Northern Engineering & Technology Corporation

Dalian, China

Northern Engineering & Technology Corporation

Dalian, China
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Wang S.,CAS Wuhan Institute of Rock and Soil Mechanics | Li X.-C.,CAS Wuhan Institute of Rock and Soil Mechanics | Shi L.,CAS Wuhan Institute of Rock and Soil Mechanics | Liu Z.-S.,Northern Engineering & Technology Corporation
Yantu Lixue/Rock and Soil Mechanics | Year: 2016

The material point method (MPM) is applicable to simulate large deformation of continuous medium, such as slope failure process. The strength reduction method (RSM) is applied to material point method for evaluating slope stability. In a slope stability evaluation example, the safety factor and slip surface position are got respectively by limit equilibrium method (LEM), finite element strength reduction method (FEM-RSM) and material point strength reduction method (MPM-RSM). Compared with LEM, the caculated results of safety factor value and slip surface position by MPM-RSM are basically the same with LEM and FEM-RSM. Compared with FEM-RSM, the physical meaning of MPM-RSM's failure evaluation criterion is more clear. Taking advantage of its superiority in calculating large deformation, MPM-RSM can evaluate the consequences after slope failure. A case study shows its performance in evaluating debris shape and sliding distance for different safety factors, especially the advantage in estimating the impact degree of landslide on adjacent buildings. MPM can be used for the evaluation of slope stability and evaluation of slope failure consequence. © 2016, Science Press. All right reserved.


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.


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.


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.

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