Research on the Rockburst Tendency and AE Characteristics of Inhomogeneous Coal-Rock Combination Bodies

Tan, Yunliang; Guo, Wei‐yao; Gu, Qingheng; Zhao, Tong; Yu, Fenghai; Hu, Shengmin; Yin, Yanchun

doi:10.1155/2016/9271434

Cited by 27 publications

(21 citation statements)

References 9 publications

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“…Under the action of external load, cracks will occur in coal and rock mass, and stress waves will be released in the process of crack propagation, that is, the so-called acoustic emission phenomenon. Many scholars monitor the crack propagation in the coal and rock loading process by acoustic emission-charge signal, as an auxiliary means to study the mechanical properties of coal-rock mass [12][13][14][15]. For example, Tan et al [14] studied the influence of homogeneity on the rock-burst tendency and on AE characteristics of coal-rock combination body, and the result show that the more inhomogeneous the coal-rock combined body is, the shorter the lasting time in the active period of AE characteristics will be.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

et al. 2019

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In this manuscript, the numerical coal-rock combined bodies with different height ratios of rock part to coal-rock combined body (HRRC) were established by particle flow code (PFC) firstly, and then the influence of different HRRC on mechanical properties and numerical acoustic emission (AE) characteristics of coal-rock combined bodies were investigated. Finally, the damage constitutive model of the coal-rock combined body was discussed. The research results show that with the increase of the HRRC, the UCS and the elastic modulus (E) of the combined coal-rock bodies increased. The failure of coal-rock combined bodies is mainly focused on the coal body. The evolution law of AE hits of coal-rock combined bodies have three stages, named stable stage, rapid ascending stage, and rapid descending stage. The damage variable curves of coal-rock combined body have two stages, named slowly damage stage and sharply damage stage. The damage constitutive relation based on AE hits can well reflect the stress-strain relationships with a lower HRRC. However, for a higher HRRC, the damage constitutive equation is not accurately and the damage of the rock part in the coal-rock-combined body should be considered.

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Section: Introductionmentioning

confidence: 99%

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

et al. 2019

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“…e result showed that the vibrational signals recorded before impact-induced failure exhibit remarkable precursory characteristics indicative of a rock burst. Tan et al [27] explored the effect of the homogeneity of a CR combined body on AE energy by PFC numerical simulation software. e result indicated that the stronger the homogeneity of coal and rock masses, the larger the rock burst tendency of a CR combined body.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of a Coal‐Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Zhao

Gao

et al. 2019

Advances in Civil Engineering

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A coal-rock (CR) combined body can be used to simulate structures of coal and rock strata, and its impact-induced failure characteristic conforms more close to engineering practice. Exploring the mechanical properties and impact energy in a CR combined body contributes to better predictions of rock bursts in coal mines. In the study, the mechanical properties of CR combined bodies with four different inclinations (0°, 15°, 30°, and 45°) of structural planes were measured, and also their failure mechanism was analysed. Based on the theory of particle mechanics, a calculation model for impact energy in a CR combined body with inclinations was established and then verified by using monitored acoustic emission (AE) data. The test results showed that inclination affected mechanical properties and failure characteristics of the CR combined body, i.e., the larger the inclination, the lower the strength and impact energy in the CR combined body and the lower the level of damage. The proposed calculation model for impact energy revealed the mechanical essence of energy accumulation and release of a CR combined body, providing a reference for investigating rock burst in coal mines.

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“…He et al [21] conducted a true-triaxial unloading test on limestone with acoustic emission monitoring and researched the relationship between the characteristics of rock burst and AE parameters. Tan et al [22] found that the AE characteristics can be used to predict the rock burst tendency of the coal-rock combination body. The Kaiser Effect [23] and Felicity Effect [24] of rock were found and used to reflect the damage and failure characteristics of rock materials [25,26].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Behavior of Dry and Water Saturated Igneous Rock with Acoustic Emission Monitoring

Guo

Feng

et al. 2018

Shock and Vibration

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The uniaxial cyclic loading tests have been conducted to study the mechanical behavior of dry and water saturated igneous rock with acoustic emission (AE) monitoring. The igneous rock samples are dried, naturally immersed, and boiled to get specimens with different water contents for the testing. The mineral compositions and the microstructures of the dry and water saturated igneous rock are also presented. The dry specimens present higher strength, fewer strains, and rapid increase of AE count subjected to the cyclic loading, which reflects the hard and brittle behavior and strong burst proneness of igneous rock. The water saturated specimens have lower peak strength, more accumulated strains, and increase of AE count during the cyclic loading. The damage of the igneous rocks with different water contents has been identified by the Felicity Ratio Analysis. The cyclic loading and unloading increase the dislocation between the mineral aggregates and the water-rock interactions further break the adhesion of the clay minerals, which jointly promote the inner damage of the igneous rock. The results suggest that the groundwater can reduce the burst proneness of the igneous rock but increase the potential support failure of the surrounding rock in igneous invading area. In addition, the results inspire the fact that the water injection method is feasible for softening the igneous rock and for preventing the dynamic disasters within the roadways and working faces located in the igneous intrusion area.

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Research on the Rockburst Tendency and AE Characteristics of Inhomogeneous Coal-Rock Combination Bodies

Cited by 27 publications

References 9 publications

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

Failure Mechanism of a Coal‐Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Dynamic Mechanical Behavior of Dry and Water Saturated Igneous Rock with Acoustic Emission Monitoring

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