Experimental Study of Electromagnetic Emission During Rock Fracture

Xu, Weimin; Wushen, Tong; Peizhi, Wu

doi:10.1016/b978-0-08-036390-5.50011-7

Cited by 5 publications

(1 citation statement)

References 1 publication

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“…The deformation and failure of concrete is the process that the internal crack of the sample expands and penetrates and finally leads to instability. For the mechanism of charge separation and EMR generation in the process of concrete failure, predecessors have put forward various hypotheses, such as crack propagation effect, 32,33 piezoelectric effect, 34,35 friction effect, 36 and electromotive effect. 37 EMR is the electromagnetic wave emitted or leaked into the air by the interaction of electric field and magnetic field.…”

Section: Analysis On the Mechanism Of Concrete Magnetic Field Failurementioning

confidence: 99%

Experimental study on the change of magnetic field in the process of concrete failure under load

Yin

Song

et al. 2021

Struct Control Health Monit

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Many building structures in our life are mainly composed of concrete. Thus, monitoring of the failure of concrete structures is of great significance. We built an experimental system to monitor the magnetic field change upon concrete damage, based on which the magnetic field signal of the concrete failure process was tested. And then the relationships between magnetic induction intensity and load, acoustic emission (AE) were analyzed. The results show that the magnetic field can be produced in the process of concrete failure under load, and the change of magnetic induction intensity is consistent with the load. In the compaction stage, the magnetic induction intensity fluctuates and decreases. In the linear elastic stage, the magnetic induction intensity tends to increase steadily. In the plastic stage, the magnetic induction intensity has a tendency of increasing obviously. In the accelerated failure stage, the magnetic induction intensity increases rapidly. In the postpeak stage, the increase of magnetic induction intensity gradually decreases. There is a good correspondence between magnetic induction intensity and AE. When the magnetic induction intensity increases rapidly, the corresponding AE energy grows suddenly. The average coefficient of the correlation between the magnetic induction intensity and cumulative AE energy is above 0.9, showing a high correlation. This further proves that magnetic field can reflect the deformation and failure state of concrete. In conclusion, using magnetic field signal to evaluate the stability of concrete structure is expected to become a new nondestructive and noncontact monitoring method, which is convenient, fast, and continuous as well.

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Section: Analysis On the Mechanism Of Concrete Magnetic Field Failurementioning

confidence: 99%

Experimental study on the change of magnetic field in the process of concrete failure under load

Yin

Song

et al. 2021

Struct Control Health Monit

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Underground Measurements of Electromagnetic Radiation Related to Stress-induced Fractures in the Odenwald Mountains (Germany)

Lichtenberger

2006

Pure appl. geophys.

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The regional stress field at Wald-Michelbach (Odenwald Mountains, Germany) induces a secondary stress field around the space of the local railway tunnel. Resulting maximum shear stresses produce microfractures, which emit electromagnetic radiation (EMR). From EMR measured along the cross section and the long axis of the tunnel, the regional stress field is determined by a correlation of detected impulses per time with stresses calculated from the orientation of the tunnel, its diameter, and topographic load. The major horizontal principal stress has an azimuth of 103°. At times, strongly alternating EMR values are observed, which indicate electromagnetic disturbances of unknown origin. Such disturbances are identified by repeated measurements and are not evaluated. The repeated measurements, which are not disturbed, differ with median 112 impulses per 100 ms. This difference corresponds to 0.037 MPa and indicates a good reproducibility of the results. Regional stress magnitudes and the WNW-ESE orientation of the major horizontal principal stress indicate a minor N -S directed tensional force at the western shoulder of the Upper Rhine Graben.

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Observational results of electromagnetic radiation caused by explosion of small dimension rocks in field experiments

et al. 1997

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Experimental Study of Electromagnetic Emission During Rock Fracture

Cited by 5 publications

References 1 publication

Experimental study on the change of magnetic field in the process of concrete failure under load

Experimental study on the change of magnetic field in the process of concrete failure under load

Underground Measurements of Electromagnetic Radiation Related to Stress-induced Fractures in the Odenwald Mountains (Germany)

Observational results of electromagnetic radiation caused by explosion of small dimension rocks in field experiments

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