中文摘要：

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。

英文摘要：

Based on the study of the up-to-date research results both at home and abroad,the paper has proposed the prediction of the advantageous development direction and linear frequency trajectory calculation of the coal-bed fractures. As is known,the development of fractures is non-uniformed and directional in the coal seam,which is helpful to predict the advantageous excavation orientation and linear frequency of fractures in the coal seam,for they are favorable for the efficient improvement of the gas extraction and the optimal layout of the CBM wells. It is also because of the coal cleat direction and reticular structure that is determined by the particular features and the intensity of the tectonic stress fields in the coal evolutionary process. Our study results have disclosed the consistency in the average trend of the regional linear landform and seam cutting edge orientation. Since the advantageous orientation of the coal bed fractures is parallel or vertical to the fold structure hinge,and parallel or oblique to the trace of the fault,it can be predicted that there exists a close relationship between the advantageous development orientation of the coal bed fractures,the tectonic stress field and the macroscopic geological lineaments,which are feasible and practical for us to take the advantage of such relations for the prediction of the coal bed fractures. The paper has also introduced a new approach to observing the fractures of the working faces of the coalmine based on the measuring line and through the observation window. And the power and utility of the method can be used as an example of a field application,whose results indicate that the advantageous development orientation of the coal seam fractures should be taken in a direction of NE40 °-70 °,with an average density being2. 1 fractures / m in the area under experiment. In the process of coal mining excavation,a preliminary forecast can be done in the advantageous developmental orientation of the coal bed fractures by combining the macro linear land