在矿山巷道掘进施工中，经常会遇到不良岩层，若处理不当，会导致巷道严重变形，甚至坍塌，使返修工作量增大。
Bad strata are often encountered in the process of drifting in mines, if improperly treated, they will lead to serious deformation of drift, even collapse, so as to increase the amount of repair work.
研究表明，考虑矿岩流变性的情况，采空区顶板岩层将随时间逐渐破坏直至坍塌。
The result indicates that the roof stratum supported by pillars in the mined-out area will gradually fail and till collapse by taking into account of the rheological feature of pillars.
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