Influence of strain energy released from a test machine on rock failure process

Xu, Yuhang; Cai, Ming

doi:10.1139/cgj-2017-0256

Cited by 28 publications

(7 citation statements)

References 44 publications

(58 reference statements)

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“…Tan et al [79] analysed the burst liability of coal-rock composite samples using particle flow code. Xu and Cai [80] conducted a FEM-based numerical test to analyse the strain energy released from test machines, which causes rock instability failures and delayed rock bursts.…”

Section: E Burst Failure Mechanism Of Coal and Rock Massmentioning

confidence: 99%

Preliminary Discussion on Comprehensive Research Method for Rock Burst in Coal Mine Based on Newton’s Second Law

Zuo

Song

Jiang

et al. 2020

Shock and Vibration

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Rock burst is one of the major dynamic disasters that directly threaten production safety in coal mines. According to the current research, the occurrence of rock burst can be described by the generalized Newton’s second law with three elements which are research object, force condition, and motion state. These three elements refer to the coal and rock mass in the mining area, concentrated static and dynamic loads, and dynamic instability of surrounding rock, respectively. On this basis, a comprehensive rock burst research method involving the three elements of Newton’s second law was proposed, which especially focuses on the investigation into geological conditions of mining areas. The research procedure of this method specifically includes the detailed exploration of engineering geological bodies, the classification and stability evaluation of surrounding rock, the measurement and inversion of in situ stress, the evolution analysis of mining-induced stress field, energy field, and fracture field, the study of multiscale failure mechanism of coal and rock mass, the establishment of theoretical failure model of coal and rock mass, the real-time monitoring and warning in potentially dangerous areas, and the reasonable prevention and control in key risk zones. As a preliminary discussion, the significant research progress in each aspect mentioned above has been reviewed and the feasible research directions of rock burst are presented in this paper.

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Section: E Burst Failure Mechanism Of Coal and Rock Massmentioning

confidence: 99%

Preliminary Discussion on Comprehensive Research Method for Rock Burst in Coal Mine Based on Newton’s Second Law

Zuo

Song

Jiang

et al. 2020

Shock and Vibration

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“…If the host rock (loading system) relative to a mine pillar is too "soft", the energy that is released from the surrounding rock during yielding of a pillar will exceed that at which the pillar can absorb and a burst will occur. The key concept of the LMS theory is that the energy that is released from the surrounding rock mass caused unstable mine pillar failure 25,43,44 . For www.nature.com/scientificreports/ the coal sample of the coal-rock specimens, the sandstone sample behaved like the surrounding rock.…”

Section: Unstable Coal Failurementioning

confidence: 99%

Experimental and numerical investigations on the failure processes and mechanisms of composite coal–rock specimens

Gao

Kang

Yang

2020

Sci Rep

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Brittle failure is a fundamental failure pattern in many different materials, from small nanoscale materials with single crystals to the large earth crust. Many efforts have been dedicated to understanding the brittle failure mechanisms of individual brittle and semi-brittle materials. Limited studies have been conducted on the brittle failure of composite materials with interaction and energy feedback between different materials. Here we investigated the brittle failure pattern of coal–rock composite materials under uniaxial compression by laboratory tests and numerical simulations. We used a high-speed camera to capture the failure of coal–rock specimens. For all three tested coal–rock combined specimens, the rock failed with a splitting pattern that resulted from a single tensile fracture that developed sub-parallel to the loading direction. We regarded this brittle failure as a sliding-induced tensile fracture from frictional drag that was caused by unequal lateral deformation of the rock and coal under identical axial loading. The tensile crack propagated stably at ~ 0.05 times the Rayleigh wave speed c R . We observed an unstable failure pattern of the coal samples that was characterized by the ejection of small pieces from the coal specimen surface. This behavior is attributed to the strain energy that is stored in the rock specimen, which releases when the coal fails. The excessive strain energy transitions into dynamic energy during coal failure. Our findings provide insight into the brittle failure mechanisms of composite materials and have significant implications at scales relevant to seismicity, engineering applications and geohazards.

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“…The local mine stiffness theory has been extensively used for explaining unstable rock failure mechanisms including rockbursts and coal bursts (Iannacchione 1988;Pen and Barron 1994;Adhikary et al 2002;Jaiswal and Shrivastva 2012;Kias 2013;Gu and Ozbay 2014;Gao et al 2019c). The key concept of the local mine stiffness theory is that it is the energy released from the surrounding rock mass caused the unstable failure of the mine pillar (Chen et al 1997;Xu and Cai 2017;Ma et al 2018). To the authors' knowledge, however, direct evidence of energy releasing and transferring is limited.…”

Section: Energy Transfermentioning

confidence: 99%

An Experimental Investigation into the Strainburst Process Under Quasi-static Loading

2020

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Rockbursts cause damage to underground excavations in a sudden and violent manner and are associated with mining-induced seismic events. We propose a simple experimental method to study strainburst process in the laboratory, that simply involves a common compression testing apparatus and rock-coal-rock specimens. Strainbursts of coal samples are successfully produced and the burst process is monitored using high-speed camera and acoustic emission sensors. The strainburst mechanism is characterized by an initial ejection of small coal fragments followed by the ejection of large coal blocks. We found that the strainbursts are caused by the elastic strain energy stored in the rock samples during the uniaxial compression. The amount of the transferred energy is significantly less than the elastic energy stored in the coal sample but plays an important role in triggering strainbursts. The greater the transferred energy, the greater the damage severity of strainbursts occurred in the coal sample. Tensile cracking subparallel to the vertical loading direction and tangential compressive stress appears to play a dominant role in the strainburst failure mechanism.

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Influence of strain energy released from a test machine on rock failure process

Cited by 28 publications

References 44 publications

Preliminary Discussion on Comprehensive Research Method for Rock Burst in Coal Mine Based on Newton’s Second Law

Preliminary Discussion on Comprehensive Research Method for Rock Burst in Coal Mine Based on Newton’s Second Law

Experimental and numerical investigations on the failure processes and mechanisms of composite coal–rock specimens

An Experimental Investigation into the Strainburst Process Under Quasi-static Loading

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