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.
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。
These loci might be used as assistant markers for early selection in line breeding of ultra-fine wool sheep from Alpine type Chinese Merino.
部分位点可为中国美利奴高山型超细品系培育的早期选种提供辅助依据。
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