Acoustic emission response and evolution of precracked coal in the meta-instability stage under graded loading
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TL;DR: In this article , the authors investigate the count and energy characteristics of acoustic emission (AE) and 15 numerical models are carried out with PFC to analyze the distributional characteristics of the stress, displacement, fracture and force chain fields.
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About: This article is published in Engineering Geology. The article was published on 01 Nov 2022. and is currently open access. The article focuses on the topics: Instability & Acoustic emission.
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Citations
Fracture response and damage evolution features of coal considering the effect of creep damage under dynamic loading
TL;DR: In this paper , the mesoscopic mechanism, damage degree, force chain fabric and energy evolution of coal were analyzed under different creep and impact stress, and the results showed that coal mesoscopic particles move inward along the axial direction and outward along the minimum principal stress.
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Evaluation of energy accumulation, strain burst potential and stability of rock mass during underground extraction of a highly stressed coal seam under massive strata-a field study
Arka Jyoti Das,Prabhat Kumar Mandal,N. Ghosh,Awanindra Pratap Singh,Ranjan Kumar,S. Tewari,Rana Bhattacharjee +6 more
TL;DR: In this paper , different underground structures and adequate support systems under such complex geological conditions are designed by evaluating energy accumulation, strain burst potential, stress conditions and stability of the rock mass, and an energy-based safety factor is derived and implemented through numerical modelling to identify the yield zones in the surrounding rock mass.
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Characteristics of energy evolution and acoustic emission response of concrete under the action of acidic drying-saturation processes cycle
Hengze Yang,Enyuan Wang,Deqiang Cheng,Xiaoran Wang,Baolin Li,Yue Song,Dongming Wang,Weizhen Liu +7 more
TL;DR: In this article , the degradation mechanism of concrete under acidic DSPC was investigated; the calculation formula for the elastic strain energy at peak stress has been corrected and the energy evolution law has been obtained; besides, the evolution characteristics of acoustic emission (AE) parameters were studied using multi-fractal theory and the precursor characteristics of concrete failure were obtained.
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References
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TL;DR: In this paper, a sensitivity program is carried out in order to assess the influence of micro-mechanic parameters on the macroscopic response of the numerical simulation of rock samples, and it sheds light on which are most relevant parameters and how they control the main macro-properties of the simulated rocks.
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A new energy index for evaluating the tendency of rockburst and its engineering application
TL;DR: Based on energy transfer analysis of triaxial unloading tests under four different controlling conditions, an energy index combining the local energy release rate (LERR) and the limit energy storage rate (LESR) was proposed as mentioned in this paper.
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Failure mechanism of fractured rock and associated acoustic behaviors under different loading rates
TL;DR: In this paper, acoustic emission (AE) monitoring was used to evaluate the mechanical, acoustic and micro-cracking behavior of fractured hard sandstones under different uniaxial loading rates.
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Quantitative mechanism of roadway rockbursts in deep extra-thick coal seams: Theory and case histories
Lianpeng Dai,Pan Yishan,Pan Yishan,Pan Yishan,Zhonghua Li,Aiwen Wang,Yonghui Xiao,Feiyu Liu,Shi Tianwei,Zheng Wenhong +9 more
TL;DR: Wang et al. as mentioned in this paper used stability theory, seismic disturbance factor was involved with in-situ stress, mechanical properties of the coal and rock mass, support strength, and roadway size to establish a mechanical model for rockburst and to obtain critical indexes of the surrounding rock fracture and rockburst occurrence.
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Role of coal deformation energy in coal and gas outburst: A review
TL;DR: In this paper , a spatiotemporal evolution model of the release of coal and gas outbursts was proposed, and a new energy release model was established to discuss the role of coal deformation energy in actual outburst.
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