Soft roof and floor of coal seam could be easily damaged while support was not timely and strength was not enough, so overall support was needed for laneway with strong support strength.
煤层顶底板极松软，若支护不及时、强度不够时极易破坏，需对巷道进行整体支护并具有较大的支护强度。
Soft roof and floor of coal seam could be easily damaged while support was not timely and strength was not enough, so overall support was needed for laneway with strong support strength.
煤层顶底板极松软，若支护不及时、强度不够时极易破坏，需对巷道进行整体支护并具有较大的支护强度。
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