The negative plastic hinge line in the plate was evaluated by using variational approach, then an equation for calculating the ultimate load carrying capacity was developed.
首先利用变分原理确定板的负塑性铰线方程，继而推导出极限承载力的表达式。
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。
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。
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