老顶是指直接顶上部比较稳固的岩层。它的特点是,经过几次放顶后,达到一定暴露面积才冒落。如直接顶较薄,老顶在大冒落前会使工作面压力急剧增加,若管理不善,可将工作面压垮。对老顶应及时采取措施,以防事故发生。
... 特别是在企业有着广泛的应用 » Especially widely used in business 老顶 » The main roof 我会说一口流利的英语! » I can speak good English! ...
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老顶存在三种基本结构:类拱式、拱梁式和梁式。
The main roof has three basic structure forms: dynamic arch, arch-beam and beam.
由于悬露面积增大或老顶来压引起支承压力集中和转移。
Increased hanging area and weighting of main roof caused abutment stress concentration and stress transfer.
本文详细论述了采场老顶变形的时效特性及其粘弹性解。
The paper describes the time effect characteristics of main roof deformation and its viscoelastic solution.
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