The lag distance of abutment pressure behind working face increases, but the convergence coefficient of vertical stress doesn't change obviously with the increase of mining height.

分层开采与综放开采工作面滞后支承压力变化规律是，随着采高的增大，工作面滞后支承力的距离加大，垂直应力集中系数差别不大。

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It is found that the maximum concentration often occurs near source through intensive vertical diffusion, and the values of concentration decrease with the distance downwind rather rapidly.

发现由于垂直扩散较强，最大浓度常于近源处发生，且向下风方浓度衰减较快。

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Its characteristics include that the counter force is proportional with the horizontal distance of a vertical line where BHA is offset from an open hole.

新的纠斜控制方法以减小测量点与开孔点垂线间的水平距离为目标，可以提高垂钻轨迹的垂直精度。

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