中文摘要：

现代构造应力场最大主应力方向不仅是影响煤矿巷道稳定性的主要因素,也是煤层瓦斯抽采钻孔优化设计依据的重要参数。运用FLAC~（3D）有限差分数值模拟方法,分析了不同侧压系数下巷道塑性区分布规律,揭示了巷道变形破坏特征与原岩应力场的密切相关性,提出了通过观测多条巷道变形破坏特征综合判定煤矿现代构造应力场最大主应力方向的方法。古汉山煤矿实际应用表明,该方法简单实用,预测结果可靠,具有现行应力测量技术无法替代的优点。

英文摘要：

The given article is aimed at introducing a renovated method for judging the maximum principal stress direction of the existing tectonic stress field in coal mining. For this purpose,we have done a series of three-dimensional stress analyses of a Uform roadway by using a computer software named FLAC3 Dfinite difference numerical simulation in hoping to determine the relationship between the features of deformation and faults with the coal mine roadway and the various lateral pressure coefficients.The simulation results indicate that the direction of the maximum principal stress tends to have a significant effect on the stability ofthe surrounding rocks. For example,with the increase of different lateral pressure coefficients,the plastic zone of the actual roadway tends to move from the two sides to the roof and the wall face.Based on the analysis of the said result,it can be concluded that the direction of the maximum principal stress in current tectonic stress field is perpendicular in shape to the direction in which the most probable part of the roof falls tends to occur. While considering the practical engineering needs,we have worked out a novel method for judging the direction of the maximum principal stress,in accordance with which we have made clear of the spatial relation of the three kinds of principal stresses via the analysis of the deformation and failure features of the main roadway,and determined the direction of the maximum principal stress according to the direction in which the most likely roof fall accidents may occur. What is more,the method proposed by us has already been applied to a case study sample in Guhanshan coalmine with the results showing that the said mine is under the action of the current tectonic stress. The maximum principal stress axes of the present stress field proves to be close to the horizontal the direction of the maximum principal stress in a N60° W direction,and that the general feature of the current tectonic stress field tends to be： σH 〉σv 〉σh. In addition,