In Vietnam, the most precious type of coal is anthracite, which is found in the Quang Ninh province. Industrial anthracite deposits are estimated to be... PMV Nguyen,M Rotkegel,HD Van - 《Archives of Mining Sciences》 被引量: 0发表: 2020年 Source rock potential assessment of the Paleocene...
"The majority of REE deposits outside of China are associated with 'conventional' mines and found in igneous hard rock deposits, which makes them both difficult and expensive to mine and process," Ramaco said. "In contrast, the REEs from the Brook Mine are characterized as "unconventional" b...
Although the induced charge monitoring method has developed in the application of roadway surrounding rock stability, the relationship between the damage of coal medium and the time–frequency features of induced charge signals is still unclear to establish, which results in the poor effect of evaluati...
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This paper investigates the abutment pressure distribution in coal mines with extremely thick alluvium stratum (ETAS), which is a typical kind of mines enc... S Zhu,Y Feng,F Jiang - 《Rock Mechanics & Rock Engineering》 被引量: 4发表: 2016年 The Mechanisms and Consequences of Strong Mining...
in coal seam roof is found.The following results have been drawn.(1) Because of the excavation of coal,the pressure variation of coal pillar is ... D Liu,Z Jiang,LI Jianshuo,... - 《Chinese Journal of Rock Mechanics & Engineering》 被引量: 6发表: 2009年 Research on Rapid Excavation...
A coal damage constitutive model considering the temperature effect and a coal permeability model incorporating the thermal damage in the complete stress-strain process was developed. It is found that results from the coal damage model and the proposed coal permeability model agree well with the ...
which is convenient for effectively revealing the details of crack evolution during coal and rock damage34. The specific equipment parameters are shown in Table2. In addition, the perimeter of the coal and rock specimens was surrounded by a high-transmittance acrylic plate, which prevents splashing...
In this article, a coal price time series forecasting model that considers some amount of redundancy is proposed, which combines an improved sparrow search algorithm (ISSA) and a least squares support vector regression machine regression (LSSVR) algorithm. The optimal values of the penalty factor ...