顶柱是指一种安全矿柱。是由地下采场顶部的终止回采水平至上邻阶段的运输巷道底板之间，为安全而保留的那部分矿体。
根据失稳条件确定了顶柱的临界安全厚度。
The critical safety thickness of the top pillar has been confirmed according to the instability condition.
文中较详细地介绍了该顶柱回采的爆破设计。
The paper introduced the blasting design for recovery of the crown pillar in detail.
分析了动荷载振幅、频率对顶柱临界安全厚度的影响。
The influence of amplitude, frequency of dynamic loading on critical safety thickness of top pillar has been analyzed.
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