The concrete construction methods and effects of mining technology in the middle thick coal seam are introduced.
介绍了中厚煤层回采工艺的具体施工方法和效果，同时介绍了工作面支护参数的计算。
The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.
西北地区中、下侏罗统煤层广布，厚度较大；
The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.
西北地区中、下侏罗统煤层广布，厚度较大；
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