Dr. Jianguo Wang Profile

Dr. Jianguo Wang

at Qinghai Univ

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Proceedings Article | 23 December 2021 Paper

Study on outburst sensitive indexes of No.3 coal seam in Xinjing mine

Jianguo Wang

Proceedings Volume 12058, 120583J (2021) https://doi.org/10.1117/12.2620049

KEYWORDS: Mining, Land mines, Inflammation, Statistical analysis, Safety, Geology

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Coal and gas often extrude when excavating the No.3 coal seam in Xinjing mine, the impact indexes can be summarized as follows: geological structure, coal block texture, burial depth, gas pressure, gas content, coefficient of coal seam sturdiness, initial velocity of gas emission and comprehensive indexes. On the basis of field observation, testing qualitative and quantitative methods, it found that impact indexes include interlayer micro-slide, closely spaced joint, minor faults, coal seam epigenetic scour, coal seam fold, etc. The geological structure is decisive indicators. No.3 coal seam belongs to Ⅲ class, Ⅳ class, class deformation coal, and coal block texture is decisive indicators. The critical value of burial depth is 400(meter). By analyzing the gas pressure of No.3 coal seam, the result shows that the minimal critical value of gas pressure is 0.74. The gas content could be gained through calculation formula, taking minimum 0.33 as the critical value of coal seam sturdiness coefficient, and the maximum 10.20 as initial velocity of gas emission. The No.3 coal seam belongs to anthracite, the comprehensive indexes are D(0.25) and K(20). Therefore, it suggested that study of outburst sensitive indexes will contribute to outburst prediction and treatment measures selection of coal and gas outburst.

Proceedings Article | 8 December 2020 Paper

The occurrence characteristics of Be element and analysis of Be ores resistivity: taking the Shaliuquan Be (Nb, Ta) deposits as an example

Jianguo Wang

Proceedings Volume 11606, 116061F (2020) https://doi.org/10.1117/12.2586302

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Be element belongs to pro-rock elements, its chemical properties is very active. The ore samples in this study were collected in the Saliuquan Be (Nb, Ta) deposits, which is located in the Oulongbuluke - Wulan wolfram (iron, bismuth, rare earths, precious jade) metallogenic belt. The ore samples belong to granites of magmatic rocks, minerals are mainly composed of potassium feldspar, plagioclase, quartz and a small amount of biotite, followed by a small amount of metal minerals. For the convenience of analyzing the resistivity characteristics of ores, some points are randomly selected on the same sample for resistivity test, the test temperature of the samples is 20 ℃. The results showed that the resistivity of ores is negatively correlated with the content of Be element, which indicates that the influence of metal elements content (conductive minerals) on the resistivity of ores is obvious. As far as the resistivity of Be ore is concerned, the higher the component of conductive minerals, the smaller the resistivity, which has obvious characteristics of low resistance and high conductivity. Therefore, the minerals composition and resistivity parameter characteristics of Shaliuquan Be (Nb, Ta) deposits is carried out, and the coupling mechanism of rock resistivity is further revealed, it is beneficial to the technical methods and theoretical development of cross - disciplines and metallogenic predicting.

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