The characteristics of damage, movement, evolution in mining coal bed in weathered zone were discussed mainly.
重点论述了风化带内煤层开采的覆岩破坏移动演化特征；
The reference heights of casing shoes are proposed with the evolution process of damage zone.
根据流变过程中围岩损伤区的演化过程，给出了套管鞋高度的参考值。
The reference heights of casing shoes are proposed with the evolution process of damage zone.
根据流变过程中围岩损伤区的演化过程，给出了套管鞋高度的参考值。
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