以托板理论、弹塑性力学中的薄板弯曲小挠度理论为基础，编程计算了爆破矿柱后顶板悬露面积的临界值。
On the basis of SLATE theory and elastic and plastic mechanics theory, the critical area of SLATE is obtained by computer calculation.
并运用相关的力学理论，分析置换开采后顶板的运动和变形特征，得出基本顶不会破断，地表变形没有超过建筑物允许变形范围。
By using the mechanics theory to analyze the character of roof moving and deformation after coal mining, the conclusion is gotten that the basic roof will not fail.
当立柱升起后顶梁贴紧顶板，提升千斤就能提起或放下综采设备。
When vertical column is lifted, the roof beam is closely near top plate, the integrated mining equipment can be lifted or laid down by the hoisting jack.
当立柱升起后顶梁贴紧顶板，提升千斤就能提起或放下综采设备。
When vertical column is lifted, the roof beam is closely near top plate, the integrated mining equipment can be lifted or laid down by the hoisting jack.
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