arch apex

基本解释

Comparing with depth-to-span ratio and height of the main arch, span is easier to influence the off-limits in the apex of arch.
总结出“拱顶处截面是影响拱顶脱落限值的最不利截面”的结论。
Finally, the coal-rock mass in the arch angle and apex is slided, and causes the distortion of local rock pressure, even induces dynamic hazards around working face.
拱角与拱顶煤岩滑落失稳，造成工作面局部压力畸变并诱发动力学灾害。
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This peculiar behaviour makes the magnetic arch apex rise higher and higher while the feet of magnetic loops remain nearly fixed, thus the closed magnetic arch system may eventually become open.
这导致磁弧顶越升越高而脚根基本上不朝外移动，这样闭合的磁弧将有可能逐渐变为开场。