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Hu J.-H.,Central South University | Hu J.-H.,Key Laboratory of Deep Mining and Disaster Control in Hunan Province | Shang J.-L.,Central South University | Shang J.-L.,Key Laboratory of Deep Mining and Disaster Control in Hunan Province | And 4 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

There exist complicated non-linear relations between explosive vibration effect and its affecting factors, and accurate prediction of the attenuation law of blasting vibration is the basis of blasting design and disaster control. Based on the analysis of defects of traditional Sadaovsk formula, a modified Sadaovsk formula (MSF) considering the height deviation between mass point and blast center was introduced. A multiple linear mathematical model for predicting the attenuation law of blasting vibration was established. The unknown parameter vectors(K, α, β) in the model were calculated by using least square method, thus the concrete MSF for accurately predicting the attenuation law of blasting vibration was achieved. The single-hole blasting vibration of the zinc-copper deposit in Tongkeng Mine was monitored and the data were analysed by using the proposed method. The results show that the proposed MSF is reliable, and can provide scientific guide for blasting design in zinc-copper deposit. Source


Gao F.,Central South University | Zhou K.,Central South University | Li J.,Central South University | Luo X.,Liuzhou China Tin Group Co.
Proceedings - 2010 3rd IEEE International Conference on Computer Science and Information Technology, ICCSIT 2010 | Year: 2010

Because of the complex influencing factors, it is very difficulty to resolve the problem of large scale pillar extraction and goaf disposal in underground mine. Fortunately, with the rapid development of computational mechanics, numerical methods and computer technology, the feasibility of numerical simulation has become an important feature of the current rock mass mechanics. Accordingly, using the employment of numerical simulation techniques in the calculation and study on failure of single pillar, and even pillar group is undoubtedly a greatly feasible and effective means. In this paper, mining technical features of pillar group of No.92 orebody in Tongkeng Tin Mine of Huaxi Group was analyzed and stoping sequence in zoning of pillar group was designed. On the basis of modeling by using Surpac software, FLAC3D software was then used for numerical simulation. Combined with simulation results and field condition, the reasonable stoping sequence was determined. Also, the results provide scientific reference basis for the safety production of the mine. © 2010 IEEE. Source


Shi L.,Jianghan University | Shi L.,Hubei Key Laboratory of Industrial Fume and Dust Pollution Control | Chen H.M.,Jianghan University | Chen H.M.,Hubei Key Laboratory of Industrial Fume and Dust Pollution Control | And 4 more authors.
Applied Mechanics and Materials | Year: 2012

The purpose of the paper is study the tunnel air environment adjustment. We built a set-up according to the similarity law. Temperature, air flow velocity, and the humidity in the model tunnel were measured using a measurement system. Experimental data were obtained under the ventilation duct at the top of the tunnel. The results show that adjusting velocity and humidity of the supply air flow can satisfy the Safety Regulation for Metal and No-metal Mines. © (2012) Trans Tech Publications, Switzerland. Source


Shang J.-L.,Central South University | Shang J.-L.,Key Laboratory of Deep Mining and Disaster Control in Hunan Province | Hu J.-H.,Central South University | Hu J.-H.,Key Laboratory of Deep Mining and Disaster Control in Hunan Province | And 4 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

In this paper, in order to improve the present methods of rock blastability classification, a prediction model of game theory-matter-element extension for blastability classification was established. Firstly, based on the analysis of main causes of blastbility, three indexes were chosen as the evaluation indicators and the classification standards were confirmed. Meanwhile, in order to remedy the defect of the correlation function cannot be calculated when the eigenvalue exceeds the controlled field, the blastability classification standards were normalized. Secondly, based on the game theory, the synthetic weight values of eigenvalue were determined by integrating the objective-dynamic weight and subjective-static weight, which can solve the problems occurred in traditional matter-element extension assessment method, that is, the indicator weight only depends on the eigenvalue, and ignores the significance of feature. Finally, the classification of blastability was predicted by using the maximum incidence degree criterion, and the prediction model of game theory-matter-element extension for blastability classification was proposed. The application results show that the blastability of surrounding rock and ore body in the roof is of medium-grade, and the surrounding rock in footwall is of relatively low-grade. The predication results agree well with the project reality geological situation, thus, the corresponding control measures about the blasting in mine engineering were put forward. Source


Hu J.-H.,CAS Wuhan Institute of Rock and Soil Mechanics | Hu J.-H.,Central South University | Zhou K.-P.,Central South University | Luo X.-W.,Liuzhou China Tin Group Co. | Deng H.-W.,Central South University
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Technology of blast-induced caving roof based on the successive mining, it is said that the caving zone of fracturing are controlled through the pre-splitting blasting and inducing fracture are developed by the forced blasting. With the development and expanding of the cracks, the rock mass would have been instability and caving in the roof. But, to the process of the induction caving roof by blasting in the underground mine, the effects were invisible to the pre-splitting blasting and the forced blasting. It is difficult to quantitatively evaluate the effect of blasting. Using the borehole camera system, the technique of front view and digital panorama were used to inspect the effect of blasting. The shape of the hole-wall was detected before blasting, and the effect of the inducing fracture was inspected after blasting in the hole-wall. Especially, the cracks character was described by the digital panoramic borehole camera. The photographs were analyzed by the view and digital method. The results of the digital panoramic borehole camera show: (1) The pre-splitting cracks had been formed after pre-splitting blasting. Its width is up to 20-40 mm; and the half wall of hole could be seen in the bottom. (2) Large of secondary cracks were formed in the rock mass of roof, the crack form is "X". And the original cracks were expanded. (3) The mass shapes of blasting was right, the rock stacked by the natural angle of slope. It is advantage to induction caving roof to the large cracks and ruptured structural rock mass. Source

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