夹在其中的页岩层通常是塑性变形。
结果表明，随矿岩崩落开采，崩落区下方岩层出现较大范围的塑性破坏区和拉破坏区。
The results show that the great plastic yield areas and pull failure areas are formed in the base structure with caved area extends.
我国大部分油田套管损坏的原因主要是岩盐层、膏岩层、泥岩层等由于蠕变产生的塑性流动而挤坏套管的。
The main reason of casing failure in most oilfields is the plastic flow in salt rock, gypsolyte and shale due to creep.
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