本文通过技术经济比较，对营城煤矿条件下，薄及中厚煤层群采区分层或分组的合理布置方式作了分析。用经济分析法确定了在这种条件下采区分组布置的合理界限。
Through the comparison of technical economy, this paper has analysed the proper layout of individual beds or separate groups for multiple seams of thin and medium thickness in the Ying Cheng Colliery.
在含其它结核的薄煤层、普通薄煤层以及中厚、厚煤层同样可以采用。
The invention can be used for mining low coal seams containing other concretions, ordinary low coal seams, medium-thickness coal seams and high coal seams.
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