A new criterion of coal burst proneness based on the residual elastic energy index

Gong, Fengqiang; Wang, Yunliang; Wang, Zhiguo; Pan, Jingwen; Luo, Song

doi:10.1016/j.ijmst.2021.04.001

Cited by 112 publications

(51 citation statements)

References 24 publications

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“…The P-wave velocity and density of the granite material were 4.9 km/s and 2766 kg/m 3 ; the uniaxial compressive strength (UCS), elastic modulus, and Poisson’s ratio of granite material were 261.6 MPa, 57.9 GPa, and 0.21, respectively. The granite material in this study had strong rockburst proneness [ 45 , 46 ].…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation on the Influence of Depth on Rockburst Characteristics in Circular Tunnels

Peng

Luo

2022

Sensors

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To investigate the influence of depth on the rockburst of surrounding rock in a circular tunnel, true-triaxial tests at different depths were carried out on cubic granite specimens with a circular through-going hole. A micro camera was used to monitor the rockburst process of the circular hole sidewall in real time. The test results show that the failure process at different depths can be divided into four periods: the calm period, the particle ejection period, the rock fragment exfoliation period, and the rock bursting period. With an increase in depth, the three-dimensional unequal stress state gradually increased; the failure range and the size of rock fragments increased, the initial failure vertical stress linearly increased, and the strength and stability of the surrounding rock were enhanced. Therefore, the support range of surrounding rock should be increased as the depth increased to improve the overall stability of surrounding rock and reduce the failure range.

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Section: Methodsmentioning

confidence: 99%

Experimental Investigation on the Influence of Depth on Rockburst Characteristics in Circular Tunnels

Peng

Luo

2022

Sensors

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“…At present, the academic community has not formed a uniform theory to explain the occurrence mechanism of rockburst in mines. Through decades of theoretical research and investigation of causes of accidents, a series of classical theories have been proposed (Cao et al, 2019;Dai et al, 2021;Xuelong Li et al, 2021;Pang et al, 2016), such as the energy theory (Cook et al, 1966), strength theory, stiffness theory (Procházka, 2004), rockburst tendency theory (Gong et al, 2021;Tsirel' and Krotov, 2001), instability theory (Zhang 1987), and "three factors" theory (Qi and Dou, 2008). With the introduction of interdisciplinary disciplines such as mathematics and mechanics into this research field, the burst start-up theory (Pan et al, 2012), catastrophe theory, and chaos theory have been formed (Pan and Zhang 1992;Liu 2014).…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Inducing Factors of Rockburst Events of Roadways Under Ultrathick Strata

2022

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The overlying strata of the Yima coalfield are ultrathick conglomerate. Aiming at the problem of frequent occurrence of rockburst events in the central Yima coalfield during 2006–2015, the characteristics of rockburst events, microseismic (MS) monitoring, and rockburst event-inducing factors were analyzed through data mining and field investigation methods. The results showed that the rockburst events in roadways mainly occurred during mining of the working face, and they occurred at a large buried depth and were within the influence of mining stress, accompanied by an abrupt energy release. The occurrence of rockburst in roadways was accompanied by a sudden release of energy. The ultrathick strata and the fault nearby were the key influence factors of rockburst events. The stress field of roadway surrounding rocks was changed because of the mining disturbance, roadway repair and maintenance, and blasting, which would change the regional stress fields in the surrounding rocks and induce roadway rockburst events. The characteristics of rockburst events were floor heave, sharp convergence of two side walls, severe damage of the supporting body, and even closure of the roadway. The occurrence of rockburst can be prevented by reducing the mining speed and injecting water into coal seam.

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“…Xie revealed the failure mechanism of rock from the energy point of view and established the strength and failure criterion of rock based on the energy theory (Xie et al, 2005). Based on energy theory, many scientists have established predictive indicators of rock hazard strength grades, such as the peak strength strain energy index (Gong et al, 2019), impact energy index (Yaodong et al, 2011), index of residual elastic properties (Gong et al, 2021), and failure strength index (Gao et al, 2020). However, these indicators cannot meet the requirements of early warning.…”

Section: Introductionmentioning

confidence: 99%

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

et al. 2022

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Research on early warning of rock disaster based on the energy theory is closer to the essence of rock failure. In this paper, static compression tests and acoustic emission (AE) tests of coal rock under 0, 8, 16, and 25 MPa confining pressures were carried out on the MTS815 test system. Energy evolution law in the rock failure process was analyzed according to the relationship between mechanical parameters, AE parameters, and energy dissipation rate (EDR) in the rock failure process. Eventually, a new index for evaluating rock failure precursors was proposed based on EDR. The results show that the EDR has a good correlation with mechanical strength and AE events under different confining pressures. The deformation and failure characteristics of coal rock can be truly characterized by EDR. The variation of EDR can be divided into a quiet stage, a stable increasing stage, an active stage, and a stable stage. The EDR level in the quiet stage is obviously enhanced by confining pressure. When EDR reaches the peak, AE events increase rapidly. In the active stage, the EDR peak value is concentrated and large, the AE event is highly active, and stress drops abruptly, indicating that the EDR is reliable for evaluating the rock failure process. Compared with AE test results, it is found that the warning stress and warning time of the EDR failure precursor occur later than that of the AE failure precursor, and the former is closer to the peak stress of rock, which is more universal in engineering and could provide a better reference value for preventing rock disaster.

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A new criterion of coal burst proneness based on the residual elastic energy index

Cited by 112 publications

References 24 publications

Experimental Investigation on the Influence of Depth on Rockburst Characteristics in Circular Tunnels

Experimental Investigation on the Influence of Depth on Rockburst Characteristics in Circular Tunnels

Mechanism and Inducing Factors of Rockburst Events of Roadways Under Ultrathick Strata

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

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