Mechanical behavior of coal under different mining rates: A case study from laboratory experiments to field testing
Mingzhong Gao,Mingzhong Gao,Jing Xie,Gao Yanan,Gao Yanan,Wang Wenyong,Cong Li,Bengao Yang,J. F. Liu,Heping Xie,Heping Xie +10 more
TLDR
In this paper, a preliminary case investigation of the coal at various mining rates in both the laboratory scale and field scale was performed, where the uniaxial compressive strength and releasable elastic strain energy (Ue) increase with increasing loading rate when the loading rate is below a threshold.Abstract:
During deep mining, the excavation disturbance stress path is the domination factor for the stability of the surrounding rock mass as well as the ground pressure. One of the important parameters of the stress path is the loading or unloading rate of the disturbed rock or coal, which depended on the mining rate. To achieve a well understanding of the mining rate and its effect on the coal behavior, a preliminary case investigation of the mechanical properties of the coal at the various mining rates in both the laboratory scale and field scale was performed. Based on the uniaxial compression test and the digital image correlation (DIC) method, the mechanical behavior of the coal samples, such as the evolution of the strength, surface deformation, crack propagation, and elastic strain energy of the coal under the various loading rates were analyzed. A threshold range of the loading rate has been observed. The uniaxial compressive strength (UCS) and releasable elastic strain energy (Ue) increase with increasing loading rate when the loading rate is below the threshold. Otherwise, the UCS and Ue may decrease with the loading rate. Under the low loading rate (≤0.05 mm/min), the tensile deformation of the original defects could result in crack coalescence, whereas failure of the coal matrix is the key contributor to the crack coalescence under the high loading rate (greater than0.05 mm/min). Afterwards, with the consideration of the bearing capacity (UCS) and energy release of the mining-disturbed coal mass (Ue), a power exponential relationship between the mining rate (MR) in the field and the critical loading rate (vc) in the laboratory was proposed. The application potential of the formulas was then validated against the field monitored data. Finally, based on the critical loading rate, the released strain energy, and the monitored pressure on the roof supports, a reasonable mining rate MR for the Ji15-31030 working face was determined to be approximately 3 m/d.read more
Citations
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Discing behavior and mechanism of cores extracted from Songke-2 well at depths below 4,500 m
Gao Mingzhong,Hao Haichun,Xue Shouning,Lu Tong,Cui Pengfei,Gao Yanan,Xie Jing,Yang Bengao,Xie Heping +8 more
TL;DR: Wang et al. as discussed by the authors used three-dimensional dynamic scanning technology to reconstruct the fracture morphology of disced cores extracted from Songke-2 as well as part of the Chinese Continental Scientific Drilling Project.
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The mechanism of microwave rock breaking and its potential application to rock-breaking technology in drilling
Ming Zhong Gao,Bengao Yang,Jing Xie,S. Ye,Jun-Jun Liu,Yi-Ting Liu,Ruifeng Tang,Haiyong Hao,Xuan Wang,Xiang Wen,Xue Min Zhou +10 more
TL;DR: In this paper , the authors conducted experimental and numerical simulation research on typical deep, hard rock granite and found that the interaction of thermal stress and in situ stress would cause the inside of the rock stratum to separate into a disturbed deterioration area, disturbed unloading area and initial stress area.
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Experimental study on the mechanical and failure behaviors of deep rock subjected to true triaxial stress: A review
TL;DR: In this paper , a review of the development of true triaxial testing apparatus and corresponding research progress on rock deformation, strength, failure mode, brittleness, and energy as well as the 3D volumetric fracturing (dynamic disaster) properties of deep rocks under true Triaxial stress is presented.
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Effect of Pile-Soil Relative Stiffness on Deformation Characteristics of the Laterally Loaded Pile
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References
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Book
Image Correlation for Shape, Motion and Deformation Measurements: Basic Concepts,Theory and Applications
TL;DR: In this paper, a comprehensive overview of image correlation for shape, motion and deformation measurements is provided. But, the authors do not discuss the effect of out-of-plane motion on 2D measurements.
Journal ArticleDOI
Digital Imaging Techniques In Experimental Stress Analysis
W. H. Peters,W. F. Ranson +1 more
TL;DR: In this paper, the surface displacement components in laser speckle metrology were measured using a digital image scanner interfaced to a computer. Butt et al. used a boundary integral equation method to calculate surface traction in the contour.
Journal ArticleDOI
Volumetric strain associated with methane desorption and its impact on coalbed gas production from deep coal seams
Xiaojun Cui,R. Marc Bustin +1 more
TL;DR: In this article, the authors investigated quantitatively the effects of reservoir pressure and sorption-induced volumetric strain on coal-seam permeability with constraints from the adsorption isotherm and associated volumetrized strain measured on a Cretaceous Mesaverde Group coal (Piceance basin) and derived a stressdependent permeability model.
Journal ArticleDOI
Mineral supply for sustainable development requires resource governance
Saleem H. Ali,Saleem H. Ali,Saleem H. Ali,Damien Giurco,Nicholas Arndt,Edmund Nickless,Graham Brown,Alecos Demetriades,Raymond Durrheim,Maria Amélia Enriquez,Judith A. Kinnaird,Anna Littleboy,Lawrence D. Meinert,Roland Oberhänsli,Janet Salem,Richard Schodde,Gabi Schneider,Olivier Vidal,Natalia Yakovleva +18 more
TL;DR: This work presents, through analysis of a comprehensive set of data and demand forecasts, an interdisciplinary perspective on how best to ensure ecologically viable continuity of global mineral supply over the coming decades.
Journal ArticleDOI
Dynamic Characteristics of Granite Subjected to Intermediate Loading Rate
Xibing Li,T.S. Lok,Jian Zhao +2 more
TL;DR: In this article, a large diameter split Hopkinson pressure bar (SHPB) was used to obtain the complete stress-strain relationship of the Bukit Timah granite at medium strain rate.