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Li L.,Shandong University | Li L.,Key Laboratory of Coal Resources Exploration and Comprehensive Utilization | Li L.,Ocean University of China | Lei T.,Shandong University | And 5 more authors.
Arabian Journal of Geosciences | Year: 2015

Water inrush makes time extended, instruments destructed, and casualty increased, which is the biggest threat for safe construction of tunnels in karst areas. A software system for risk assessment of water inrush was established with considering eight risk factors, including groundwater level, unfavorable geology, formation lithology, topography, strata inclination, excavation, advanced geological prediction, and monitoring. In the present software system, fuzzy mathematics and Analytical Hierarchy Process (AHP) were used to quantitatively describe the risk levels for each factor. The influence degree of each factor to water inrush was assigned an objective weight and a subjective weight, and the proportion of the two weights in the risk assessment was defined as weight distribution. The objective weights of the risk factors were obtained from more than 100 water inrush instances in karst tunnels, whereas the weight distribution was totally derived from expert field assessment and subjective weights were determined by using AHP in the risk assessment. Two case studies of karst tunnels were applied to check the reliability of the proposed software system, and the comparisons between the software assessment and practical excavation yield good consistency. Therefore, the software system can appropriately be used in practice to forecast water inrush in karst tunnels. © 2014, Saudi Society for Geosciences. Source


Chen W.-Y.,CAS Institute of Geology and Geophysics | Xue G.-Q.,CAS Institute of Geology and Geophysics | Xue G.-Q.,Key Laboratory of Coal Resources Exploration and Comprehensive Utilization | Cui J.-W.,CAS Institute of Geology and Geophysics | Zhong H.-S.,CAS Institute of Geology and Geophysics
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2016

SOTEM is a kind of time domain electromagnetic method with great detecting depth and high resolution. In order to further understand and promote this method, studies on its distribution of electromagnetic field response and diffusion characteristics was conducted in this paper. Calculation results based on the 1D forwarding theory of SOTEM indicate that grounded wire source can excite both horizontal and vertical induced current under ground. The horizontal current includes upper and lower parts (also called return current). The maximum of horizontal induced current mainly focus on the area close to the source and diffuses downward vertically. The maximum of vertical induced current diffuses along the direction of 45 degrees with the ground surface with a weaker amplitude and faster speed than horizontal induced current. All the six EM components have the ability for geophysical detection. However, in consideration of the diffusion characteristics of each component and observation convenience, vertical magnetic component Hz (■B/■t) and horizontal electric component Ex are the mostly used in practical. Magnetic component (Hz) is more sensitive to low resistance body and it mainly focuses on the region close to equator area. Electric component (Ex) shows same sensitivity to both low and high resistance body, while low resistance sensitive area mainly focuses on the region close to equator and high resistance sensitive mainly focuses on axial region, and the distance between sensitive region and source is depended on the buried depth of targets and resistivity of overburden. © 2016, Science Press. All right reserved. Source


Zhen L.,University of Science and Technology of China | Zhen L.,Key Laboratory of Coal Resources Exploration and Comprehensive Utilization | Chao Y.,University of Science and Technology of China
BioTechnology: An Indian Journal | Year: 2014

Given that the traditional teaching model can no longer adapt to the current talent training program of the mineral processing industry, this paper proposes a professional teaching platform in the form of the "Trinity" teaching platform, which is the systematic training model of "theoretical teaching platform-experimental teaching platform-outside-school practice platform". Through several years of exploration and practice, this teaching system has been proved to successfully broaden students' knowledge under the premise of establishing a strong theoretical basis. Moreover, over 85% of high quality experimental teaching resources have been made accessible to undergraduates, and such an approach has effectively promoted the expansion of teaching practice from the experimental center towards the teaching internship base and scientific research base. As a result, students' innovative capabilities, such as a cognition ability of basic theories, experimental skills, practice techniques, field experience and comprehensive quality, have all been greatly enhanced. Furthermore, such an approach has provided a vast space for the cultivation of applied talents in the mineral processing field and multi-level innovative talents in general. © Trade Science Inc. Source


Zhen L.,University of Science and Technology of China | Zhen L.,Key Laboratory of Coal Resources Exploration and Comprehensive Utilization | Chao Y.,University of Science and Technology of China
BioTechnology: An Indian Journal | Year: 2014

To improve the quality and enhance the ability of students as mineral processing professionals, especially given the current ineffective teaching methods for the course of "Design of the Coal Preparation Plant", an education reform model that emphasizes the development of students' technological innovation and engineering practice ability is proposed in this paper. This model consists of the creation of an open learning environment, which is the basis, the training of students' engineering design capability, which is the breakthrough, and the integration of theoretical teaching with production practice, which is the core. Furthermore, the authors have striven to provide some new ideas for full-featured teaching styles of universities and colleges, and for the development and improvement of the innovative training model. © Trade Science Inc. Source


Yang F.,Key Laboratory of Coal Resources Exploration and Comprehensive Utilization | Yang F.,Shaanxi Coal Geology Group Co. | Chen G.,Northwest University, China
Arabian Journal of Geosciences | Year: 2016

Junggar basin is an important part of the Central Asian Orogenic Belt (CAOB) which is also one of the key areas of researches about formation and evolution of the CAOB. Recently, a question of whether the Junggar basin has a Precambrian basement is one of the hottest topics. We undertook LA-ICP-MS zircon U–Pb dating from Carboniferous pyroclastic rocks and Mesozoic sedimentary rocks in northern Xinjiang Province, NW China, with the aim of constraining the evolution and features of the basement of the north Junggar basin and adjacent areas. (1) The zircon U–Pb age analysis of the Carboniferous pyroclastic rock samples clustered in the 1447∼1410 Ma and 885∼559 Ma showed that the basement of the north Junggar basin was continental crust that formed 1.4 Ga ago. The zircon U–Pb ages clustered in the 536∼420 Ma, 401∼360 Ma, and 359∼303 Ma indicated a multiple evolution of basement. (2) The zircon trace element analysis of different age groups from the Carboniferous pyroclastic rock samples showed that the basement of the north Junggar basin was continental crust composed of acid rocks and intermediate-basic intrusive rocks, which were mainly the granitoids, syenite, basalt, dolerite, and larvikite. (3) The zircon U–Pb ages and trace element analysis of the Mesozoic sedimentary rock samples clustered in the 3022∼2102 Ma, 1747∼1202 Ma, 996∼915 Ma, 885∼544 Ma, 539∼420 Ma, 419∼356 Ma, and 354∼300 Ma revealed that not only 3.0-Ga continental crust existed in the north Junggar basin and adjacent areas but also multiple crustal material evolution that occurred during the formation of the basement. (4) The evolution of sedimentary cover experienced 299∼250 Ma, 210∼176 Ma, 175∼148 Ma, and 147∼132 Ma with the corresponding peak age of ca. 290, 180, 163, and 140 Ma, respectively, indicated that the sedimentary cover of the northern Junggar basin experienced a complex tectonic evolution from Permian. © 2016, Saudi Society for Geosciences. Source

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