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Yang G.T.,Central South University | Yang G.T.,Changsha Engineering and Research Institute of Nonferrous Metallurgy | Li X.B.,Central South University | Ding J.G.,Central South University
Rock Mechanics: Achievements and Ambitions - Proceedings of the 2nd ISRM International Young Scholars' Symposium on Rock Mechanics | Year: 2012

Based on the previous research results and in considerations of the slope rock mass under the action of both dead-load stress and horizontal tectonic stress, spatial mechanical analysis is carried out with the elastic mechanics method of the inversely truncated tapered pit surface. The relationship between the designed slope angle, the rock physical and mechanical parameter, excavation radius and radial component of the horizontal tectonic stress are derived to provide the theoretical basis for rational slope design and for the reduction of overburdens from the furrow pit. And based on the nonlinear mapping function of the artificial neural network and with the help of RBF artificial neural network model, sensibility analysis is implemented for the parameters affecting the slope angle design. The results of the case study showed that the radial component σ r of the horizontal tectonic stress toward the rock mass, bulk density γ and rock mass friction factor f are the primary influencing factors, while the open pit radius r and ring modulus E θ are the secondary considerations. © 2012 Taylor & Francis Group. Source


Tu F.-B.,Central South University | Wu H.-F.,Central South University | Zhang L.,Changsha Engineering and Research Institute of Nonferrous Metallurgy | Zhou J.-M.,Central South University | Jia Y.,Central South University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

By simulating the shell side of radial heat pipe heat exchanger with the software FLUENT, the characteristics of smoke velocity, temperature and local convection heat transfer coefficient along the shell side of heat exchanger were analyzed, and the structural parameters were optimized. The results show that on the shell side of heat exchanger, the closer area to the heat pipe, the bigger the temperature gradient is; a wedge eddy is formed in the rear of heat pipe as smoke flows through heat pipe, the velocity maximizes when detached fluids appears; in the central region, turbulence intensity is the biggest, and the heat transfer intensity is obviously higher than that of the edge, and the smoke temperature at the rear of heat pipe is lower than that at the edge of heat pipe. Comparing the simulation results with the test results, the errors are within 10%. Then by changing structural parameters, the shell side convective heat transfer of radial heat pipe heat exchanger were studied, and the structural parameters optimization were established: transverse space of heat pipe is from 114 to 120 mm; longitudinal space of heat pipe is from 120 to 125 mm; fin height is below 26.5 mm; and fin space is 6 mm. Source


Sun W.,University of Science and Technology Beijing | Wu A.-X.,University of Science and Technology Beijing | Wang H.-J.,University of Science and Technology Beijing | Zhou Y.,University of Science and Technology Beijing | And 2 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

Mass fraction and waste rock proportion are main influence factors which affect flow characteristics of backfill paste mixed by unclassified tailings and waste rock. To study of the influence law of these factors about paste flow characteristics may have important significance about controlling paste flow characteristics. Shear test of mixed backfilling is conducted with the improved small direct shear device and then get the change law of mixed backfilling. The test results show that paste presents approximate elastic at prophase of force-deformation and the stepladder trend in displacement-shear stress curve increases with the increase of waste rock proportion. Cohesion of paste depends on mass fraction and internal fraction angle is affected by mass fraction and waste rock proportion almost the same, and that is combined effect. When mass fraction in the range of 80%-88%, cohesion pretends as nonlinear growth with the increase of mass fraction, internal fraction angle and mass fraction presents S-type trend, shear strength increases with the increase of mass fraction and varies significantly when in the range of 82%-84%; at the same time, flow characteristics is mutation. 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.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Based on the distance discriminant analysis model of rockburst prediction, and combined the characteristics and the principle of Bayes discriminant analysis theory, a Bayes discriminant analysis method to predict rockburst in underground engineering is presented. Some main control factors of rockburst, such as the values of in-situ stresses, the compressive strength and tensile strength of rock, the elastic energy index of rock, are selected as the discriminant factors of the Bayes discriminant analysis model; and the resubstitution method is used to estimate the ratio of mistake-distinguish. The data of a series of underground rock projects at home and abroad are taken as the training and testing samples. Rockburst of three tunnels are used to verify this model. The results show that the Bayes discriminant analysis model of rockburst has excellent performance and high prediction accuracy. Source


Yang B.,Central South University | Luo Z.-Q.,Central South University | Liao J.-N.,Changsha Engineering and Research Institute of Nonferrous Metallurgy | Wu X.-Q.,Changsha Engineering and Research Institute of Nonferrous Metallurgy | Liu X.-M.,Central South University
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

Calculated the attribute valuation of the deposit model according to different cut-off grade, and formed 3D value model. By using the moving cone and L-G method, got a series preliminary optimization results. The time value implanted was into deposit mass model by arranging schedule, and calculated the annual cash flow of every scheme, then got NPV through discount, finally determined the best optimization scheme through comparing NPV. Taking a complex open pit mine as example, by using Surpac and Minesched, realized the dynamic optimization definition of final mining limit. The results show that static optimization scheme is unfeasible, and dynamic optimization scheme is in the ascendant in economic benefit aspect. Source

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