Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

Peyras, Laurent; Rivard, Patrice; Breul, Pierre; Millet, Adrien; Ballivy, G.

doi:10.1016/j.enggeo.2015.05.014

Cited by 15 publications

(5 citation statements)

References 19 publications

(18 reference statements)

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“…The detection of precursors of mine-subsidence-induced micro seismicity are of great interest to the research community: Acoustic emission techniques [144][145][146], infrared thermography [151], laser scanning [152] and the SAR (synthetic aperture radar) techniques [153][154][155][156][157][158] have been utilized to study the precursors of rock failure. SAR techniques, in particular, may have the most potential to assess the performance of partial extraction mines, because they can provide accurate, cumulative regional displacements of ground surface.…”

Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

“…For example, the expansion of discontinuous planes induced by dissolution results in the volume expansion of partings in pillars and may lead to a low-stress failure. Studies of fracture mechanics and damage mechanics must be coupled with field measurements using non-destructive testing (NDT) technologies, such as acoustic emission [144][145][146] and CT (Computed Tomography) scans [147,148], which can be used to investigate failure during continuous loading.…”

Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

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Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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Abstract:Partial extraction methods such as underground strip pillar mining or room-and-pillar mining are widely adopted techniques to control ground subsidence. However, pillar failure in partial extraction mines may introduce violent secondary ground collapses. The stability of partial extraction mines dictates the safety of ground surface structures and the environmental health state of the surrounding mining areas. To reuse mining subsidence lands, it is necessary to evaluate the stability of the land through mine subsidence assessments. This paper summarizes current pillar stability assessment methods and their limitations, and the rock mechanics associated with the stability of abandoned mines. The effects of multiple factors that affect mine stability are discussed in detail; special attention has been extended to discuss the weathering effects associated with infused water and spontaneous combustion, as these are some key reasons for pillar strength degradation in abandoned mines. The mechanism of mine collapse and the corresponding post-mining disasters are also summarized. Finally, suggestions and strategies to improve current mine stability assessment methods are proposed based on the perspective of subsidence control.

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Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

Section: Discussion Of Improving Stability Assessment Methodsmentioning

confidence: 99%

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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“…Compared with the mechanical method, the optical method is widely used to identify uneven surface due to its noncontact measurement which has some advantages such as high precision and nondestructive testing. In the aspects of assessment of joint roughness, some works [9][10][11][12][13][14] were conducted from the angle of fractal geometry. In these works, assessment and estimation of joint roughness are carried out based on the relationship between fractal dimension and surface topography of discontinuity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on 3D Roughness and Shear Failure Mechanism of Rock Mass Discontinuity

Wei

Men

Sun

et al. 2018

Advances in Civil Engineering

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A set of systematic experimental methods, including 3D accuracy scanning and identification of discontinuous surface topography, physical model construction, and laboratory direct shear experiment under different directions and normal stresses, was proposed to research the influence of discontinuity roughness on strength and deformation of discontinuity. During physical model construction of discontinuity, three types of discontinuity and rough natural rock joint surface models were constructed and moulded. Meanwhile, many influence factors of discontinuity surface topography, such as asperity inclination angle (AIA), asperity height (AH), normal stress (NS), and shear direction (SD), were considered during the direct shear experiment. On the basis of the experimental results, it can be found that there were two types of failure modes under different loading conditions, which were named “failure by shearing through the asperities” and “failure by sliding over the asperities”. The obvious stress concentration phenomenon, climbing, and cutting effects appeared in the process of the direct shear experiment. In addition, the accurate identification of surface topography of natural rough rock joint surface was carried out using three-dimensional sensing system (3DSS) and self-programming software before and after the experiment. The subsamples with the same surface topography as the original samples were moulded using a self-developed instrument. Then, the mechanical behavior of the original samples and subsamples for the natural rough rock joint surface under different shear directions and normal stresses was studied. The results show that the shear displacement under different shear directions and normal stresses is very large before it reaches the failure state. And the residual strength of the original samples is higher than that of the subsamples. In addition, failure modes of the subsamples are main failure by shearing through the asperities due to the significant difference between peak shear strength and residual strength. The failure modes for parts of the original samples are failure by sliding over the asperities. The change ratio of area for the discontinuity after the experiment depends on surface topography, strength of heave on the surface of discontinuity, and particle size of minerals on the surface of discontinuity.

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“…They determined that the higher the frequency of the transducer, the clearer the observed result of the internal structure [18]. Peyras et al used the amplitude of acoustic waves to determine and characterize the discontinuity openings of metamorphic rock mass [19]. In the process of loading, the internal strain of rock or coal samples will exhibit relaxation properties, and the ultrasonic velocity variation can be seen as an indicator of rock stress relaxation [20].…”

Section: Introductionmentioning

confidence: 99%

Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition

Liu

Wang

et al. 2017

Shock and Vibration

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Ultrasonic technology can be applied to study the changes in the internal defects of coal under quantitative loading, which can provide the theoretical basis for applying the technology to determine the structural stability of coal and predict disasters related to the dynamics of coal or rock. In this paper, to investigate the propagation laws of ultrasonic signals through a coal material under various loading conditions, an ultrasonic test system for the deformation and fracture of coal rock was used and a cyclic loading and unloading pattern is adopted. In addition, changes in ultrasonic parameters such as amplitude, dominant frequency, and velocity were analyzed. At the initial loading stage, the ultrasonic amplitude, amplitude of the dominant frequency, and wave velocity slightly decrease as the loading process progresses, and these three ultrasonic parameters gradually increase to their maxima when the stress level reaches approximately 46%. When it progresses from the linear elastic stage to the elastic plastic stage, the material inside the coal distorts and fractures more drastically, the inner defects are fully developed, and the acoustic parameters decrease significantly. Therefore, the corresponding measures should be adapted to reduce the loading stress before the coal is loaded to its critical stress level.

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Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

Cited by 15 publications

References 19 publications

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Experimental Study on 3D Roughness and Shear Failure Mechanism of Rock Mass Discontinuity

Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition

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