The feasibility of the protective coal pillar mining in the artificial inclined steep drift in the thick (ultra thick) coal seam of a large slope is discussed.
论证了急倾斜厚(特厚)煤层伪斜上山保护煤柱回收的可行性。
This paper offer the algebra ray method to preserve protective coal pillar.
本文采用代数射线法留设保护煤柱。
This paper offer the algebra ray method to preserve protective coal pillar.
本文采用代数射线法留设保护煤柱。
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