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Hu Y.-X.,Central South University | Li X.-B.,Central South University | Li X.-B.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

A Bayes discriminant analysis method to identify the risky of complicated goaf in mines was presented. Nine factors influencing the stability of goaf risky, including uniaxial compressive strength of rock, elastic modulus of rock, rock quality designation (RQD), area ratio of pillar, ratio of width to height of pillar, depth of ore body, volume of goaf, dip of ore body and area of goaf, were selected as discriminant indexes in the stability analysis of goaf. The actual data of 40 goafs were used as training samples to establish a discriminant analysis model to identify the stability of goaf. The results show that this discriminant analysis model has high precision and misdiscriminant ratio is 0.025 in re-substitution process. The instability identification of a metal mine was distinguished by using this model and the identification result is identical with that of practical situation. © 2012 The Nonferrous Metals Society of China. Source


Gong F.,Central South University | Gong F.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines | Lu J.,Central South University
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014

Mine water inrush is one of the greatest natural disasters in the mining production process. Quick and effective identification of mine water inrush source is an important guarantee of safe production in mining engineering. Seven kinds of water chemical composition having been selected as the sample variables in water bursting source recognition, and a forecast model of water inrush source is built by combining distance discriminant analysis with principal component analysis. This model is tested and applied in the different water layer of Xieyi Coal Mine in Huainan with thirty-three training samples and eleven predicting samples, and it is compared with the gray correlation discrimination model and Bayesian discrimination model. The results show that the model shows 95% of accuracy, and the predicting correct rate is up to 91%, which provides a new method for mine water inrush identification. Source


Li X.,Central South University | Li X.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines | Tao M.,Central South University | Tao M.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines
Geomechanics and Engineering | Year: 2015

The governing equations of wave propagation in one dimension of elastic continuum materials are investigated by taking the influence of the initial stress into account. After a short review of the theory of elastic wave propagation in a rock mass with an initial stress, results indicate that the initial stress differentially influences P-wave and S-wave propagation. For example, when the initial stress is homogeneous, for the P-wave, the initial stress only affects the magnitude of the elastic coefficients, but for the S-wave, the initial stress not only influences the elastic coefficients but also changes the governing equation of wave propagation. In addition, the P-wave and S-wave velocities were measured for granite samples at a low initial stress state; the results indicate that the seismic velocities increase with the initial stress. The analysis of the previous data of seismic velocities and elastic coefficients in rocks under ultra-high hydrostatic initial stress are also investigated. © 2015 Techno-Press, Ltd. Source


Li X.-B.,Central South University | Li X.-B.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines | Yao J.-R.,Central South University | Gong F.-Q.,Central South University | Gong F.-Q.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2011

The energy storage characteristics of hard rock in metal mines under high stress was described from the deep mining environment. And the inevitable trend of continuous mining methods in the future with the increase of exploitation depth of metal mines was also analyzed. For hard rock in metal mines under high stress, the dynamic disturbance caused by continuous mining was conducted on it, which can be considered as a mechanical problem coupled static and dynamic loads. On this basis, three key dynamics problems were analyzed by using the theory of coupled loads as follows: the system disturbance and rock burst in deep metal mines exploitation, mine earthquake and drift instability caused by blasting in deep mines, energy release and orderly regulation in deep metal mines exploitation. Theoretical analysis and engineering practice proved that several dynamics problems in deep metal mines can be explained by using the theory of coupled static and dynamic loads, which will provide some engineering practice guidance for deep exploitation. Source


Gong F.-Q.,Central South University | Gong F.-Q.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines | Li X.-B.,Central South University | Li X.-B.,Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

Dynamic triaxial compression tests of sandstone were conducted with a modified triaxial split Hopkinson pressure bar (SHPB) coupled static and dynamic loads. For the comparison, the quasi-static triaxial compression tests were also conducted with RMT-150C device. The influence of confining pressure on dynamic characteristics of sandstone and its failure model in impact tests were analyzed based on the experimental data. The results showed that the dynamic compression strength of sandstone increases with increase in strain rate when the confining pressure is a constant; when the strain rate is a constant, the dynamic compression strength and the elastic modulus of sandstone increases with increase in confining pressure; the critical incident energy for rock failure increases with increase in the confining pressure; there is a linear increasing relationship between the energy absorption per unit volume of rock and strain rate; under the triaxial dynamic impact, there are some compression-shear breaking surfaces inside rock and rock keeps stable when the strain rate is low, when the strain rate is high, rock failures and breaks into some cone-shaped blocks. Source

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