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Wu L.,Wuhan University of Science and Technology | Yu D.,Wuhan Iron and Steel Group Minerals Co. | Duan W.,Wuhan University of Science and Technology | Zhong D.,Wuhan University of Science and Technology
Advanced Materials Research | Year: 2012

In order to enhance smooth blasting adaptability and its effect in mining for rock mass complex characteristics, and based on the dynamic finite element analysis software with the material model of Mat-Plastic-Kinemetic, the dynamic stress characteristics and failure mechanism of blast-hole near-field with level soft interlayer are researched on different air-decked charge structures. The main effect of soft interlayer on top-air-decked charge structure is the tensile strength and range at the top of blasting hole, but the main effect of soft interlayer on middle-air-decked charge structure is the tensile strength and range at the middle of blasting hole, and some effect of soft interlayer on bottom-air-decked charge structure is the extension of rock crack at the bottom of blast-hole. Source


Cai P.,Central South University | Cai P.,Wuhan Iron and Steel Group Minerals Co. | Huang J.,Central South University | Zhang Z.,Central South University | Lu H.,Central South University
Analytical Methods | Year: 2013

In GC-MS-based metabolomic analysis of serum samples, differential sample handling and storage can induce systematic bias hiding the original metabolic state. Here, several sample sets were examined to characterize the effects of several potential sources of bias. These factors were the thawing temperature (4 °C and 25°C) and time (0.5-24 h) of the primary sample, storage temperature (4°C and 25°C) and time (0-48 h) of the nitrogen dried sample, storage temperature (4°C and 25°C), time (0-48 h) and refrigerating/warming cycle of the derivatized sample. The results showed that the primary sample thawed at both 4°C and 25°C for up to 24 h appeared to be stable. The storage of nitrogen dried samples and derivatized samples at 4°C for up to 48 h still provided useable samples. However, the nitrogen dried samples denatured after 24 h storage at 25°C. And the derivatized samples apparently changed after 10 h storage at 25°C, or after undergoing two refrigerating/warming cycles. © 2013 The Royal Society of Chemistry. Source


Qu H.Y.,Chinese Academy of Geological Sciences | Qu H.Y.,Nanjing University | Wang H.L.,Chinese Academy of Geological Sciences | Pei R.F.,Chinese Academy of Geological Sciences | And 3 more authors.
Acta Petrologica Sinica | Year: 2012

During the Late Mesozoic, extensive magmatism and associated ore deposits were developed in the Middle-Lower Yangtze River metallogenic belt, East China.As the Tieshan and Jinshandian quartz diorite in the southeastern Hubei Province examples, we performed in situ zircon U-Pb dating and Hf isotopic analyses on 5 samples. Twenty-six zircons in the quartz diorite from the Tieshan sample jlsl-110 yield excellent concordant results with a weighted mean 206Pb/238U age of 138.9 ±0.96Ma (n = 26, MSWD =0.82). Zircons from Tieshan sample jls3 yield excellent concordant results with a weighted mean 206 Pb/238 U age of 138.2 ±0.94Ma (n =24, MSWD =0.85). Zircons from Tieshan sample jls4 yield excellent concordant results with a weighted mean Pb/ U age of 131.0 ± 1.2Ma ( n = 11 , MSWD =0.94). Zircons from Tieshan sample jls5 yield excellent concordant results with a weighted mean 206Pb/238U age of 118.9 ± 1.2Ma ( n = 14, MSWD = 1.20) . Zircons from Jinshandian sample jsd yield excellent concordant results with a weighted mean 206Pb/238U age of 128.6 ±0.88Ma (n =22, MSWD =0.98). εHf(0) and εHf(t) values of the Tieshan quartz diorite are minus.Hf model age of the first stage (t DM1 ) is 1.33Ga and the age of the second stage (tDm ) is 2.03Ga. εHf(0) and εHf(t) values of the Jinshandina quartz diorite are minus.Hf model age of the first stage (tDM1 ) is 1.03 Ga and the age of the second stage (tDM2) is 1.56 Ga. Hf isotopic compositions from the Tieshan and Jinshandian quartz diorites show that maybe the curst-derived materials joined in the rock body forming supplement for the crust-derived magma of the Middle-Lower Yangtze River. Based on the datum of petrology, geochemistry and ore isotope ages, we can infer that the skarn type iron deposits of the Early Cretaceous in the southeastern Hubei Province formed on the environment of lithospheric extending and thinning. Source


Wu L.,Wuhan University of Science and Technology | Yu D.,Wuhan Iron and Steel Group Minerals Co. | Duan W.,Wuhan University of Science and Technology
Applied Mechanics and Materials | Year: 2012

In modern mining and project construction, how to make use of the explosion energy effectively is the key technology demanding prompt solution at present. The application of air-decked blasting technology has enabled the efficient use of explosion energy, which proves that the air-decked blasting technology can overcome many disadvantages caused by column charge effectively, getting ideal explosion effect. Based on the dynamic finite element analysis software with the material model of Mat-Plastic-Kinemetic, the dynamic stress characteristics and failure mechanism of blast-hole near-field with level soft interlayer are researched with different air-decked charge structures. There is significant effect on the rock at the middle of blast-hole if top-air-decked charge structure with indirect initiation and middle-air-decked charge structure with two ends initiation at the same time. If bottom-air-decked charge structure with indirect initiation, soft inter-layer don't change the peek of compression and tensile stress curves of typical elements with distance from the bottom of hole, so there is not effect significantly of level soft interlayer on bottom-air-decked charge structure with indirect initiation. © (2012) Trans Tech Publications. Source


Du J.,University of Science and Technology Beijing | Song W.,University of Science and Technology Beijing | Lei Y.,Wuhan Iron and Steel Group Minerals Co.
2011 International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2011 - Proceedings | Year: 2011

The paper is based on actual situation of Chengchao iron mine to study the pillar recovery schemes under challenging conditions. According to the three-dimensional ore body and adjacent rock model, rock mechanics test and analyses, a largescale physical and technical emulation model was built, after checked by the terrene monitoring data, and then it was used to study the different scheme. The surface displacement was disposed by ArcGis software, the result shows: the influence dimension of pillar exploit mainly in the left of the pillar and hanger surface, the filling method is effective to limit the ground deformation and maintained the shaft sites stability. The surface deformation of different mine level is phased grow, the impact of pillar extract to ground was shown after-360m level mine finished, particularly after-465m level exploited. The distortion grade of industry building caused by pillar mined is closely related to the distance to the pillar, the washing plan is the most dangerous. Fill mining method is the appropriate plan for the pillar recovery. © 2011 IEEE. Source

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