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；

youdao

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；

youdao