 | 西安交通大学 | A kind of PBX damage development CT in-situ study methods based on acoustic emission signal |
| CN109356655A (en) * | 2018-12-06 | 2019-02-19 | 西安科技大学 | The compound coal rock dynamic disaster prediction and warning method of index is extracted based on gas density and sound emission |
| CN110646276A (en) * | 2019-10-31 | 2020-01-03 | 西安科技大学 | Characteristic time-frequency damage evolution analysis method for coal rock mass with different apertures under uniaxial loading |
| CN110687209A (en) * | 2019-10-21 | 2020-01-14 | 西安建筑科技大学 | Recycled concrete damage evolution method based on acoustic emission accumulated event number |
| CN110702517A (en) * | 2019-10-21 | 2020-01-17 | 西安建筑科技大学 | Concrete damage analysis method based on stage cumulant proportion of acoustic emission parameters |
| CN113030278A (en) * | 2021-03-09 | 2021-06-25 | 北京科技大学 | Corrosion concrete fracture analysis method based on acoustic emission technology |
| CN113155200A (en) * | 2021-05-16 | 2021-07-23 | 天地科技股份有限公司 | Coal mine underground reservoir coal pillar dam body damage and damage determination device and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104965027A (en) * | 2015-07-13 | 2015-10-07 | 中国矿业大学 | Analytical method for anchoring rock fracture extension based on image recognition and acoustic emission location |
| CN104965027B (en) * | 2015-07-13 | 2018-09-21 | 中国矿业大学 | The analysis method extended based on image recognition and sound emission positioning and anchoring rock cranny |
| CN107345875A (en) * | 2017-07-14 | 2017-11-14 | 西安建筑科技大学 | The rigidity appraisal procedure of Reinforced Concrete Members with Flexure based on sound emission Ring-down count |
| CN107345875B (en) * | 2017-07-14 | 2019-08-06 | 西安建筑科技大学 | The rigidity appraisal procedure of Reinforced Concrete Members with Flexure based on sound emission Ring-down count |
| CN108168996A (en) * | 2017-12-13 | 2018-06-15 | 西安交通大学 | A kind of PBX damage development CT in-situ study methods based on acoustic emission signal |
| CN109356655A (en) * | 2018-12-06 | 2019-02-19 | 西安科技大学 | The compound coal rock dynamic disaster prediction and warning method of index is extracted based on gas density and sound emission |
| CN110687209A (en) * | 2019-10-21 | 2020-01-14 | 西安建筑科技大学 | Recycled concrete damage evolution method based on acoustic emission accumulated event number |
| CN110702517A (en) * | 2019-10-21 | 2020-01-17 | 西安建筑科技大学 | Concrete damage analysis method based on stage cumulant proportion of acoustic emission parameters |
| CN110646276A (en) * | 2019-10-31 | 2020-01-03 | 西安科技大学 | Characteristic time-frequency damage evolution analysis method for coal rock mass with different apertures under uniaxial loading |
| CN113030278A (en) * | 2021-03-09 | 2021-06-25 | 北京科技大学 | Corrosion concrete fracture analysis method based on acoustic emission technology |
| CN113155200A (en) * | 2021-05-16 | 2021-07-23 | 天地科技股份有限公司 | Coal mine underground reservoir coal pillar dam body damage and damage determination device and method |
| CN113155200B (en) * | 2021-05-16 | 2022-09-23 | 天地科技股份有限公司 | Coal mine underground reservoir coal pillar dam body damage and damage determination device and method |
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Application publication date: 20140820 |