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地质科学  2004, Vol. Issue (1): 50-62,91    DOI:
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层滑构造煤岩体微观特征及其应力应变分析
琚宜文, 姜波, 王桂梁, 胡超
中国矿业大学资源与地球科学学院, 江苏徐州, 221008
CHARACTERISTICS OF MICROCOSM OF INTERLAYER-GLIDING TECTONIC COAL-TECTONITE AND THEIR STRESS-FINITE STRAIN ANALYSES
Ju Yiwen, Jiang Bo, Wang Guiliang, Hu Chao
College of Mineral Resource and Geosicence, China University of Mining and Technology, Xuzhou, Jiangsu 221008
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摘要 层滑构造在煤层及其顶、底板间普遍发育,它对地质勘探、煤矿生产、矿井工程灾害防治以及煤层气的开发等方面都有着重要影响。本文以淮北煤田海孜煤矿为例,在研究宏观层滑构造带组合特征的基础上,探讨了层滑构造的微观特征和形成机理。构造煤是层滑引起的煤层流变最显著的特征之一。通过对构造煤与构造岩的微观特征测试,发现层滑运动除了产生脆性变形外,还产生较强烈的塑性变形。利用煤镜质组光率体各向异性和构造岩组构,结合层滑构造的实测数据进行了煤岩体应力、有限应变分析。结果表明:层滑构造以顺层剪切为主,煤层受力的主要方向为NW-SE向。
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琚宜文
姜波
王桂梁
胡超
关键词层滑构造   构造煤   构造岩   微观特征   应力应变     
Abstract: The layer-slip structures are developed widely between the coal seams and its tops and bottoms,which have important influences on coal geology and exploration,coal mine production,disaster prevention and cure of mine engineering and the development of coal seams gas.Taking the Haizi coal mine as an example,the paper studied the characteristics of microcosm and deformation mechanism of layer-slip structures.The macroscopic forms of layer-slip structures showed different kinds of layer-slip structural groups,such as interlayer folds,imbricate faults and step faults.Rheology of coal seams caused by interlayer-gliding formed changes of the coal shape,thickness and stucture and moreover,formed various kinds of tectonic coal.Tectonic coal was one of the most striking characteristics of rheology of coal seams.The microstructures of several coals,displayed mainly brittle deformation by bedding,and plastic deformation structures,for example,microfolding,were also developed highly.The layer-slip structures often occurred tectonite when coal seam tops and bottoms being either sandstone or mudstone resulted in interlayer clastic sandstone or layer-slip gauges.The microcosm test revealed that interlayer clastic sandstone formed tensional crack,shear crack,and its superimposed deformation being observed.Quartz particles existed intergranular movement,undulatory extinction,deformation zone,deformation lamination L黡ers lines and hourglass structure of intragranular.The interlayer clastic sandstone had more stronger strain degree.Interlayer gliding produced not only brittle deformation but also intencer plastic one.Using the vitrinite reflectance anisotropy of coal,and combining with the measuring data,stress and finite strain analysis was made for tectonic coal and tectonite.It was suggested that the rheological mechanism of coal seams might be mainly shearing,and there appeared two kinds of faults: transtension and transcompression ones.Tectonic activities in the Haizi coal mine experienced multiple phases,shown by the characteristics of firstly transcompression and secondly transtension,but the dominant direction of the force acting on coal seams should be from NW to SE,consistent with the NW-SE direction of thickening and thinning of coal seams due to their rheology.The tectonite fabric analysis indicated interlayer-gliding tectonite occurred structure movement of multi-phase,reflecting transcompression deformation as a whole.
Key wordsLayer-slip structures   Tectonic coal   Tectonite   The characteristics of microcosm   Stress and strain   
收稿日期: 2002-04-03;
基金资助:国家自然科学基金项目(编号:40172058);教育部骨干教师资助项目部分成果。
引用本文:   
琚宜文,姜波,王桂梁等. 2004, 层滑构造煤岩体微观特征及其应力应变分析. 地质科学, (1): 50-62,91.
Ju Yiwen,Jiang Bo,Wang Guiliang et al. CHARACTERISTICS OF MICROCOSM OF INTERLAYER-GLIDING TECTONIC COAL-TECTONITE AND THEIR STRESS-FINITE STRAIN ANALYSES[J]. Chinese Journal of Geology, 2004, (1): 50-62,91.
 
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