Gas drainage and utilization in coal mines in China: History, technological advances, and prospects by Guofu LI, Chao LI, Bichuan ZHANG, Yun XU, Zheng WANG, Xianjun ZHOU

“…In combination with the differences in geological conditions of gas in varying mining areas, three typical gas drainage modes have been formed: the surface-underground combined gas drainage mode through “four-zone linkage” in the Jincheng mining area in Shanxi Province (the new Jincheng mode), the protective layer mining mode for broken-soft and low-permeability coal seams in the Huainan-Huaibei area in Anhui Province (the Huainan-Huaibei mode), and the hydraulically enhanced permeability mode of the Songzao mining area in Chongqing City (the Songzao mode). …”
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Spatiotemporal evolutionary patterns of the hydrochemistry of Jurassic conglomerate aquifers under the influence of curtain walls by Luwang CHEN, Minghui WU, Xiaowei HOU, Yongsheng HU, Miao ZHANG, Xinyue CAI, Xiaoxi YIN, Xiaoping SHI

“…MethodsThis study investigated the Jurassic conglomerate aquifers in the Zhuxianzhuang Coal Mine, Huaibei coal field. Based on the statistics of conventional hydrochemical composition, Piper diagrams, ion combination proportions, and principal component analysis (PCA), this study explored the impacts of curtain walls on the hydrochemistry of the aquifers and determined the spatiotemporal hydrochemical evolutionary patterns under the influence of the curtain walls. …”
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