论文部分内容阅读
裂隙在煤层中的发育具有不均匀性和方向性,确定煤层裂隙优势发育方位和线频率,有助于提高矿井煤层瓦斯抽采效率。根据国内外研究成果,分析了煤层裂隙优势发育方位与同期古构造应力场、现今构造应力场、宏观线形地貌和线形构造要素的密切关系,提出了利用这些规律进行煤层裂隙优势发育方位预测的可行性;根据煤矿井下采掘工程特点,基于测线法与观测窗法相结合,提出了煤矿采煤工作面煤壁节理裂隙观测方法,应用该方法预测出试验区域煤层节理裂隙优势发育方位沿NE40°~70°方向,平均线密度为2.1条/m。
The development of fractures in the coal seam has inhomogeneity and directionality, and the dominant azimuth and line frequency of fractures in the coal seam are determined, which helps to improve the gas drainage efficiency in the coal seam. According to the research results at home and abroad, the close relationship between the dominant position of coal seam fractures and the palaeostructure stress field, the present tectonic stress field, the macroscopic linear topography and the linear structural elements are analyzed. It is feasible to use these rules to predict the predominant direction of coal seam fissures. Based on the characteristics of coal mine underground excavation project, based on the combination of survey line method and observation window method, a coal seam joint fissure observation method for coal mining face is proposed. By using this method, the predominant development orientation of joint fissures in coal seam along the NE40 ° ~ 70 ° direction, the average linear density of 2.1 / m.