利用机动法确定了老顶岩板初次来压时载荷的上限值和塑铰线的位置，得到了顶板岩体关键层的最小破断跨距。
The loci of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived.
在大跨距条件下用悬链法计算了光缆的相对伸长量与增强层厚度的关系曲线。
The cross section areas of overhead optical cable reinforcing materical are calculated for a big span.
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