Analysis of the Displacement Field of Soft Rock Samples During UCS Tests by Means of a Computer Vision Technique

Fazio, Nunzio Luciano; Leo, Marco; Perrotti, Michele; Lollino, Piernicola

doi:10.1007/s00603-019-01791-y

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…Nunzio, Luciano, Fazio et. al studied the displacement eld evolution of limestone samples in uniaxial compression tests by using the computer vision technology of non-contact digital image deformation detection, which proved that this technology can detect the displacement evolution before and after failure with high accuracy ( Fazio et. al.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

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The slippage initiation and induced instability of roadway surrounding rock are highly likely to cause dynamic disasters, severely influencing the safety production of mining. With the optical-mechanical monitoring test of the deformation localization of energy dissipation, this study established the optical index of coal deformation equilibrium degree under load, and obtained the evolution law of coal deformation equilibrium degree. After analyzing the relationship between tensile-sliding effect and mechanical behavior of coal deformation field, it proposed the strain energy ratio coefficient. The results indicate that the strength reduction of coal body is affected by the deformation accumulation of loading displacement field. The sliding displacement of the stable sliding type specimen occurs 5.5s earlier than tensile displacement，which is 4.4s longer than the instantaneous instability type specimen. The instability type of coal is closely related to the tangent angle of the strain energy ratio coefficient and the damage persistence characteristics. The damage accumulation of stable equal amplitude contributes to the stable failure, and the damage accumulation of interval equal amplitude influences the instantaneous instability development. The fracture expansion stage is the main stage of energy consumption damage accumulation. That is, the main energy consumption damage accumulation stage of the stable slip coal is the stable crack expansion stage, with the damage proportion of 35.89%, while the damage proportion of instantaneous instability coal in the unsteady crack expansion stage is 84.226%. The study provides theoretical reference for the fracture law and risk monitoring of coal slippage.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

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“…The physical and mechanical properties of weakly cemented strata are the most basic factors affecting the stability of rock surrounding a roadway [5,6]. Due to the different mineral compositions and structures of rock masses, the physical and mechanical properties of different rocks are very different [7]. Especially for expansive soft rock roadways [8], a high expansion stress will be generated during the water absorption process of hydrophilic minerals, which is unfavorable for the stability of roadway-adjacent rock.…”

Section: Introductionmentioning

confidence: 99%

Study of the Failure Mechanism of Soft Rock Mining Roadways Based on Limit Analysis Theory

Zhang,

Gao,

Yang

et al. 2023

Applied Sciences

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To study the deformation and failure mechanisms of soft rock mining roadways, the 1506 return airway of Anyang Coal Mine is taken as the engineering background. Based on limit analysis theory, a failure model based on a rigid slider system is constructed to assess the failure of the soft rock surrounding a roadway. The formulas for calculating the self-weight power of the slider in the velocity discontinuity line of the rock surrounding the roadway, the work power of the surrounding rock pressure, and the energy dissipation rate of the velocity discontinuity line are derived, and the upper limit objective function of the velocity discontinuity line height is obtained. The failure characteristics and fracture evolution process of the surrounding rock under different mining stresses are analyzed by means of physical similarity simulations. The simulation results show that shear failure occurs first on the roadway side due to stress concentration. The fissures expand along the bottom angle of the roadway to the blind support area and the low-intensity support area. The cracks weaken the support strength of the angled anchor cable and bolt in the roadway shoulder. Under the action of roof pressure, the status of the rock mass inside and outside the shear slip zone changes from static to dynamic. This causes deformation and failure of the roadway roof, side, and floor.

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“…Video motion magnification techniques have opened up a wealth of important applications. Examples include detecting a heartbeat vibration from tiny head motions [ 1 ] or blood flow [ 2 ], magnifying muscle tremors [ 3 , 4 ] to give an accurate clinical judgement, reconstructing speech information from small visual variations [ 5 ], evaluating material properties by the way it moves [ 6 ], estimating damage information of a building structure by measuring small vibrations in video [ 7 , 8 , 9 ], and lip reading [ 10 ]. However, some essential properties of dynamic objects become evident only when they move.…”

Section: Introductionmentioning

confidence: 99%

Bayesian-Inference Embedded Spline-Kerneled Chirplet Transform for Spectrum-Aware Motion Magnification

Cai

Lin

et al. 2022

Sensors

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The ability to discern subtle image changes over time is useful in applications such as product quality control, civil engineering structure evaluation, medical video analysis, music entertainment, and so on. However, tiny yet useful variations are often combined with large motions, which severely distorts current video amplification methods bounded by external constraints. This paper presents a novel use of spectra to make motion magnification robust to large movements. By exploiting spectra, artificial limitations and the magnification of small motions are avoided at similar frequency levels while ignoring large ones at distinct spectral pixels. To achieve this, this paper constructs spline-kerneled chirplet transform (SCT) into an empirical Bayesian paradigm that applies to the entire time series, giving powerful spectral resolution and robust performance to noise in nonstationary nonlinear signal analysis. The important advance reported is Bayesian-rule embedded SCT (BE-SCT); two numerical experiments show its superiority over current approaches. For applying to spectrum-aware motion magnification, an elaborate analytical framework is established that captures global motion, and use of the proposed BE-SCT for dynamic filtering enables a frequency-based motion isolation. Our approach is demonstrated on real-world and synthetic videos. This approach shows superior qualitative and quantitative results with less visual artifacts and more local details over the state-of-the-art methods.

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Analysis of the Displacement Field of Soft Rock Samples During UCS Tests by Means of a Computer Vision Technique

Cited by 7 publications

References 29 publications

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Study of the Failure Mechanism of Soft Rock Mining Roadways Based on Limit Analysis Theory

Bayesian-Inference Embedded Spline-Kerneled Chirplet Transform for Spectrum-Aware Motion Magnification

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