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Liu Z.-S.,Northern Engineering & Technology Corporation | Xu S.-D.,Northeastern University China | Cheng C.-Q.,Northern Engineering & Technology Corporation | Xu H.-L.,Northern Engineering & Technology Corporation | Li Y.-H.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

Blasting vibration monitoring was used to study frequency band energy and peak particle velocity of medium-length hole blasting in Hongtoushan Copper Mine. The results show that horizontal energy band of blasting vibration wave converges to 19~39 Hz, the maximum peak particle vibration velocity band closes to 19~78 Hz, and thus the vibration wave lying in this frequency range should be avoided to destroy the tunnels. With propagation distance increasing, the percentage of the frequency band energy which reflects the blasting test location features increases and the accompanied energy band becomes narrower. After a certain distance, frequency band energy is relatively concentrated in Hongtoushan Copper Mine with the possible reason of the diversification of surrounding rock features in shallow blasting test location. ©, 2015, Northeastern University. All right reserved. Source


Liu J.-P.,Northeastern University China | Liu Z.-S.,Northern Engineering & Technology Corporation | Wang S.-Q.,Northern Engineering & Technology Corporation | Li Y.-H.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

Acoustic emission (AE) technique was employed to measure the AE signals of granite for three-point bending tests and shear tests. The spatial-temporal distributions of various fractures micro-cracks were studied based on the simplex locating algorithm and moment tensor theory. The results showed that the micro-cracks generated from the three-point bending tests are mainly of tensile type, accounting for more than 50% of the total events. For the shear tests, the micro-cracks of shear type are prominent whose proportion is more than 60% with rock failure. Moreover, the results of the distribution of AE locations and moment tensors are in agreement with the macroscopic fractures at the end of the experiments, which can be used to describe the distribution and migration of tensile and shear stress when rocks are under loading. The results indicated that the moment tensor theory is a very useful method for studying AE source mechanisms and spatial-temporal vibrations of micro-cracks. © 2015, Northeastern University. All right reserved. Source


Jing H.-D.,Northeastern University China | Li Y.-H.,Northeastern University China | Zhang Z.-H.,Northeastern University China | Zhang Z.-H.,Shandong Gold Group Co. | Liu Z.-S.,Northern Engineering & Technology Corporation
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

Based on 3D laser scanning technology and geological analysis, an experiment was conducted to study the information extracted from structural plane in underground mining engineering. Z+Flasercontrol and Geomagic Studio were used to preprocess the cloud information of surround rock point. A point cloud data processing system was developed by Java language, and the Dips software is used to analyze the information of structural planes. The accuracy and feasibility of this system were validated against the manual measurements. It is shown that this method provides advantages in terms of fast, automatic and distant measurement, compared with the traditional method. ©, 2015, Northeastern University. All right reserved. Source

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