为模拟大气边界层，实验段较长，实验模型放在实验段后部。为减小轴向静压梯度顶板高度分段可调。风速比航空凤洞低。
In order to simulate boundary layer in atmosphere, the length of first test section is longer than usual one, the models are put into the rear part.
得出了煤层倾角、水平分段高度对顶板变形的影响关系曲线，同时，给出了顶板破断的判据。
Relationship curves between seam dip Angle, horizontal section height and roof deformation are derived, at the seam time, the criterion of failure is given in this paper.
推导了根据钢板宽度确定锥体分段高度的计算公式，对锥体进行排料并推导出了排料所需钢板长度的计算公式。
The calculation formulae of the segmentation height of the conical transition according to the steel plate width were given, therefore , the length of the steel plate to be used can be calculated.
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