GROUP PATTERNS OF INTERLAYER-GLIDING STRUCTURES AND FAULTS AND DEFORMATION CONDITIONS IN COAL SEAMS OF THE HAIZI MINE, NORTHERN ANHUI
Ju Yiwen1, Hou Quanlin1, Jiang Bo2, Wang Guiliang2, Fang Aimin3
1. Graduate School, Chinese Academy of Sciences, Beijing 100049; 2. College of Mineral Resource and Geoscience, China University of Mining & Technology, Xuzhou, Jiangsu 221008; 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
In coal mines,faults and interlayer-gliding structures of coal seams are generally well developed, and formed varied group patterns. The study on faults and interlayer-gliding structures and its group patterns must play an important role in analyzing regional structural deformation history, in predicting occurrence regularity of coal seams in unexposed regions, in studying dissipative rheology of coal, in searching thick coal belts of gliding flow, in recognizing gas enrichmental regularity and in predicting coal and gas outburst. As a case study of the Haizi coal mine in northern Anhui, this paper, based on the site measured data, summarized the group patterns of faults and interlayer-gliding structures of No. 7, 8, 9 and 10 coal seams, and discussed their deformation mechanism. The results showed that, because of the disparity of stratigraphic associations of several coal seams and its tops and bottoms, tectonic deformations existed greater difference. Faults and interlayer-gliding structures had closely group relations. The formation was a result of tectonic stress fields of syn-phases. The Haizi coal mine area experienced several tectonic movement, so that the faults and interlayer-gliding structures there produced different groups, and specifically displayed three main patterns: contemporaneous expanding, forming mass movement and dissecting/limiting each other between faults and interlayer-gliding structures. Tectonic group patterns of coal seam depended on tectonic stress field, mechanical properties of rock of coal-bearing formation and surrounding environments.
Ju Yiwen,Hou Quanlin,Jiang Bo et al. GROUP PATTERNS OF INTERLAYER-GLIDING STRUCTURES AND FAULTS AND DEFORMATION CONDITIONS IN COAL SEAMS OF THE HAIZI MINE, NORTHERN ANHUI[J]. Chinese Journal of Geology, 2006, (1): 35-43.