The factor that affect the well lane stability has primarily: Round the rock kind, well lane position, tunnel stalk line direction, cross section size, break rock method etc.
影响井巷稳定性的因素主要有:围岩性质、井巷位置、巷道轴线方向,断面尺寸,破岩方法等。
carbonado half hours are controlled first, fold to tea stalk can break, but the hand twists not broken nowadays carbonadoes.
初烘半小时左右,至茶叶折梗能断。但手捻不碎时下烘。
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