Variational analysis of dynamics of fissured poroelastic rocks

Gorgogianni, Anna; Papargyri-Beskou, S.

doi:10.1016/j.soildyn.2015.09.019

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…Rudajev [26] and Makoto et al [27]. Considering strain, dissipation and kinetic energies as well as the work of external force, a variation principle had been established by Gorgogianni and Papargyri-Beskou [28] to analyze the dynamic of fissured poroelastic rocks. Based on the shallow buried coal seams covered with thick loose layers in hilly loess areas of western China, Liu et al [29] developed a mechanical model for a mining slope with slope stability analysis, and studied the mechanism of formation and development of a slipping ground fissure by the circular slipping slice method.…”

Section: Introductionmentioning

confidence: 99%

Microseismic fuzzy comprehensive evaluation method of coal burst - A case study in Zhaolou Coal Mine

Zhang,

Liang,

Lin

et al. 2024

Preprint

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Based on a coal burst in LW 1305 and combined with the curve of stress vs. strain, six multi-parameters are proposed to forewarn coal burst induced by static high-stress concentration and impact loading, containing microseismic (MS) activity S value, fault total area A(t) value, lacking of shock b value, statistical Z value, MS entropy value and the dominant frequency. The precursors mainly characterize the enhancement trend of S value, the suddenly and sharply rise of A(t) value, the continuous and abnormal lower b value, the increasing absolute value of Z sharply and large than 2, the continuous and abnormal decline of Qt value, and the dominant frequency moving to low-frequency band, respectively. The coal burst in LW 1305 was induced by the intrinsic static high-stress concentration and the external strong impact loading generated by fracturing of the key stratum. Essentially, a lot of micro-fissures inside the key stratum had initiated, converged and connected to form the macro-fracture above LW 1305, which was verified by the attenuation rate of K value. Considering the time-varying effect of the overlying stratum movement, the curves of the six multi-parameters have a good agreement with that of stress vs. strain, which indicates it is reasonable to take the observed zone as a whole system to investigate variation of the multi-parameters and fracturing of the key stratum. It is noteworthy that the MS multi-parameters should be combined with reasonable mining arrangement and corresponding prevention measures to monitor, forecast and control coal bursts in the field.

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Section: Introductionmentioning

confidence: 99%

Microseismic fuzzy comprehensive evaluation method of coal burst - A case study in Zhaolou Coal Mine

Zhang,

Liang,

Lin

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The AE activity associated with rock failure and friction was studied in combination with rock information by Zhang et al 16 , Mansurov 17 , Rudajev 18 and Makoto et al 19 . Considering strain, dissipation and kinetic energies as well as the work of external force, a variation principle was established by Gorgogianni and Papargyri-Beskou 20 to analyze the dynamics of fissured poro-elastic rocks. Based on the shallow buried coal seams covered with thick loose layers in hilly loess areas of western China, according to many researchers 21 – 23 , laboratory and in situ evidence has shown that under the superposition of static and dynamic loads, the original minor fissures in coal and rock masses initiate, converge and connect into macro-fractures, eventually leading to the failure of coal and rock masses.…”

Section: Introductionmentioning

confidence: 99%

Microseismic comprehensive evaluation method for coal burst: a case study in the Zhaolou Coal Mine

Zhang,

Liang,

Lin

et al. 2024

Sci Rep

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To explore the multiparameter precursor characteristics of pre- and post-coal burst. Based on a coal burst of LW 1305 in the Zhaolou Coal Mine, an early warning method combining stress‒strain curve and microseismic multiparameter is proposed. The research results show that coal burst was induced by the intrinsic static high-stress concentration and the strong external impact loading generated by fracturing of the key stratum. The precursors mainly characterize the enhancement trend of the S value, the sudden and sharp increase in the A(t) value, the continuous and abnormal decrease in the b value, the increasing absolute value of Z sharply and larger than 2, the continuous and abnormal decrease in the Qt value, and the dominant frequency moving to the low-frequency band. Essentially, many micro-fissures inside the key stratum initiated, converged and connected to form macro-fractures, which was verified by the attenuation rate of the K value. Considering the time-varying effect of the overlying stratum movement, the curves of the six parameters agree well with those of stress vs. strain, which indicates that it is reasonable to take the observed zone as a whole system to investigate the variation in the multiple parameters and fracturing of the key stratum. The research results can be applied to the monitoring, early warning and control of coal burst so that effective safety measures can be taken in real time.

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Variational analysis of dynamics of fissured poroelastic rocks

Cited by 2 publications

References 25 publications

Microseismic fuzzy comprehensive evaluation method of coal burst - A case study in Zhaolou Coal Mine

Microseismic fuzzy comprehensive evaluation method of coal burst - A case study in Zhaolou Coal Mine

Microseismic comprehensive evaluation method for coal burst: a case study in the Zhaolou Coal Mine

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