Sponsor(s): China Coal Society
12 issues per year
Current Issue: Issue 03, 2019
Journal of China Coal Society, the 1st in the field of mining engineering, promotes the development of coal theory and practice, as well as academic exchanges at home and abroad to accelerate the transformation from scientific research to real productive forces. It is supervised by China Association for Science and Technology and sponsored by China Coal Society. Launched in 1964, it aims at providing key topics of coal scientific research and mining development. Its scope covers coal geology, geochemistry, geophysics, mineralogy and coal seam formation and evolution; petrophysics of coal; organic matter-rich shales, including mineralogy, formation, transport and storage of gases in coal and shales; unconventional energy systems (e.g. oil shales, shale gas, and other carbon-based fuels); ore deposits of materials and rare metals in coal and coal-bearing strata; and groundwater management. The journal is included in CA, JST, EI, CSCD.
Fan Baoying, Xu Shengyang, Zhu Shuangcheng
Journal of China Coal Society,2019,Vol 44,No. 03
The stability of interburden water-resisting strata plays a significant role in the short-distance and multiple-seam mining. The accumulated water in the upper gobs can seep and flow into the lower mining space once the stability of interburden water-resisting strata is destroyed. In some situations, a sudden release of upper accumulated water occurs, which brings serious threats to the safe mining of lower coal seams. The basic concept of water-resisting control strata under the influence of multiple mining was proposed in this paper. The damage parameter ( D) calculation model of interburden was established based on theories of damage mechanics. The relationships between the damage parameters ( D) and the compressive strength/the damage range of interburden were analyzed, respectively. Then, the influence of multiple-mining damage on the stability of water-resisting control strata was investigated. The results showed that (1) the water-resisting control strata referred to the strata which did not break under the multiple mining influences and played a significant role in preventing the downward seepage and expansion of accumulated water in the upper gobs. (2) The damage parameter ( D) could be used to measure the failure range of interburden under multiple mining influences. (3) The relationship between the compressive strength ( R D) of the interburden and the damage parameter ( D) was that R Dof the interburden showed a linear decreasing trend with the increase in D. The reduction factor was 1- D. (4) The maximum failure depth/height ( Hmax) and the maximum distance to the working face ( Lmax) increased with the rise of the damage parameter ( D). The larger the damage parameter ( D) can lead to the greater increase ranges of Hmax and Lmax. (5) The stability of water-resisting control strata was closely related with the superimposed damage induced by the multiple mining. It was necessary to comprehensively evaluate the failure range of interburden under the multiple mining of upper and lower coal seams. The stability of water-resisting control strata under six different conditions was determined, and the reasonable control measures were then complemented to ensure the safety of lower coal-seam mining. The study on the influence of multi-mining damage on the stability of water-resisting control strata can provide a theoretical guidance for the safe mining of lower coal seams under water-accumulation areas.
Journal of China Coal Society,2019,Vol 44,No. 03
Yushenfu coal fieldborders on the Mu Us Desert and the Loess Plateau, where the ecological environment is fragile with scarity of water resources. The inhomogenous distribution of main aquifers and mine water inflow influence the safe production of coal mines. Water abundance of aquifers and mine water inflow have a significant difference in coal production. Thus, the comprehensive utilization of mine water resources and effective protection of aquifers are of great significance to coal production and ecological construction. After analyzing the distribution and water abundance of the main aquifers, such as Salawusu Formation, burnt rock and weathering bedrock, we combine the thickness of overlying bedrock of first-mined coal seam with the water inflow of mines, and the operating coal mines and unplanned areas could be divided into four types: areas of water scarcity, water richness, water abundance, and surface water source. The study area has been divided into sub-regions according to the classification and their distribution. Based on the classification, the concrete measures for water conservation and mine water utilization have been proposed such as storage and purification in goaf areas, industrial utilization, agricultural irrigation, wetlands construction, and artificial lakes. In the paper, the scientific content of water-preserved coal mining has been extended and interpreted as that both preserving shallow main aquifers and effectively utilizing coal mine water resources should be taken simultaneously. It is proposed that mining damage and ecological self-repair should be considered before coal mine construction. The idea of using economic benefits to improve the local ecosystem and green economy is raised to provide certain references for mining area planning and construction.