A coupled macro- and meso-mechanical model for heterogeneous coal

Wang, Jiachen; Wang, Zhaohui; Yang, Shengli

doi:10.1016/j.ijrmms.2017.03.002

Cited by 56 publications

(26 citation statements)

References 49 publications

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“…e research results of Wang et al [34] show that the characteristics of coal macromeso mechanical coupling failure and instability under uniaxial compression are consistent with the results of FLAC3D numerical simulation and the damage of coal observed in the field which will further explain how to simplify the failure process of coal on the coal wall in front of the working face to the problem of uniaxial compression.…”

Section: Analysis On Crack Propagation In Gas-bearing Coal Under Loadsupporting

confidence: 65%

Research on the Disaster-Inducing Mechanism of Coal-Gas Outburst

Nie

Wang

Qiu

2020

Advances in Civil Engineering

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In China, coal-gas outburst is seriously affecting safety of the coal mine. To improve the safety status of underground coal mining, this work investigated the evolution process and occurrence mechanism of coal-gas outburst under the coupling action of stress and gas. Results show that increasing either gas pressure or in-situ stress can make coal destroy and destabilize, and the contribution of gas pressure to coal failure is twice that of in-situ stress. In ultradeep coal mining, coal-gas outburst may occur even under the condition of low gas pressure due to large in-situ stress. Moreover, the larger the mining depth is, the lower the gas index is required for disaster occurrence. The results have certain guiding significance for coal energy mining and the control of coal-gas outburst in deep coal mining.

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Section: Analysis On Crack Propagation In Gas-bearing Coal Under Loadsupporting

confidence: 65%

Research on the Disaster-Inducing Mechanism of Coal-Gas Outburst

Nie

Wang

Qiu

2020

Advances in Civil Engineering

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“…Then, the initial rupture of coal elements was observed. During the evolution process, a substantial elastic recovery of deformation was also monitored in the rock elements [33]. The release of the absorbed strain energy in the rock elements was promoted.…”

Section: Initial Rupture Mechanism Of Coal Elementsmentioning

confidence: 99%

Experimental Investigations on the Progressive Failure Characteristics of a Sandwiched Coal-Rock System Under Uniaxial Compression

et al. 2019

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Overlapped residual coal pillars, together with the surrounding rock strata, play a combined bearing role in ultra-close multiple seam mining. Global stability of the whole bearing system is significant for the mining design, construction, and operation. Laboratory uniaxial compressive experiments for different kinds of sandwiched coal-rock specimens are carried out to investigate the progressive failure characteristics and mechanisms. Results show that: (1) The mechanical behavior of the sandwiched coal-rock specimen is mainly divided into four stages during the failure process. The response of the electrical resistivity and the evolution of acoustic emission (AE) energy are in good agreement with the mechanical behaviors at different stages, which are a reflection of the global failure characteristics of sandwiched specimens. (2) The distribution of AE events and the development of local strain can provide further insight into the local failure characteristics of coal elements or rock elements in sandwiched specimens. AE events are more likely to be generated in coal elements, which can propagate across coal-rock interfaces and induce damage to rock elements in a certain area. Similarly, the unbalanced deformation characteristics of coal elements and rock elements are apparently revealed in the progressive failure process. (3) Progressive failure of a sandwiched coal-rock specimen is closely associated with the interactions between the coal elements and rock elements. Initial failure usually appears in the coal elements. At this process, the recovery of elastic deformation and the output of strain energy are observed in the rock elements, which can accelerate the rupture of coal elements. In turn, the dynamic fracture energy generated in the rupture process of coal elements can propagate into rock elements and induce damage to rock elements a certain area. (4) The experimental results are helpful for maintaining the long-term stability of a sandwiched coal-rock system in ultra-close multiple seam mining.

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“…Therefore, it is significant to investigate the energy evolution of the microstructures in rock. The techniques used in existing studies on the micro-mechanical properties of rocks have mainly included the characterization of the heterogeneous distribution [17][18][19], computed tomography (CT) scanning techniques [20][21][22], and digital imaging processing (DIP) technology [23][24][25]. DIP usually adopts an image segmentation approach to acquire the image information of microstructures in rock, and the information is then inputted into numerical software to realize the reconstruction of the microstructures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Research on Energy Evolution in Granite under Different Confining Pressures Using Otsu’s Digital Image Processing and PFC2D

et al. 2019

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Research on energy accumulation and releasing in the rock plays a key role on revealing its failure mechanism. This paper establishes a microscopic structure model of granite using Otsu digital image processing (DIP) technology and particle flow code software (PFC2D). A series of numerical compression tests under different confining pressures were conducted to investigate the macro and micro characteristics of energy evolution in granite. The results showed that the energy evolution of granite is divided into three stages: stable accumulation, slow dissipation, and rapid release. With increasing confining pressure, the strain energy accumulation ratio decreased exponentially and the peak value of strain energy increased linearly. It was found that the energy accumulation speed in the pre-peak stage increased as a linear function, while the energy release speed in the post-peak stage decreased as an exponential function. In addition, the feldspar is the main microstructure which played a major part in accumulating energy in granite. However, the unit mineral energy of mica particles was bigger than that of feldspar and quartz. When subjected to increasing confining pressure, the feldspar’s total energy growth rate was fastest. Meanwhile, the mica’s unit energy growth rate was fastest.

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A coupled macro- and meso-mechanical model for heterogeneous coal

Cited by 56 publications

References 49 publications

Research on the Disaster-Inducing Mechanism of Coal-Gas Outburst

Research on the Disaster-Inducing Mechanism of Coal-Gas Outburst

Experimental Investigations on the Progressive Failure Characteristics of a Sandwiched Coal-Rock System Under Uniaxial Compression

Numerical Research on Energy Evolution in Granite under Different Confining Pressures Using Otsu’s Digital Image Processing and PFC2D

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