Zhai S.,Appraisal Center for Environment and Engineering |
Zhai S.,China University of Petroleum - Beijing |
Xiao H.,Wuhan University |
Zhao Z.,Shandong Gold Mining Co.
Chinese Journal of Geochemistry | Year: 2013
This article gives a review on heavy metal pollution prevention and control, and it also discusses heavy metal pollutant discharge, prediction and evaluation of environmental impact, and pollution prevention and monitoring. © 2013 Science Press, Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg.
Lan T.,CAS Institute of Geology and Geophysics |
Fan H.,CAS Institute of Geology and Geophysics |
Hu F.,CAS Institute of Geology and Geophysics |
Jang K.,CAS Institute of Geology and Geophysics |
And 2 more authors.
Acta Petrologica Sinica | Year: 2012
Changyi iron deposit, located at Jiaobei terrane, eastern North China Craton (NCC), is a banded iron formation (BIF) deposit kept in Paleoproterozoic Fenzishan Group. Ore bodies of the deposit are lens- or layer-like and mainly composed of amphibolitebearing magnetite quartzite, which have expericed <636°C amphibolite facies metamorphism. Major contents of SiO2 and Fe2O3 T(SiO2 + Fe 2O3 T =82.5% -97.7%) coupled with minor Al 2O3, MgO and CaO suggest that the ores originated from chemical deposition contaminated by clasitic or pelitic materials. LREE depletion, high Y/Ho ratios and positive La and Y anomalies indicate a marine environment. In addition, high Ti/V ratios, high Cr, Co and Ni concentrations as well as positive Eu anomalies suggest involvement of high-temperature hydrothermal fluids, implying ore-forming elements were related to submarine volcanic activities. The lack of negative Ce anomalies also suggests an anoxic environment. Compared with Archean BIFs of NCC, the higher Al2O 3, MgO, CaO and K2O contents as well as weaker positive Eu anomalies indicate that the Paleoproterozoic Changyi BIF deposit obtained more clastic or pelitic materials and less hydrothermal fluids in a shallower marine environment.
Zhou Y.,University of Science and Technology Beijing |
Wu S.C.,University of Science and Technology Beijing |
Wang X.Q.,Hebei University of Technology |
Ding J.F.,Shandong Gold Mining Co.
Rock Mechanics: Achievements and Ambitions - Proceedings of the 2nd ISRM International Young Scholars' Symposium on Rock Mechanics | Year: 2012
Particle Flow method is widely applied in meso mechanical research field. Codes such as PFC 3D program generate calculation model with particles. Meso-scale mechanical parameters can only be obtained by varying them until the macro mechanical parameters of the numerical sample match that of the laboratory rock-soil mass sample. The corresponding parameters maybe then used in asimulation of problem containing the same solid material as the sample. Based on PFC 3D program, a nonlinear network model linked macro mechanical parameters and meso-scale mechanical parameters is founded by adopting BP neural network, so meso-scale mechanical parameters can be inversed rapidly and accurately by inputting macro mechanical parameters. Some studying results are drawn as follows: (1) Precision of macro mechanical parameters calculated by inversed results is generally over 90%; (2) Inversion performance of BP neural network model is best when Resolution(RES) equals 10 and the hidden layer has six neurons. © 2012 Taylor & Francis Group.
Li G.,University of Science and Technology Beijing |
Hu N.,University of Science and Technology Beijing |
Chen Y.,Shandong Gold Mining Co. |
Xiu G.,Shandong Gold Mining Co.
ICMHPC - 2010 International Conference on Mine Hazards Prevention and Control | Year: 2010
The components of safety management for underground metal mines were summarized according to the requirements of safety production, which include the safety of environment states, personnel behaviors, and equipment operations as well as the safety guarantee system. Therefore, a framework of integrated management of production safety for underground metal mines was built up based on the technology of Geographical Information System (GIS). Several drawings, such as the vertical projection drawing of stopes, the plan of levels, and the layout plan of production system were selected as base maps, so that the function system of the production safety management was figured out by taking the stopes, excavation faces, and key equipment as basic unit respectively. Both the distributed collection and integrated demonstration of the production safety information are available in the system. © Atlantis Press, 2010.
Wang R.-J.,Shandong Gold Mining Co. |
Wang C.-Z.,Shandong Gold Mining Co. |
Liu H.-L.,Shandong Gold Mining Co. |
Liu H.-L.,Northeastern University China |
And 2 more authors.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015
As the failure of rock is a size-invariant process, the study of acoustic emission in the failure process of rock sample can enhance the understanding of the engineering rock mass instability process. The characteristics of rock acoustic emission activity in uniaxial compression were discussed and the condition of “acoustic emission quiet period phenomenon” before rock failure was intensively researched. According to the comparative analysis of “silence zone” in acoustic emission monitoring results during the rock failure process, it is concluded that the variation of the acoustic emission characteristics and the stress state during rock process should be thoroughly investigated when monitoring the stability of underground engineering rock mass. Thus it is possible to accurately identify the precursory phenomena of rock mass failure, and make a forecast of geological disasters effectively. ©, 2015, Northeastern University. All right reserved.