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Brief

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.
Editorial Board

Editor-in-Chief
Liu Feng

Associate Editor
Fan Baoying, Xu Shengyang, Zhu Shuangcheng

Influence of multiple mining damage on the stability of water-resisting control strata

FENG Guorui;BAI Jinwen;YANG Wenbo;WANG Shanyong;KANG Lixun

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.

Abundance of aquifers in Yushenfu coal field and measures for water-preserved coal mining

HOU Enke;CHE Xiaoyang;FENG Jie;DUAN Zhonghui;GAO Lijun;LI Jun

Journal of China Coal Society,2019,Vol 44,No. 03