【摘要】 应用ＰＢ－７００计算机设计在煤层产状变化条件下地面建筑物保护煤柱．着重叙述：沿煤层下山方向岩层移动角β的确定方法；煤层底板等高线的描绘原理；及用计算机自行计算和直接绘制保护煤柱边界图的源程序，并举例说明其应用．更多还原

【Abstract】 To design the safety pillar for surface structures on condition that the ocurrence of coal seam had changed This can be done by means of minicomputer PB-700 instead of manually diagramming. This paper emphatically expounds for the: 1. determination method of the trevelling limit angle along the dip direction of coal seam, 2. drawing principle of the contour line of coal seam floor, 3. source program of evaluating and directly drawing up a plan with a computer by oneself. Also cited is an instance in illustration of their application.更多还原