为了最大限度进行煤层开采并控制其对斜井结构的不利影响，需要估算合理的斜井保护煤柱尺寸。针对地层-斜井的5个不同横截面，采用经验公式法估算煤柱尺寸，并进行二维离散元数值模拟，分析斜井管片结构内力和位移的分布特征，并给出合理的煤柱尺寸。主要结论如下： 1）根据二维离散元数值模拟得到的煤柱尺寸小于根据经验公式得到的煤柱尺寸；2）随着回采工作面与斜井水平距离的减小，斜井结构首先轻微上浮，然后显著下沉；3）当斜井与开采煤层的竖向距离较小时，斜井结构因受到破裂岩层的下沉挤压作用而向远离开采工作面的方向变位；4）当斜井与开采煤层的竖向距离足够大时，斜井向开采工作面的方向变位；5）由于斜井穿越的岩层与煤层物理力学性质的差异，在不同岩层或煤层之间的交界面附近，斜井结构可能因应力集中而承载力不足，需要采取一定的改善与控制措施。

In order to minimize the influence of coal mining on inclined shaft structures, the rational dimensions of protective coal pillar have to be calculated. The coal pillar dimensions are calculated by empirical formula method, 2D discrete element model is established, the distributions of internal force and displacement of segment of inclined shaft are analyzed, and rational dimensions of protective coal pillar are given by considering 5 different crosssections of groundinclined shafts. Some conclusions are drawn as follows: 1) The coal pillar dimensions calculated by discrete element model are smaller than that calculated by empirical formulas. 2) The inclined shaft structure uplifts a little and then sinks obviously with the vertical distance between coal mining working face and inclined shafts decrease. 3) The inclined shaft displaces away from coal mining working face as a result of the sagging pressure from the overlying broken rock layers when the vertical distance between coal mining working face and inclined shafts is comparative small. 4) The inclined shaft structure displaces towards coal mining working face when the vertical distance between the coal mining working face and inclined shafts is large enough. 5) The bearing capacity of inclined shaft structure might become insufficient due to stress concentration at the interfaces of rock and coal layers with distinctively different physicomechanical properties; thus the improvement and control methods are necessary.